Pub Date : 2024-06-06DOI: 10.1134/s1063774524600145
A. V. Petrov, Q. Ji, I. V. Murin, A. K. Ivanov-Schitz
Abstract
The structural and transport features of the behavior of the fluorine ion sublattice of Pb0.78Sr0.19K0.03F1.97 solid solution have been studied by the ab initio molecular dynamics method. It is shown that the local diffusion of fluorine anions changes with the nature of dopant atom, which is consistent with the experimental transport characteristics.
{"title":"Ab Initio Molecular Dynamics Simulation of the Superionic State in Pb0.78Sr0.19K0.03F1.97 Solid Solution: Behavioral Features of the Fluorine Ion Sublattice","authors":"A. V. Petrov, Q. Ji, I. V. Murin, A. K. Ivanov-Schitz","doi":"10.1134/s1063774524600145","DOIUrl":"https://doi.org/10.1134/s1063774524600145","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The structural and transport features of the behavior of the fluorine ion sublattice of Pb<sub>0.78</sub>Sr<sub>0.19</sub>K<sub>0.03</sub>F<sub>1.97</sub> solid solution have been studied by the ab initio molecular dynamics method. It is shown that the local diffusion of fluorine anions changes with the nature of dopant atom, which is consistent with the experimental transport characteristics.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600108
A. A. Kulishov, G. A. Yurasik, M. S. Lyasnikova, A. S. Lesnikov, V. A. Postnikov
Abstract
The results of studying the crystallization of anthracene, tetracene, and pentacene under conditions of physical vapor transport in growth systems with one- and two-zone thermal fields are presented. Specific features of the phase behavior and thermal stability of compounds have been investigated by differential-scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in order to find the thermal modes of sublimation of materials providing crystal growth without any damage due to chemical degradation. Conditions for growing crystals on the centimeter scale (0.2–2 cm) are determined for growth systems with one- and two-zone thermal fields. A series of field-effect transistors with upper drain/source electrodes and upper gate were fabricated based on grown pentacene crystals, and their electrical characteristics were investigated.
{"title":"Crystals of Linear Acenes: Features of Vapor Phase Growth and Some Properties","authors":"A. A. Kulishov, G. A. Yurasik, M. S. Lyasnikova, A. S. Lesnikov, V. A. Postnikov","doi":"10.1134/s1063774524600108","DOIUrl":"https://doi.org/10.1134/s1063774524600108","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of studying the crystallization of anthracene, tetracene, and pentacene under conditions of physical vapor transport in growth systems with one- and two-zone thermal fields are presented. Specific features of the phase behavior and thermal stability of compounds have been investigated by differential-scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in order to find the thermal modes of sublimation of materials providing crystal growth without any damage due to chemical degradation. Conditions for growing crystals on the centimeter scale (0.2–2 cm) are determined for growth systems with one- and two-zone thermal fields. A series of field-effect transistors with upper drain/source electrodes and upper gate were fabricated based on grown pentacene crystals, and their electrical characteristics were investigated.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600066
V. L. Manomenova, E. B. Rudneva, N. A. Vasilyeva, N. I. Sorokina, V. A. Komornikov, D. S. Matveeva, M. S. Lyasnikova, V. V. Grebenev, S. I. Kovalev, A. E. Voloshin
Abstract
The results of the studies performed at the Shubnikov Institute of Crystallography and devoted to the development of UV optical filters based on complex nickel and cobalt compounds are reviewed. The structural dependence of the optical properties of these crystals and their thermal stability is discussed. The fundamental features of mixed crystals grown from solution and developed approaches to the design of optical filters based on structurally perfect mixed K2(Co,Ni)(SO4)2⋅6H2O crystals are described. The possibility of designing UV-А optical filters by partial substitution of the ligand environment of transition metal ions is demonstrated.
