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Lithuanian Journal of Physics最新文献

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Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure 评价冶金渣熔体结构的粘度活化能计算
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2023-04-06 DOI: 10.3952/physics.2023.63.1.6
D. Stepanenko
{"title":"Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure","authors":"D. Stepanenko","doi":"10.3952/physics.2023.63.1.6","DOIUrl":"https://doi.org/10.3952/physics.2023.63.1.6","url":null,"abstract":"Measurements of metallurgical slag viscosity were performed. The studied slags have been found to have close viscosity (η) values over a wide temperature range from 1453 to 1873 K. The results demonstrate that the viscosity decreases with the increase of CaO/SiO2 ratio. Temperature inflection points (T’) are found in the η = f(T) dependence, and they are consistent with the chemical composition of slags below 1453 K. The value of T’ increases with the increase of CaO/SiO2 ratio. The activation energy of viscosity Eη was calculated by using the Frenkel equation. With the increase of temperature, Eη decreases and does not depend on the chemical composition of slags. In the temperature region from 1473 to 1573 K, the temperature dependence of Eη = f(T) demonstrates energy deviations from the trend line indicating the relaxation of structurally sensitive bonds. The results obtained are of practical importance for the selection of rational slags for different metallurgical processes.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44583792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modelling the optical characteristics of cylindrical and rough nanowires with silver nanoparticles 用纳米银粒子模拟圆柱形和粗糙纳米线的光学特性
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2023-04-06 DOI: 10.3952/physics.2023.63.1.1
O. Havryliuk, O. Tkachuk, M. Terebinska, O. Semchuk, A. Biliuk
{"title":"Modelling the optical characteristics of cylindrical and rough nanowires with silver nanoparticles","authors":"O. Havryliuk, O. Tkachuk, M. Terebinska, O. Semchuk, A. Biliuk","doi":"10.3952/physics.2023.63.1.1","DOIUrl":"https://doi.org/10.3952/physics.2023.63.1.1","url":null,"abstract":"The optical spectra of structures with Ag nanoparticles between rough and cylindrical nanowires are calculated. The simulation was carried out using the finite-difference time-domain method (FDTD). As a source of radiation, a plane wave with the range of wavelengths 300–1000 nm is used. It is shown that with an increase in the root mean square (RMS) roughness of rough nanowires, the absorption coefficient decreases in the range of 500–750 nm due to an increase in the reflection effect. When silver nanoparticles are added, peaks appear at the wavelength of 840 nm (for cylindrical nanowires) and 900 nm (for rough nanowires), which indicates the manifestation of the surface plasmon resonance effect. It is shown that the electric field strength in a system with rough nanowires is higher than in a system with cylindrical nanowires.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44059692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrical properties of tin oxide based varistors with PbO addition in humid air 添加PbO的氧化锡基压敏电阻器在潮湿空气中的电性能
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2023-04-06 DOI: 10.3952/physics.2023.63.1.2
A. Gaponov, O. Abramova
{"title":"Electrical properties of tin oxide based varistors with PbO addition in humid air","authors":"A. Gaponov, O. Abramova","doi":"10.3952/physics.2023.63.1.2","DOIUrl":"https://doi.org/10.3952/physics.2023.63.1.2","url":null,"abstract":"In order to decrease the humidity sensitivity of SnO2–Co3O4–Nb2O5–Cr2O3 varistor ceramics, lead oxide was added and the electric characteristics of synthesized materials with the PbO concentration of 0, 0.1, 0.5, 0.7, 1 and 2 mol.% in the air with relative humidity of 10–86% were investigated. All tested samples have non-linear current–voltage characteristics with large values of the nonlinearity coefficient of 38–51. The optimal concentration of PbO addition in ceramics is 0.5–0.7 mol.%. The addition of such quantity of lead oxide to the ceramics leads to the decrease of the breakdown electric field up to 4390 V/cm and the humidity sensitivity coefficient up to 172. The increase of the PbO concentration provides the increase of the electrical conductivity of samples at low fields. The barrier mechanism of electrical conductivity of the studied ceramics is proved by the obtained values of potential barrier heights of 0.85–0.90 еV on the SnO2 crystallite boundaries.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46350036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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 low-dose-rate ionizing radiation on the complex dielectric permittivity of CdZnTe crystals 低剂量率电离辐射对CdZnTe晶体复介电常数的影响
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2023-04-06 DOI: 10.3952/physics.2023.63.1.5
O. Poluboiarov, O. Chugai, S. Oliinyk, D. Sliusar, S. Sulima
