Bulletin of the University of Karaganda-Physics最新文献

Formation of targets and investigation of Mn4Si7 coatings produced by magnetron sputtering 磁控溅射制备Mn4Si7靶材及镀层研究

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/50-57

B.D. Igamov, G.T. Imanova, A.I. Kamardin, I.R. Bekpulatov

{"title":"Formation of targets and investigation of Mn4Si7 coatings produced by magnetron sputtering","authors":"B.D. Igamov, G.T. Imanova, A.I. Kamardin, I.R. Bekpulatov","doi":"10.31489/2023ph3/50-57","DOIUrl":"https://doi.org/10.31489/2023ph3/50-57","url":null,"abstract":"The morphology, composition, electrical and optical properties of bulk samples and vacuum coatings of Mn4Si7 obtained by magnetron sputtering on a SiO2/Si structure were studied. It is shown that manganese silicide coatings with a thickness of about 150 nm are close in properties to bulk Mn4Si7, have a uniform finegrained structure of a semiconductor nature, which is characterized by thermal sensitivity up to 20-30 μV per degree. In addition, this article presents the electrophysical properties of high manganese silicide films produced by the authors by magnetron sputtering method. Heated films Mn4Si7 -146 nm coating has a uniform structure with fine grains, due to sufficient coating density. Since Mn4Si7 nanoclusters are semiconductor materials, it can be assumed that there will be energy barriers for charge carriers at the nanocluster–amorphous phase interface separating this phase. An increase in thermal sensitivity from 0 μV/K to 20 μV/K up to 800 K is explained by the disappearance of energy barriers for charge carriers at the nanocluster–amorphous phase interface due to the ordering of nanoclusters. The change from 20 µV/K to 28 µV/K upon cooling is explained by the appearance of structural relaxation in the amorphous phase.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083972","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

Analysis of aerodynamic characteristics of a two-bladed wind power plant containing combined power elements 双叶片组合动力元件风电场气动特性分析

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/143-150

A.Zh. Tleubergenova, A.N. Dyusembayeva, N.K. Tanasheva

{"title":"Analysis of aerodynamic characteristics of a two-bladed wind power plant containing combined power elements","authors":"A.Zh. Tleubergenova, A.N. Dyusembayeva, N.K. Tanasheva","doi":"10.31489/2023ph3/143-150","DOIUrl":"https://doi.org/10.31489/2023ph3/143-150","url":null,"abstract":"In this article, the aerodynamic characteristics of a wind turbine of various parameters are studied. For this purpose, an experimental two-cylinder model with fixed blades was made. A schematic diagram of a wind turbine with fixed blades and rotating cylinders is obtained. The airflow velocity varied from 3 to 12 m/s. The dependences of the aerodynamic forces of a wind power plant on the flow velocity were investigated. The analysis of the results of the experiment on changing the angle α of the fixed blade relative to the cylinder from the airflow velocity of the wind turbine is carried out. When the position of the blade changes, the drag changes relative to the airflow. A graph is constructed based on the dependence of drag and lift forces on the flow velocity. It is established that at the maximum angle relative to the cylinder α = 30° that the value of the lifting force and the drag force of the fixed blade is higher. From the dependence of the coefficient of lift and drag force on the Reynolds number, it was found that at an angle of 30° degrees, there is a minimum lifting force of 0.04 and a maximum drag force of 1.479 at Re=1·104 . The results of the experiment show that it is possible to use an additional force driven by the Magnus effect that occurs when rotating cylinders with a horizontal axis. These results are considered useful for us in practice since these results can be used in combined wind engines operating at low wind speeds. This wind power plant can generate electricity starting from a wind speed of 2.8 m/s.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083977","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