{"title":"Crystals of Salts of Nickel and Cobalt Transition Elements for Optical Filters","authors":"V. L. Manomenova, E. B. Rudneva, N. A. Vasilyeva, N. I. Sorokina, V. A. Komornikov, D. S. Matveeva, M. S. Lyasnikova, V. V. Grebenev, S. I. Kovalev, A. E. Voloshin","doi":"10.1134/s1063774524600066","DOIUrl":"https://doi.org/10.1134/s1063774524600066","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the studies performed at the Shubnikov Institute of Crystallography and devoted to the development of UV optical filters based on complex nickel and cobalt compounds are reviewed. The structural dependence of the optical properties of these crystals and their thermal stability is discussed. The fundamental features of mixed crystals grown from solution and developed approaches to the design of optical filters based on structurally perfect mixed K<sub>2</sub>(Co,Ni)(SO<sub>4</sub>)<sub>2</sub>⋅6H<sub>2</sub>O crystals are described. The possibility of designing UV-<i>А</i> optical filters by partial substitution of the ligand environment of transition metal ions is demonstrated.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600091
D. A. Zolotov, A. V. Buzmakov, I. G. Dyachkova, Yu. S. Krivonosov, Yu. I. Dudchik, V. E. Asadchikov
Abstract
A brief retrospective of the development of laboratory X-ray microtomography at the Shubnikov Institute of Crystallography of the Russian Academy of Sciences (IC RAS) is given. The main methods and approaches that made it possible to increase the informativeness of microtomography measurements—the use of monochromatic radiation, phase-contrast method, and diffraction tomography (topo-tomography)—are reported. Designs of the instruments developed and currently functioning at the IC RAS are described, and some experimental results obtained on them are presented.
摘要 简要回顾了俄罗斯科学院舒布尼科夫晶体学研究所(IC RAS)实验室 X 射线显微层析技术的发展历程。报告介绍了提高显微层析测量信息量的主要方法和途径--使用单色辐射、相位对比法和衍射层析(拓扑层析)。此外,还介绍了 IC RAS 研发的、目前正在运行的仪器的设计,以及在这些仪器上取得的一些实验结果。
{"title":"Laboratory X-ray Microphotography: A Method of Inner Three-Dimensional Structure Reconstruction of Different Nature Objects","authors":"D. A. Zolotov, A. V. Buzmakov, I. G. Dyachkova, Yu. S. Krivonosov, Yu. I. Dudchik, V. E. Asadchikov","doi":"10.1134/s1063774524600091","DOIUrl":"https://doi.org/10.1134/s1063774524600091","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A brief retrospective of the development of laboratory X-ray microtomography at the Shubnikov Institute of Crystallography of the Russian Academy of Sciences (IC RAS) is given. The main methods and approaches that made it possible to increase the informativeness of microtomography measurements—the use of monochromatic radiation, phase-contrast method, and diffraction tomography (topo-tomography)—are reported. Designs of the instruments developed and currently functioning at the IC RAS are described, and some experimental results obtained on them are presented.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s106377452460011x
A. I. Omelchenko, I. G. Dyachkova, D. A. Zolotov, A. A. Kaloyan, V. O. Shepeleva, K. M. Podurets
Abstract
New approaches to the X-ray imaging of joints using different radiation sources are discussed. The structure of a joint cartilage tissue and model objects similar to the cartilage tissue in structure and properties have been studied using X-ray radiation of a laboratory microtomograph and synchrotron radiation. Projection radiography and microtomography images of the internal structure of the model objects and cartilage tissue impregnated with a radiopaque substance have been obtained. Colloidal solutions of titanium and molybdenum oxide bronze biofunctional nanoparticles have been used as contrast agents. The tissue depth distribution of the nanoparticle concentration has been measured by processing the images.
摘要 讨论了利用不同辐射源对关节进行 X 射线成像的新方法。利用实验室显微断层显像仪的 X 射线辐射和同步辐射研究了关节软骨组织的结构以及在结构和特性上与软骨组织相似的模型物体。获得了模型物体和浸渍了不透射线物质的软骨组织内部结构的投影射线照相术和显微断层照相术图像。钛和氧化钼青铜生物功能纳米粒子的胶体溶液被用作造影剂。通过处理图像,测量了纳米粒子浓度的组织深度分布。
{"title":"New Approaches in the Tomographic Visualization of Joints Using X-ray Contrast Nanoparticles and Laser Radiation","authors":"A. I. Omelchenko, I. G. Dyachkova, D. A. Zolotov, A. A. Kaloyan, V. O. Shepeleva, K. M. Podurets","doi":"10.1134/s106377452460011x","DOIUrl":"https://doi.org/10.1134/s106377452460011x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>New approaches to the X-ray imaging of joints using different radiation sources are discussed. The structure of a joint cartilage tissue and model objects similar to the cartilage tissue in structure and properties have been studied using X-ray radiation of a laboratory microtomograph and synchrotron radiation. Projection radiography and microtomography images of the internal structure of the model objects and cartilage tissue impregnated with a radiopaque substance have been obtained. Colloidal solutions of titanium and molybdenum oxide bronze biofunctional nanoparticles have been used as contrast agents. The tissue depth distribution of the nanoparticle concentration has been measured by processing the images.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600029
P. L. Podkur, I. S. Volchkov, L. A. Zadorozhnaya, V. M. Kanevskii
Abstract
ZnO microcrystal arrays have been grown on a (111) silicon substrate by the vapor‒liquid‒crystal deposition, where the liquid phase is gold. The differences between the crystals obtained for growth times of 5, 10, and 15 min are described. The lattice parameters of the microcrystals have been calculated with increasing growth time: а = 3.316 Å, c = 5.281 Å; а = 3.291 Å, c = 5.270 Å; and а = 3.286 Å, c = 5.258 Å. A change in the Au content in the microcrystals during their growth has been found to vary from 0.520 at % at the substrate to 0.035 at % on the surface of the crystals after the 15-min growth. Elemental distribution maps are presented, and the deviation of the lattice parameters of the obtained crystals from the reference values is explained.
