Bulletin of the University of Karaganda-Physics最新文献_第4页

Indicatrix of TE and TM- polarized wave velocities in crystal of classes 4mm, 3m, 6mm with magneto-electric effect 具有磁电效应的4mm、3m、6mm级晶体中TE和TM偏振波速度的指示线

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/23-30

S. Tleukenov, Zh. N. Suierkulova, S. Nurkenov

{"title":"Indicatrix of TE and TM- polarized wave velocities in crystal of classes 4mm, 3m, 6mm with magneto-electric effect","authors":"S. Tleukenov, Zh. N. Suierkulova, S. Nurkenov","doi":"10.31489/2023ph1/23-30","DOIUrl":"https://doi.org/10.31489/2023ph1/23-30","url":null,"abstract":"This work is devoted to the theoretical study of the laws of propagation of electromagnetic waves of TE and TM polarization in anisotropic media belonging to classes 4mm, 3m, 6mm, etc. having a magnetoelectric effect. The directions of the vectors of the phase and group velocities of the polarization waves TE and TM at the boundary of a uniaxial crystal with magnetoelectric properties are considered. In the analytical form, the values of the directions of the phase and group velocities of the TE and TM waves are indicated, depending on the direction of the wave vector of the incident wave. The consequences of the obtained results for uniaxial crystals in the absence of magnetoelectric properties are discussed. The solution of the tasks set in this paper is based on the use of the matrix method. On its basis, various problems of wave processes in an isotropic elastic medium, electromagnetic waves in crystals, the distribution of coupled elastic and electromagnetic waves in piezoelectric and piezomagnetic media with a magnetoelectric effect were previously considered. In the presence of a magnetoelectric effect for electromagnetic waves propagating through uniaxial crystals, the parameters of the wave vector, phase and group velocities are determined. The obtained results are analyzed for electromagnetic waves propagating through uniaxial crystals in the absence of a magnetoelectric effect. The indicatrices of the wave vectors propagating in the plane and the phase velocities of the TM polarization waves are limited ( 0 ) x z . Based on the Rayleigh equation, the values of the group velocity are obtained. The density of electromagnetic energy fluxes and their components are determined for TE and TM waves. The energy transfer rate and its direction are determined. It is shown that the group velocities and directions obtained from the Rayleigh equation and the Umov-Poynting vector do not coincide.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42144296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study of evolution of structured flows at boundary of the regime change “diffusion — concentration convection” in isothermal multicomponent mixing in gases by techniques of visual and numerical analysis 用目视和数值分析技术对比研究等温多组分气体混合过程中“扩散-浓对流”边界结构流演化

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/49-58

V. Kossov, S. Krasikov, M. Zhaneli, S. Belov, O. Fedorenko

{"title":"Comparative study of evolution of structured flows at boundary of the regime change “diffusion — concentration convection” in isothermal multicomponent mixing in gases by techniques of visual and numerical analysis","authors":"V. Kossov, S. Krasikov, M. Zhaneli, S. Belov, O. Fedorenko","doi":"10.31489/2023ph1/49-58","DOIUrl":"https://doi.org/10.31489/2023ph1/49-58","url":null,"abstract":"During isothermal multicomponent diffusion process, the number of effects appear that are not observed visually when mixed in binary mixtures. These include occurrence of convective instability with subsequent formation of structured flows. The feature of this type of mixing is that convection is realized under conditions of decrease in density of mixture with height. Flow visualization method allows to fix information about distribution of medium parameters by dynamics of structures in convective flows. Application of computer processing methods, as well as techniques of identifying images of thermophysical fields, allows to obtain quantitative information about convective flows. For an isothermal ternary gas mixture heliumargonnitrogen, shadow images of structural formations formed in convective flows due to the instability of mechanical equilibrium are represented in this work. To carry out digital analysis of experimental shadow images, a simplified virtual model of the lower chamber of the diffusion cell was created. Based on digital analysis of visual images, quantitative characteristics related to estimation of the size of convective formations, period of their formation, and linear velocity of convection cells when moving through diffusion channel are presented. It has been established that the growing convective disturbances arising in the system cause a change in the characteristic scale of convective cells. The analysis of shadow images also showed that a vortex is formed in convective flows, which consists mainly of a component with the highest molecular weight. Comparison of visual images of experimental fields with simulation flows is implemented, on the basis of which composition of mixture components in convective structures is estimated. It is shown that the obtained value of the concentration of the heavy component in the vortex filament can be taken as the minimum.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47857544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical modeling and calculation of heat transfer between heat carriers in heat exchangers 换热器中热载体间传热的数值模拟与计算