{"title":"Effect of low-dose-rate ionizing radiation on the complex dielectric permittivity of CdZnTe crystals","authors":"O. Poluboiarov, O. Chugai, S. Oliinyk, D. Sliusar, S. Sulima","doi":"10.3952/physics.2023.63.1.5","DOIUrl":"https://doi.org/10.3952/physics.2023.63.1.5","url":null,"abstract":"For the first time, the change in the real and imaginary parts of Cd1–xZnxTe crystals complex dielectric permittivity when exposed to ionizing radiation with a small exposure dose rate (about hundreds of μR/h) has been studied. Significant changes in the values of both parts of complex dielectric permittivity have been revealed. Regularities of specified changes have been established and explained taking into account a different radiation effect on free and bound charges. The basis of effect is the changes in the charge carrier localized states of point defect associates. Their appearance is due to a high concentration and a variety of intrinsic structural defects in the studied crystals as a consequence of the deviation of the crystal composition from the stoichiometric one.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42978273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contribution of ferroelectric and non-ferroelectric factors to P–E hysteresis loops of CuInP2S6-type single crystals 铁电和非铁电因素对cuinp2s6型单晶P-E磁滞回线的贡献
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4818
I. Zamaraite, A. Dziaugys, Y. Vysochanskii, J. Banys
{"title":"Contribution of ferroelectric and non-ferroelectric factors to P–E hysteresis loops of CuInP2S6-type single crystals","authors":"I. Zamaraite, A. Dziaugys, Y. Vysochanskii, J. Banys","doi":"10.3952/physics.v62i4.4818","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4818","url":null,"abstract":"A defining property of ferroelectricity is the switching between different states by the application of an electric field. Hysteresis loops serve like a fingerprint of ferroelectric materials giving some useful information. Sometimes the interpretation of information extracted from hysteresis measurements can be challenging due to the non-ferroelectric factors such as electrical conductivity, defect dipole presence and/or dielectric properties. In this paper, the ferroelectric and non-ferroelectric factors on P–E hysteresis loops were investigated in a CuInP2S6-type single crystal. The analysis of data obtained for this single crystal allowed extracting the reliable values in the materials with a low polarization and a high conductivity.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42513614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dielectric characterization of the BiFe0.5Cr0.5O3 ceramics BiFe0.5Cr0.5O3陶瓷的介电特性
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4815
E. Palaimiene, V. Gribauskaite, J. Banys, A. V. Pushkarev, Y. Radyush, N. M. Olekhnovich, J. Cardoso, A. Salak
{"title":"Dielectric characterization of the BiFe0.5Cr0.5O3 ceramics","authors":"E. Palaimiene, V. Gribauskaite, J. Banys, A. V. Pushkarev, Y. Radyush, N. M. Olekhnovich, J. Cardoso, A. Salak","doi":"10.3952/physics.v62i4.4815","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4815","url":null,"abstract":"Dielectric properties of the BiFe0.5Cr0.5O3 ceramics synthesized under high pressure were investigated in a broad frequency range (20 Hz – 1 GHz) between 200 and 500 K. It was revealed that the ceramics exhibit electrical conductivity above 300 K. Below 300 K, a dielectric dispersion caused by ferroelectric domains was observed. It was found that the conductivity follows the Almond–West law, which allowed us to determine a DC contribution (σDC). From the σDC values obtained at different temperatures, the activation energy (EA = 0.302 ± 0.006 eV) was calculated using the Arrhenius law.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47451466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solid-state NMR study of spin dynamics and local disorder in smart polymers: PDMAEMA 智能聚合物中自旋动力学和局部无序的固态核磁共振研究:PDMAEMA
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4821
V. Klimavičius, V. Klimkevicius, L. Dagys, K. Aidas, R. Makuška, V. Balevičius
{"title":"Solid-state NMR study of spin dynamics and local disorder in smart polymers: PDMAEMA","authors":"V. Klimavičius, V. Klimkevicius, L. Dagys, K. Aidas, R. Makuška, V. Balevičius","doi":"10.3952/physics.v62i4.4821","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4821","url":null,"abstract":"The solid-state 1H and 13C NMR spectra as well as the 1H–13C cross-polarization upon magic angle spinning (CP MAS) kinetics were studied for poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA), i.e. a smart pH- and thermo-responsive polymer. The stereochemical content of PDMAEMA was determined from the complex shaped 13C MAS signal of CH3 group. The kinetic data were processed using the Hirschinger and Raya spin dynamics model that includes the complete scheme of rotating frame spinlattice relaxation pathways. The general solution was adapted for the spin cluster treatment. The earlier studied experimental CP MAS kinetics data of poly [2-(methacryloyloxy)ethyl trimethylammonium chloride] (PMETAC), i.e. one of its quaternized form, were revisited and newly processed applying this model. The spin-lattice relaxation of protons in the rotating frame in PDMAEMA and PMETAC occurs in the same scale from one to tens of milliseconds. Very high anisotropy of spin-diffusion was found for both polymers. However, the local disorder of various spin sites in PDMAEMA is significantly higher than in PMETAC. It is characterized by the order parameters 0.71–0.77 and 0.87–0.91, respectively. The main chain in PDMAEMA is also more disordered and more flexible than in PMETAC.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46629254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Improvement of terahertz images by adaptive discrete cosine transform (DCT)-based denoising 基于自适应离散余弦变换(DCT)去噪的太赫兹图像改进