Recent Update on Perovskite/Organic Tandem Solar Cells 钙钛矿/有机串联太阳能电池的最新进展

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/6-15

T. Serikova, G. Bizhanova, Annie Ng, Hanlin Hu

{"title":"Recent Update on Perovskite/Organic Tandem Solar Cells","authors":"T. Serikova, G. Bizhanova, Annie Ng, Hanlin Hu","doi":"10.31489/2023ph3/6-15","DOIUrl":"https://doi.org/10.31489/2023ph3/6-15","url":null,"abstract":"The emergence of multiple-junction photovoltaics (PVs) has presented a remarkable opportunity to overcome the Shockley-Queisser limit of single-junction solar cells. Recently, perovskite solar cells (PSCs) and organic photovoltaics (OPVs) are two of the most promising new-generation PVs, which have gained widespread attention in the PV community due to their exceptional rapid growth in their power conversion efficiencies (PCEs). Combining PSCs and OPVs in tandem structures offers numerous advantages, such as the ability to tune the bandgap of absorbers to regulate the absorption bands and enhance transparency. The use of thin-film technology ensures that the devices are lightweight and flexible, which is particularly advantageous for certain applications. Furthermore, both PSCs and OPVs are low-cost, making them attractive for large-scale deployment in the future. These advantages will make PSC/OPV tandem devices promising for applications beyond traditional silicon-based PVs. This review provides an up-to-date account on the recent progress of PSC/OPV tandem PVs. The state-of-the-art fabrication techniques and material engineering on the properties of PSC and OPV sub cells as well as their functional layers are discussed. A perspective guidance is also given to direct the future development of this type of tandem PVs. This paper provides an insight into the development of PSC/OPV tandem PVs, providing researchers with a roadmap to advance this technology further and unlock its full potential in the field of renewable energy.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135084466","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

Effects of conditions on thе synthesis and properties of Bi-2234 HTSC ceramic produced from the melt 熔体制备Bi-2234 HTSC陶瓷的工艺条件及其性能的影响

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/163-170

D.E. Uskenbaev, A.S. Nogai, A.D. Uskenbaev, E.A. Nogai

引用次数: 0

The effect of the CH3NH3PbClxI3-x perovskite layer thickness and grain size on its electrophysical and optical properties CH3NH3PbClxI3-x钙钛矿层厚度和晶粒尺寸对其电物理和光学性能的影响

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/107-118

T.M. Mukametkali, X.S. Rozhkova, A.K. Aimukhanov, K. Apshe, A.K. Zeinidenov, B.R. Ilyassov

{"title":"The effect of the CH3NH3PbClxI3-x perovskite layer thickness and grain size on its electrophysical and optical properties","authors":"T.M. Mukametkali, X.S. Rozhkova, A.K. Aimukhanov, K. Apshe, A.K. Zeinidenov, B.R. Ilyassov","doi":"10.31489/2023ph3/107-118","DOIUrl":"https://doi.org/10.31489/2023ph3/107-118","url":null,"abstract":"Lead halide perovskite CH3NH3PbClx I3-x thin films are widely used as photoactive layers in perovskite solar cells. CH3NH3PbClx I3-x is a low band gap semiconductor with a broad absorption spectrum and a high conductivity showing excellent compatibility with exciting hole and electron selective layers in terms of electronic energy alignment, which provide efficient charge generation, separation and transport in perovskite solar cells. In this paper, CH3NH3PbClx I3-x layers were deposited on the TiO2 surface by one step spin-coating technique from a methylammonium iodide (MAI) and lead chloride (PbCl2 ) solution. To prepare the perovskite solution, PbCl2 (Sigma-Aldrich)230 mg of PbCl2 and 394 mg of MAI were dissolved in 1 ml of N, N-Dimethylformamide (Sigma-Aldrich) solvent. As expected, the elevation of the spin-coating rate resulted in CH3NH3PbClx I3-x thickness reduction, which should lead to a decrease in the R3 resistance in CH3NH3PbClx I3-x. However, the impedance spectroscopy revealed that with thickness reduction from 955 nm to 753 nm, the R3 resistance of CH3NH3PbClx I3-x declines from about 2590 Ώ to 2258 Ώ reaching the minimum value at 505 nm. The further decrease in CH3NH3PbClx I3-x thickness increased CH3NH3PbClx I3-x film resistance. The study of CH3NH3PbClx I3-x absorbance and luminescence spectra showed that the change in CH3NH3PbClx I3-x defect density occurred, which explains the decrease in CH3NH3PbClx I3-x resistance. According to the absorbance and luminescence spectroscopy study, the CH3NH3PbClx I3-x thickness reduction led to a decrease in the density of interstitial CH3NH3PbClx I3-x + defects. CH3NH3PbClx I3-x + species form deep levels trapping free electrons and as a result, increasing CH3NH3PbClx I3-x resistance. The PSCs based on a 505 nm thick CH3NH3PbClx I3-x layer showed the highest performance with the improved short current density and fill factor. The champion device had a power conversion efficiency of 9.92 %.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135084129","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

Features of hole transport and density of localized states in CuCr1-xMgxO2 and CuCr1–yMgyO2/(MgCr2O4)x–y polycrystalline ceramics CuCr1-xMgxO2和CuCr1-yMgyO2 /(MgCr2O4) x-y多晶陶瓷的空穴输运特征和局域态密度