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/59-70

D. Kurmanova, N. Jaichibekov, А.G. Karpenko, К.N. Volkov

{"title":"Numerical modeling and calculation of heat transfer between heat carriers in heat exchangers","authors":"D. Kurmanova, N. Jaichibekov, А.G. Karpenko, К.N. Volkov","doi":"10.31489/2023ph1/59-70","DOIUrl":"https://doi.org/10.31489/2023ph1/59-70","url":null,"abstract":"Heating of oil and oil products is widely used to reduce energy loss during transportation. An approach is being developed to determine the effective length of the heat exchanger and the temperature of the cold heat carrier at its outlet in the case of a strong dependence of oil viscosity on temperature. The oil of the Uzen field (Kazakhstan) is considered as a heated heat carrier, and water is considered as a heating component. The method of the average-logarithmic temperature difference, modified for the case of variable viscosity, and methods of computational fluid dynamics are used for calculations. The results of numerical calculations are compared with the data obtained on the basis of a theoretical approach at constant viscosity. When using a theoretical approach with constant or variable viscosity, the heat transfer coefficients to cold and hot heat carriers are found using criterion dependencies. In the case of variable oil viscosity, the transition of the laminar flow regime to the turbulent one is manifested, which has a significant effect on the effective length of the heat exchanger. To solve this problem comprehensively, a mathematical model of hydrodynamics and heat transfer of heat carriers has been developed and multiparametric numerical calculations have been performed using the “Ansys Fluent” software package.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44945427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of Aerodynamic Characteristics of a Two-Bladed Sailing Wind Turbine 双叶片帆船风力机气动特性研究

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/42-48

A. Tleubergenova, N. Tanasheva, K. Shaimerdenova, N. Botpaev, S.B. Kassiyev, L. Minkov

{"title":"Investigation of Aerodynamic Characteristics of a Two-Bladed Sailing Wind Turbine","authors":"A. Tleubergenova, N. Tanasheva, K. Shaimerdenova, N. Botpaev, S.B. Kassiyev, L. Minkov","doi":"10.31489/2023ph1/42-48","DOIUrl":"https://doi.org/10.31489/2023ph1/42-48","url":null,"abstract":"The article examines a prototype of a wind turbine with two blades. For experimental work, a mock-up of a sailing wind turbine consisting of two blades was developed. The material of the sail blades was selected according to elasticity and lightness, cheapness, roughness of the streamlined surfaces. The study shows the aerodynamic parameters acting on the blade. The air flow velocity varied from 3 to 12 m/s. The dependence of the lifting force and the frontal barrier on the air flow velocity was obtained by turning the blades of the wind turbine so that the angle of attack was α = 00, 150, 300, 450, 600. It is established that when the position of the blade’s changes, the lifting force and the drag force decrease. With an increase in the angle of attack α > 00 leads to a decrease in the midsection of the wind wheel with respect to the air flow. On this basis, there is a decrease in aerodynamic forces. As the speed of the air treacle increases, the speed of rotation of the wind wheel also increases. However, during the experiment it was found that the location of the blades at different angles affects the numerical value of the rotational speed. According to the conducted experiments, several values were obtained. The analysis of the obtained values is carried out. A graph is constructed based on the dependence of the wind wheel rotation frequency on the wind speed with a change in the angle of attack. A wind turbine with blades with a variable angle of attack, which, turning, gradually become more parallel to the direction of the wind. Centrifugal forces regulate the inclination of the blades, and as a result, the speed of rotation of the wind wheel, and keep the wind generator at the nominal speed of rotation.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45280863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of WS2 nanoparticles on the current-voltage characteristics of a polymer solar cell WS2纳米粒子对聚合物太阳能电池电流-电压特性的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/13-22