{"title":"Doping ZnO Crystals with Gold during Their Growth by the Vapor‒Liquid‒Crystal Method","authors":"P. L. Podkur, I. S. Volchkov, L. A. Zadorozhnaya, V. M. Kanevskii","doi":"10.1134/s1063774524600029","DOIUrl":"https://doi.org/10.1134/s1063774524600029","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>ZnO microcrystal arrays have been grown on a (111) silicon substrate by the vapor‒liquid‒crystal deposition, where the liquid phase is gold. The differences between the crystals obtained for growth times of 5, 10, and 15 min are described. The lattice parameters of the microcrystals have been calculated with increasing growth time: <i>а</i> = 3.316 Å, <i>c</i> = 5.281 Å; <i>а</i> = 3.291 Å, <i>c</i> = 5.270 Å; and <i>а</i> = 3.286 Å, <i>c</i> = 5.258 Å. A change in the Au content in the microcrystals during their growth has been found to vary from 0.520 at % at the substrate to 0.035 at % on the surface of the crystals after the 15-min growth. Elemental distribution maps are presented, and the deviation of the lattice parameters of the obtained crystals from the reference values is explained.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774523601430
E. I. Orlova, M. P. Trukhacheva, T. A. Sorokin, V. B. Kvartalov, A. M. Antipin, N. V. Lyskov, E. P. Kharitonova, N. E. Novikova, N. I. Sorokina, O. A. Alekseeva, V. I. Voronkova
Abstract
Rare-earth molybdenum-containing oxides of the nominal composition LixNd(_{{5-x}})Mo3O(_{{16, pm ,delta }}) (x = 0, 0.05, 0.15, 0.25) with a fluorite-related structure have been obtained for the first time as single crystals grown from flux and by solid-phase synthesis in air in the form of polycrystalline samples. The new phases are characterized using X-ray diffraction analysis, simultaneous thermal analysis, and impedance spectroscopy. X-ray diffraction analysis showed that lithium atoms are localized near the positions of rare-earth cations. The chemical formula of the investigated single crystal is Li0.216Nd4.784Mo3O(_{{14.1 + delta }}). The low lithium content did not affect significantly the ability of the studied phases to dissociative absorption of water but led to a decrease in the total conductivity of LixNd(_{{5-x}})Mo3O(_{{16, pm ,delta }}) lithium ceramics.
{"title":"Structure and Conductivity of Lithium-Doped Fluorite-Like Molybdates Nd5Mo3O16","authors":"E. I. Orlova, M. P. Trukhacheva, T. A. Sorokin, V. B. Kvartalov, A. M. Antipin, N. V. Lyskov, E. P. Kharitonova, N. E. Novikova, N. I. Sorokina, O. A. Alekseeva, V. I. Voronkova","doi":"10.1134/s1063774523601430","DOIUrl":"https://doi.org/10.1134/s1063774523601430","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Rare-earth molybdenum-containing oxides of the nominal composition Li<sub><i>x</i></sub>Nd<span>(_{{5-x}})</span>Mo<sub>3</sub>O<span>(_{{16, pm ,delta }})</span> (<i>x</i> = 0, 0.05, 0.15, 0.25) with a fluorite-related structure have been obtained for the first time as single crystals grown from flux and by solid-phase synthesis in air in the form of polycrystalline samples. The new phases are characterized using X-ray diffraction analysis, simultaneous thermal analysis, and impedance spectroscopy. X-ray diffraction analysis showed that lithium atoms are localized near the positions of rare-earth cations. The chemical formula of the investigated single crystal is Li<sub>0.216</sub>Nd<sub>4.784</sub>Mo<sub>3</sub>O<span>(_{{14.1 + delta }})</span>. The low lithium content did not affect significantly the ability of the studied phases to dissociative absorption of water but led to a decrease in the total conductivity of Li<sub><i>x</i></sub>Nd<span>(_{{5-x}})</span>Mo<sub>3</sub>O<span>(_{{16, pm ,delta }})</span> lithium ceramics.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600182
I. I. Buchinskaya, P. P. Fedorov
Abstract
The congruent melting compositions in the MF2–M'F2–RF3 systems (M ≠ M' = Ca, Sr, Cd, Ba, Pb; R are rare-earth elements (REEs)) have been determined based on thermodynamic topological analysis. Crystals of fluorite solid solution in the PbF2–CdF2–RF3 (R = Tb, Ho, Er, Tm, Yb, Lu) systems were grown by the vertical directional crystallization technique. Their phase composition and distribution of components over the crystalline boule length were investigated. Crystals of congruently melting solid solutions (Pb0.67Cd0.33)(_{{1-x}})RxF(_{{2 + x}}) (R = Tb, Ho, Er, Tm, Yb, Lu) were grown for the first time. Traces of low-temperature transformation—a phase isostructural to the Pb2YF7 compound (sp. gr. I4/m), in which Y sites are occupied by the corresponding R cations and Pb sites can be partially occupied by Cd cations—were found in the crystals with R = Ho, Er, Tm, and Yb. The crystals with R = Tb and Lu have a high degree of homogeneity and are suitable for optical studies.