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4823
V. Abramova, S. Abramov, V. Lukin, I. Grigelionis, L. Minkevičius, G. Valušis
{"title":"Improvement of terahertz images by adaptive discrete cosine transform (DCT)-based denoising","authors":"V. Abramova, S. Abramov, V. Lukin, I. Grigelionis, L. Minkevičius, G. Valušis","doi":"10.3952/physics.v62i4.4823","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4823","url":null,"abstract":"Due to certain hardware limitations the quality of terahertz images is often lower than desired, which makes it difficult to extract valuable information from them. The goal of this paper is to investigate possibilities to overcome some of these limitations by means of digital image processing. The research is held on a set of images obtained at different distances from the source of terahertz radiation at 0.1 THz frequency. It is shown that the noise in these images is mixed and has a significant level of spatial correlation. For image quality enhancement a fully automatic denoising method based on the use of a discrete cosine transform with a spatially adapted spectrum is proposed. It is shown that despite an initially low spatial resolution of terahertz images and intensive noise, it provides a good noise reduction with a good preservation of edges, which allows one to noticeably improve the quality of these images and make them more convenient for visual analysis carried out by a human operator.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46231546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investigation of dielectric and magnetic properties of AL-800 ferrite AL-800铁氧体介电和磁性能的研究
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4824
S. Rudys, S. Balčiu̅nas, C. Vollinger, J. Banys, V. Kalendra
{"title":"Investigation of dielectric and magnetic properties of AL-800 ferrite","authors":"S. Rudys, S. Balčiu̅nas, C. Vollinger, J. Banys, V. Kalendra","doi":"10.3952/physics.v62i4.4824","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4824","url":null,"abstract":"Ferrites are usually used in accelerators for tuning radiofrequency (RF) cavities and in nonreciprocal devices controlling the power flow in RF accelerating systems. The conventional parallel‐biased Ni Zn ferrites employed for varying the frequency of accelerating cavities have the disadvantage of high saturation magnetization (4πMs). Application of the transversely biased yttrium iron garnet (YIG) material in RF tuners promises a significant reduction of power loss compared with systems that use the longitudinal bias. To inject the beam and extract the beam out of the CERN accelerator rings the fast kicker magnets made from ferrite materials must be used. Power deposition in the kicker magnets can be a limitation: if the temperature of the ferrite yoke exceeds the Curie temperature, the beam will not be properly deflected. Investigation of the ferrite electromagnetic properties of materials up to the GHz frequency range is essential for a correct impedance evaluation. This report summarizes an approach for deriving electromagnetic properties as a function of both frequency and temperature of the AL-800 garnet material. This information will be useful for simulating ferrite behaviour under realistic operating conditions.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47219286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phosphate bonded CoFe2O4–BaTiO3 layered structures: Dielectric relaxations and magnetoelectric coupling 磷酸键合CoFe2O4–BaTiO3层状结构：介电弛豫和磁电耦合
IF 0.6 4区 物理与天体物理
Lithuanian Journal of Physics Pub Date : 2022-12-10 DOI: 10.3952/physics.v62i4.4817
A. Plyushch, D. Lewin, P. Ažubalis, V. Kalendra, A. Sokal, R. Grigalaitis, V. Shvartsman, S. Salamon, H. Wende, A. Selskis, K. Lapko, D. Lupascu, J. Banys
{"title":"Phosphate bonded CoFe2O4–BaTiO3 layered structures: Dielectric relaxations and magnetoelectric coupling","authors":"A. Plyushch, D. Lewin, P. Ažubalis, V. Kalendra, A. Sokal, R. Grigalaitis, V. Shvartsman, S. Salamon, H. Wende, A. Selskis, K. Lapko, D. Lupascu, J. Banys","doi":"10.3952/physics.v62i4.4817","DOIUrl":"https://doi.org/10.3952/physics.v62i4.4817","url":null,"abstract":"Multilayered phosphate bonded CoFe2O4–BaTiO3–CoFe2O4 (CBC) and BaTiO3–CoFe2O4 – BaTiO3 (BCB) multiferroic structures were formed by means of uniaxial pressing. The dielectric properties were studied in 20 Hz – 1 GHz frequency and 120–500 K temperature ranges. The complex dielectric permittivity is 15–0.17i for CBC and 22–0.04i for BCB, it is temperature- and frequency-independent below 250 K. At higher temperatures, strong dispersion appeared governed by the Maxwell–Wagner relaxation. Such behaviour is determined by the 2–2 connectivity of the sample. The highest direct magnetoelectric coupling coefficient was found for the BaTiO3–CoFe2O4–BaTiO3 structure of 0.2 mVOe–1cm–1.","PeriodicalId":18144,"journal":{"name":"Lithuanian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44982026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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