X. Rozhkova, А.К. Aimukhanov, A. Tussupbekova, А.К. Zeinidenov, A. Zhakanova, А.М. Alexeev

{"title":"Effect of WS2 nanoparticles on the current-voltage characteristics of a polymer solar cell","authors":"X. Rozhkova, А.К. Aimukhanov, A. Tussupbekova, А.К. Zeinidenov, A. Zhakanova, А.М. Alexeev","doi":"10.31489/2023ph1/13-22","DOIUrl":"https://doi.org/10.31489/2023ph1/13-22","url":null,"abstract":"The paper presents the results of studies of the effect of tungsten disulfide nanoparticles on the optical and electrotransport characteristics of PEDOT: PSS thin films in polymer solar cells. Tungsten disulfide (WS2) nanoparticles were obtained by laser ablation in isopropyl alcohol. The average size of nanoparticles were determined by dynamic light scattering and is ~38 nm. The concentration of WS2 nanoparticles in the solution was calculated based on the density of the WS2 substance. The absorption spectrum of nanoparticles in isopropyl alcohol has been measured. Two bands are observed in 500-900 nm regions, which are associated with direct exciton transitions A1 and B1 in two-dimensional transition metal dichalcogenides with 2H phase. WS2 nanoparticles were added in PEDOT: PSS solution and thin films were deposited from the prepared solution by spin-coating. PEDOT: PSS thin films doped with WS2 were studied by atomic force microscopy (AFM). The arithmetic mean deviation of the surface roughness (Ra) was estimated. Doping with WS2 nanoparticles leads to the increase in Ra of PEDOT: PSS thin films. The optical absorption spectra of doped films have been measured. Also, doping PEDOT: PSS with WS2 nanoparticles results in a long-wavelength shift of the PEDOT absorption maximum. The optimal concentration of WS2 nanoparticles for the preparation of doped PEDOT: PSS thin films is determined, at which the film resistance decreases by almost 2 times, the recombination resistance of charge carriers increases by 4.7 times, and the efficiency of the polymer solar cell increases to 1.94 %.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46991433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mitigation of the effect of variations in the electrical conductivity of the material via two-frequency eddy current testing of the thickness of the electrically conductive wall under significantly varying influence parameters 在显著变化的影响参数下，通过对导电壁厚度进行双频涡流检测，减轻材料导电性变化的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/71-79

A.E. Goldshteyn, Kh.Kh. Abakumov

{"title":"Mitigation of the effect of variations in the electrical conductivity of the material via two-frequency eddy current testing of the thickness of the electrically conductive wall under significantly varying influence parameters","authors":"A.E. Goldshteyn, Kh.Kh. Abakumov","doi":"10.31489/2023ph1/71-79","DOIUrl":"https://doi.org/10.31489/2023ph1/71-79","url":null,"abstract":"The paper analyzes feasibility of the two-frequency eddy current method for measuring the thickness of an electrically conductive wall under significantly varying test and influence parameters of the test object — the lift-off between the eddy current probe and the test object surface, and the electrical conductivity of the material. An analytical solution was used to determine the dependence of the two-frequency signal of the surface eddy current probe on the influence parameters of the test object. The informative parameters used to simultaneously mitigate the effect of the two influence parameters were the amplitude of the added high-frequency voltage to determine the lift-off, the phase of the added low-frequency voltage to determine the wall thickness, and the phase of the added high-frequency voltage to suppress variations in the electrical conductivity of the material. The calculated dependences of the informative parameters on the test and influence parameters were analyzed. The use of nonlinear functions of the inverse transformation of the informative parameter into the test parameter was shown to efficiently mitigate the effect of variations in the lift-off on measurement results. A method to suppress variations in the electrical conductivity of the test object material is proposed. It implies the correction of the phase of the added low-frequency voltage by the correction value calculated from the parameters of the lift-off and wall thickness, and high-frequency phase variation caused by varying the electrical conductivity of the material.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47716811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonstandard analysis in electrical engineering. The analysis of the direct current circles with ideal reactive elements 电气工程中的非标准分析。具有理想无功元件的直流环的分析