摘要 基于热力学拓扑分析,确定了 MF2-M'F2-RF3 体系(M≠M' = Ca、Sr、Cd、Ba、Pb;R 为稀土元素(REEs))中的同熔成分。通过垂直定向结晶技术,在 PbF2-CdF2-RF3 (R = Tb、Ho、Er、Tm、Yb、Lu)体系中生长出了萤石固溶体晶体。研究了它们的相组成和晶体束长度上的成分分布。首次生长出了同熔固溶体 (Pb0.67Cd0.33)(_{{1-x}})RxF(_{{2 + x}}) (R = Tb、Ho、Er、Tm、Yb、Lu)的晶体。在 R = Ho、Er、Tm 和 Yb 的晶体中发现了低温转化的痕迹--一种与 Pb2YF7 化合物(sp. gr. I4/m)结构相同的相,其中 Y 位点被相应的 R 阳离子占据,而 Pb 位点可能部分被 Cd 阳离子占据。R = Tb 和 Lu 的晶体具有高度均匀性,适合进行光学研究。
{"title":"Fluorite Solid Solutions of Congruent Melting in the PbF2–CdF2–RF3 Systems","authors":"I. I. Buchinskaya, P. P. Fedorov","doi":"10.1134/s1063774524600182","DOIUrl":"https://doi.org/10.1134/s1063774524600182","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The congruent melting compositions in the <i>M</i>F<sub>2</sub>–<i>M</i>'F<sub>2</sub>–RF<sub>3</sub> systems (<i>M</i> ≠ <i>M</i>' = Ca, Sr, Cd, Ba, Pb; <i>R</i> are rare-earth elements (REEs)) have been determined based on thermodynamic topological analysis. Crystals of fluorite solid solution in the PbF<sub>2</sub>–CdF<sub>2</sub>–<i>R</i>F<sub>3</sub> (<i>R</i> = Tb, Ho, Er, Tm, Yb, Lu) systems were grown by the vertical directional crystallization technique. Their phase composition and distribution of components over the crystalline boule length were investigated. Crystals of congruently melting solid solutions (Pb<sub>0.67</sub>Cd<sub>0.33</sub>)<span>(_{{1-x}})</span><i>R</i><sub><i>x</i></sub>F<span>(_{{2 + x}})</span> (<i>R</i> = Tb, Ho, Er, Tm, Yb, Lu) were grown for the first time. Traces of low-temperature transformation—a phase isostructural to the Pb<sub>2</sub>YF<sub>7</sub> compound (sp. gr. <i>I</i>4/<i>m</i>), in which Y sites are occupied by the corresponding <i>R</i> cations and Pb sites can be partially occupied by Cd cations—were found in the crystals with <i>R</i> = Ho, Er, Tm, and Yb. The crystals with <i>R</i> = Tb and Lu have a high degree of homogeneity and are suitable for optical studies.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600054
V. A. Fedorov, E. V. Antonov, I. D. Venevtsev, V. M. Kanevsky, B. V. Nabatov, E. S. Saltanova
Abstract
The luminescence and scintillation characteristics of cerium-doped yttrium aluminum garnet crystals grown from melts in vacuum have been analyzed. Absorption and X-ray luminescence spectra, X-ray luminescence decay kinetics, and scintillation specific light yield in a wide range of activator concentrations (from 0.0036 to 1.175 at % with respect to substitution for yttrium at the c sites of the garnet structure) have been studied. Effective quenching of the intrinsic luminescence of antisite and vacancy defects of the base crystal in the UV region with an increase in the activator concentration has been found. The optimal activator concentration has been determined in order to increase the X-ray luminescence intensity and the scintillation light yield of Ce3+ ions, with allowance for the technological features of growth of single crystals of high optical quality with a high Ce3+ concentration by the horizontal directional crystallization in vacuum. The dependences of the X-ray luminescence kinetics on the activator concentration have been analyzed. It is shown that crystals with the specific light yield up to 25 000 ph/MeV can be grown.