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/34-39

V.G. Kytin, E.E. Kupriyanov, A. Apreleva, V.A. Kulbachinskii, I.E. Korsakov, T.Yu. Kiseleva, Zh.T. Ismailov

引用次数: 0

Analysis of the problems of synthesis of new nanocrystalline chalcogenide materials for thermoelectric generators and sodium-ion batteries 热电发电机和钠离子电池用新型纳米晶硫化物材料的合成问题分析

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/98-106

M.M. Kubenova, K.A. Kuterbekov, K.Zh. Bekmyrza, A.M. Kabyshev, Sh. Afroze, R.Sh. Palymbetov

{"title":"Analysis of the problems of synthesis of new nanocrystalline chalcogenide materials for thermoelectric generators and sodium-ion batteries","authors":"M.M. Kubenova, K.A. Kuterbekov, K.Zh. Bekmyrza, A.M. Kabyshev, Sh. Afroze, R.Sh. Palymbetov","doi":"10.31489/2023ph3/98-106","DOIUrl":"https://doi.org/10.31489/2023ph3/98-106","url":null,"abstract":"The paper analyzes the problems of the synthesis of new nanocrystalline chalcogenide materials for thermoelectric generators and sodium-ion batteries. The objectives of the synthesis will determine the best method to use to create chalcogenide materials for electrodes in real-world applications. The method of direct solid-phase reaction in a vacuum or in an environment of pure inert gas is the most effective way to generate novel chalcogenide materials in tiny amounts for the investigation of physicochemical and other features.With this approach, which is more dependable, it is feasible to produce a pure result free of contaminants that are inescapable when working with other solvents and precursors. Additionally, in a consistent synthesis regime, it is differentiated by the stability of the acquired attributes of the compounds. Synthesis modes, reagents, and post-processing depend on the specific material. The method of synthesizing alloys in a melt media made up of a combination of potassium and sodium hydroxides is one of the key techniques employed in the present research. The melting point drops to 165 °C at a certain ratio of the concentrations of these hydroxides, allowing for the execution of salt exchange processes in the melt. The size of the resultant chalcogenide particles can be reduced to a few nanometers by lowering the synthesis temperature, adding water, and shortening the annealing period.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127443","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

Review of the current state of technology for capacitive deionization of aqueous salt solutions 盐水溶液电容性去离子技术现状综述

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/16-33

A. Zakharov, A. Tukesheva, V. Pavlenko, Syed Fahad Bin Haque, John Ferraris, A. Zakhidov, T. Tazhibayeva, T. Bazarbayeva

{"title":"Review of the current state of technology for capacitive deionization of aqueous salt solutions","authors":"A. Zakharov, A. Tukesheva, V. Pavlenko, Syed Fahad Bin Haque, John Ferraris, A. Zakhidov, T. Tazhibayeva, T. Bazarbayeva","doi":"10.31489/2023ph3/16-33","DOIUrl":"https://doi.org/10.31489/2023ph3/16-33","url":null,"abstract":"The availability of clean water at affordable prices is one of the key technological, social, and economic challenges of the 21st century. The increased extraction of groundwater worldwide is leading to the gradual intrusion of salty water into sources and water horizons. In order to use this water for industrial and agricultural purposes, or as drinking water, it needs to be purified and desalinated. Thus, methods of desalinating water of different salinity levels, ranging from brackish to seawater, are becoming more prominent. The overall goal of current research is to make water desalination technologies more energyefficient and cost-effective. One promising technology that meets these requirements is capacitive deionization (CDI) of water. This technology has been widely known for over 30 years, but significant progress in CDI research has only been achieved in recent years. In this review, we examine the currently developed architectures of CDI cells, advancements in carbon materials, and discuss the prospects and challenges of commercializing this technology.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083970","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 changes in phase composition and tribological properties of 65G steel during electrolyte-plasma hardening 电解等离子体硬化过程中65G钢相组成及摩擦学性能变化的研究

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/119-127

B.K. Rakhadilov, L.B. Bayatanova, Z.A. Satbayeva, R.S. Kozhanova, R.Ye. Sakenova, G.U. Yerbolatova

引用次数: 0

Structure and tribological properties of detonation coatings based on Cr3C2-NiCr after pulse-plasmaine treatment 脉冲浆胺处理后Cr3C2-NiCr爆轰涂层的结构与摩擦学性能

Bulletin of the University of Karaganda-Physics Pub Date : 2023-09-30 DOI: 10.31489/2023ph3/40-49

B.K. Rakhadilov

引用次数: 0