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/31-41

S. Katsyv, V. Kukharchuk, V. Kucheruk, P. Kulakov, M. Gribov

{"title":"Nonstandard analysis in electrical engineering. The analysis of the direct current circles with ideal reactive elements","authors":"S. Katsyv, V. Kukharchuk, V. Kucheruk, P. Kulakov, M. Gribov","doi":"10.31489/2023ph1/31-41","DOIUrl":"https://doi.org/10.31489/2023ph1/31-41","url":null,"abstract":"The article proposes the use of ideas and methods of non-standard analysis in the field of theoretical electronics. The article shows that the analysis of DC circuits, including ideal inductances and capacitances, by standard methods of theoretical electrical engineering is too complicated or almost impossible. To solve this problem, it is proposed to extend the methods of non-standard analysis by the tasks of analyzing electrical circuits with ideal reactive elements. The authors have defined a class of non-standard electrotechnical problems aimed at the analysis of DC electrical circuits, including ideal reactive elements — ideal inductances and capacitances. It is shown that the solution of the selected class of problems by standard methods of theoretical electrical engineering is too difficult or almost impossible. It is proposed to extend the methods of non-standard analysis by the tasks of analyzing electrical circuits with ideal reactive elements. The obtained advantages of this approach are confirmed by examples of calculations of electrical circuits with inductances and capacitances, as well as magnetic circuits.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42490443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical foundations of the construction of the operation of heat flow devices 热流装置运行结构的理论基础

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/80-87

P. Kissabekova, D. Karabekova, A. Khassenov, A. S. Kudussov, Sh.S. Kyzdarbekova, V. Kucheruk

{"title":"Theoretical foundations of the construction of the operation of heat flow devices","authors":"P. Kissabekova, D. Karabekova, A. Khassenov, A. S. Kudussov, Sh.S. Kyzdarbekova, V. Kucheruk","doi":"10.31489/2023ph1/80-87","DOIUrl":"https://doi.org/10.31489/2023ph1/80-87","url":null,"abstract":"Numerous studies show that non-destructive testing methods satisfy most of the requirements of technical diagnostics of heating networks and technological facilities. Methods of non-destructive testing are based on the observation and automated registration of the temperature state of processes. The developed device is designed to analyze the state of thermal insulation of underground pipelines. The development and research of devices for measuring heat flow requires mandatory consideration of the temperature field of the sensing element, i.e. solutions of the differential equation of thermal conductivity for a body of a certain shape under given boundary conditions. In general, the sensing elements are multi-layered: black coating, calorimetric load, heat-sensitive elements, alternating lacquer and adhesive layers, i.e., the sensing elements are heterogeneous, both in the direction perpendicular to the irradiated surface and in parallel. The heterogeneity in the first case is due to the multi-layering of the sensing element. The article describes solutions to the thermal conductivity equation describing the temperature field of a sensitive element in the form of a hemisphere and a spherical zone, due to the nonequivalence of heat losses during irradiation and calibration by electric current. Taking into account this systematic error makes it possible to increase the accuracy of measuring the energy parameters of radiation. These solutions of the equations formed the basis of the design of the device for measuring heat flow.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42958141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Silver Nanoparticles on the Optoelectronic Properties of Graphene Oxide Films 纳米银对氧化石墨烯薄膜光电性能的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2023-03-30 DOI: 10.31489/2023ph1/6-12