摘要 分析了掺铈钇铝石榴石晶体在真空中从熔体中生长出来后的发光和闪烁特性。研究了吸收和 X 射线发光光谱、X 射线发光衰减动力学和闪烁特定光产率在较大活化剂浓度范围内(从 0.0036% 到 1.175%,钇在石榴石结构 c 位点的替代率)的变化情况。研究发现,随着活化剂浓度的增加,紫外区基底晶体的反斜长石和空位缺陷的本征发光被有效淬灭。为了提高 Ce3+ 离子的 X 射线发光强度和闪烁光产率,确定了最佳活化剂浓度,同时考虑到了在真空中通过水平定向结晶技术生长出具有高 Ce3+ 浓度的高光学质量单晶的技术特点。分析了 X 射线发光动力学与活化剂浓度的关系。结果表明,可以生长出特定光产率高达 25 000 ph/MeV 的晶体。
{"title":"Influence of Activator Concentration on the Spectral-Luminescence and Scintillation Properties of YAG:Ce Crystals","authors":"V. A. Fedorov, E. V. Antonov, I. D. Venevtsev, V. M. Kanevsky, B. V. Nabatov, E. S. Saltanova","doi":"10.1134/s1063774524600054","DOIUrl":"https://doi.org/10.1134/s1063774524600054","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The luminescence and scintillation characteristics of cerium-doped yttrium aluminum garnet crystals grown from melts in vacuum have been analyzed. Absorption and X-ray luminescence spectra, X-ray luminescence decay kinetics, and scintillation specific light yield in a wide range of activator concentrations (from 0.0036 to 1.175 at % with respect to substitution for yttrium at the <i>c</i> sites of the garnet structure) have been studied. Effective quenching of the intrinsic luminescence of antisite and vacancy defects of the base crystal in the UV region with an increase in the activator concentration has been found. The optimal activator concentration has been determined in order to increase the X-ray luminescence intensity and the scintillation light yield of Ce<sup>3+</sup> ions, with allowance for the technological features of growth of single crystals of high optical quality with a high Ce<sup>3+</sup> concentration by the horizontal directional crystallization in vacuum. The dependences of the X-ray luminescence kinetics on the activator concentration have been analyzed. It is shown that crystals with the specific light yield up to 25 000 ph/MeV can be grown.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.1134/s1063774524600030
I. O. Koshelev, I. S. Volchkov, P. L. Podkur, D. R. Khairetdinova, I. M. Doludenko, V. M. Kanevsky
Abstract
CdTe thin films were grown on Si(111) and Al2O3(0001) substrates by thermal vapor deposition. The obtained films were studied by atomic-force and scanning electron microscopy, as well as by X-ray diffraction analysis. It was found that thin films of both wurtzite and sphalerite CdTe modifications can be grown on Al2O3(0001) substrates. Thin films of the sphalerite CdTe modification can be obtained on Si substrates. It was shown that the elemental composition of thin films is close to stoichiometry, and, in the case of thin films grown on Al2O3(0001), the deviation was no more than 1 at %.
{"title":"Textured CdTe Thin Films on Silicon and Sapphire Substrates: Thermal Vapor Deposition and Structural Characterization","authors":"I. O. Koshelev, I. S. Volchkov, P. L. Podkur, D. R. Khairetdinova, I. M. Doludenko, V. M. Kanevsky","doi":"10.1134/s1063774524600030","DOIUrl":"https://doi.org/10.1134/s1063774524600030","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>CdTe thin films were grown on Si(111) and Al<sub>2</sub>O<sub>3</sub>(0001) substrates by thermal vapor deposition. The obtained films were studied by atomic-force and scanning electron microscopy, as well as by X-ray diffraction analysis. It was found that thin films of both wurtzite and sphalerite CdTe modifications can be grown on Al<sub>2</sub>O<sub>3</sub>(0001) substrates. Thin films of the sphalerite CdTe modification can be obtained on Si substrates. It was shown that the elemental composition of thin films is close to stoichiometry, and, in the case of thin films grown on Al<sub>2</sub>O<sub>3</sub>(0001), the deviation was no more than 1 at %.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}