E. Alikhaidarova, E. Seliverstova, N. Ibrayev

{"title":"Effect of Silver Nanoparticles on the Optoelectronic Properties of Graphene Oxide Films","authors":"E. Alikhaidarova, E. Seliverstova, N. Ibrayev","doi":"10.31489/2023ph1/6-12","DOIUrl":"https://doi.org/10.31489/2023ph1/6-12","url":null,"abstract":"The effect of Ag nanoparticles (NPs) on the optical and optoelectronic properties of films based on graphene oxide has been studied. In the presence of Ag NPs, the morphology, as well as the thickness of graphene oxide films, were not changed. When Ag NPs were added, a change in the shape and position of the absorption bands and Raman spectra of graphene oxide was observed. It is shown that with the addition of Ag NPs, the G band of graphene oxide shifts to low frequencies, which may be the result of the absence of separate double bonds, while the ID/IG ratio was not changed, as did the number of Gr layers. In the absorption spectrum of the films, along with the absorption band of graphene oxide, a shoulder was registered, which can be associated with the absorption of Ag NPs. The optical density of Gr films with plasmonic NPs is higher than without them. Measurements of the optoelectronic characteristics showed that, in the presence of Ag NPs, an increase in the values of the photocurrent of graphene oxide is observed. The sensitivity of graphene oxide films was increased by almost 20 times when plasmonic NPs were added to them, and the detection ability increased by 25 times. The results obtained can be used in the development of new photosensitive devices for optoelectronic and photocatalytic applications.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41642866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Characteristics of Materials with the Ruddlesden-Popper Structure for Solid Oxide Fuel Cells 固体氧化物燃料电池用Ruddlesden Popper结构材料特性的研究

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-12-30 DOI: 10.31489/2022ph4/32-47

K. Kuterbekov, K. Bekmyrza, A. Kabyshev, M. Kubenova, N. Aidarbekov, S. Nurkenov

{"title":"Investigation of the Characteristics of Materials with the Ruddlesden-Popper Structure for Solid Oxide Fuel Cells","authors":"K. Kuterbekov, K. Bekmyrza, A. Kabyshev, M. Kubenova, N. Aidarbekov, S. Nurkenov","doi":"10.31489/2022ph4/32-47","DOIUrl":"https://doi.org/10.31489/2022ph4/32-47","url":null,"abstract":"This article presents the results of a study of the characteristics of materials based on lanthanum nickelate La2Ni1-xCoxO4+δ (0≤x≤0.3) and Pr2NiO4+δ. Their crystal structure and interaction with YSZ and GDC electrolyte materials at 900 °C are analyzed. The thermal expansion coefficients are determined and the temperature dependences of the conductivities are studied. The polarization resistance of these materials in contact with the electrolyte material YSZ is also measured. As a result of the study, the following cathode materials were investigated: La2Ni1-xCoxO4 (0≤ x ≤0.3), Pr2NiO4. In this case, the influence of low concentrations of Co on the characteristics of lanthanum nickelate was studied for the first time. Materials based on lanthanum nickelate and praseodymium nickelate were characterized by a structure of the K2NiF4 type (RuddlesdenPopper phases) with rhombic symmetry. A study of the thermal expansion of cathode materials showed that all the studied materials are characterized by higher CTEs than YSZ and GDC electrolytes. Based on the studies performed, cathode materials were chosen for the formation of composites with GDC electrolyte: La2NiO4, La2Ni0.8Co0.2O4, Pr2NiO4. A study of the sintering kinetics and CTE of composites showed that their thermal characteristics are much closer to those of electrolytes than those of pure cathode materials.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47723766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1