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Variety of Free Crystal Shapes 各种自由晶体形状
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524601758
V. I. Rakin
{"title":"Variety of Free Crystal Shapes","authors":"V. I. Rakin","doi":"10.1134/S1063774524601758","DOIUrl":"10.1134/S1063774524601758","url":null,"abstract":"<p>The diversity of free crystal shapes in nature is statistically described by the coefficient of variation in the central distances to symmetrically equivalent faces of simple crystallographic forms present on the crystal. The coefficient of variation for natural crystals lies in a limited range of values from 0.02 to 0.2. This regularity, implemented during growth, dissolution, and in the equilibrium state, is accompanied by a number of natural phenomena, which is explained by the fluctuation model of crystal growth. An increase in the coefficient of variation leads to temperature rise; nonstationarity of the process; and dissymmetrizing phenomena, which include gravitational field, anisotropy of facet supply, and geometry of free space. A decrease in the coefficient of variation causes prolonged growth or dissolution and symmetrization effects, which manifest themselves under the complex influence of several factors, including mechanical impacts on the crystal.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1173 - 1184"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422983","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}
引用次数: 0
Investigation of the Phase Formation and Structure of TbCo2 Cubic Laves Phase after Doping with Indium Atoms 掺杂铟原子后TbCo2立方叶相形成及结构的研究
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524602259
A. B. Mikhailova, G. A. Politova, D. A. Morozov, M. A. Ganin
{"title":"Investigation of the Phase Formation and Structure of TbCo2 Cubic Laves Phase after Doping with Indium Atoms","authors":"A. B. Mikhailova,&nbsp;G. A. Politova,&nbsp;D. A. Morozov,&nbsp;M. A. Ganin","doi":"10.1134/S1063774524602259","DOIUrl":"10.1134/S1063774524602259","url":null,"abstract":"<p>The X-ray Rietveld method has been used to refine the structure, determine the lattice periods, and study the phase composition of the samples of multicomponent polycrystalline solid solutions TbCo<span>(_{{(2-x)}})</span>In<sub><i>x</i></sub> (<i>х</i> = 0, 0.05, 0.1, 0.15, 0.20, 0.25, 0.3, 0.35, 0.4), which are characterized by large values of magnetostriction saturation. With an increase in the indium concentration, the content of the TbCo<sub>2</sub> phase with a Laves phase structure decreases, the content of the TbCo<sub>3</sub> phase increases, and a Tb<sub>11</sub>Co<sub>4</sub>In<sub>9</sub> phase is formed. The lattice period in the TbCo<sub>2</sub> compound (sp. gr. <i>Fd</i><span>(bar {3})</span><i>m</i>) changes nonlinearly: increases in the range of <i>x</i> = 0–0.1 from <i>a</i> = 7.209(8) Å to <i>a</i> = 7.216(1) Å due to the replacement of cobalt atoms with indium atoms, having a larger radius. Then, in the concentration range of <i>x</i> = 0.15–0.4, it decreases to <i>a</i> = 7.205(1) Å at <i>х</i> = 0.4 due to the replacement of terbium atoms with indium and formation of structural defects.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1100 - 1106"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423417","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}
引用次数: 0
Laakso–Taagepera Index and Its Use for Structural Database Analysis laakso - taagpera索引及其在结构数据库分析中的应用
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524601503
D. A. Banaru, A. M. Banaru, S. M. Aksenov
{"title":"Laakso–Taagepera Index and Its Use for Structural Database Analysis","authors":"D. A. Banaru,&nbsp;A. M. Banaru,&nbsp;S. M. Aksenov","doi":"10.1134/S1063774524601503","DOIUrl":"10.1134/S1063774524601503","url":null,"abstract":"<p>The Laakso–Taagepera index belongs to Hill numbers, which characterize diversity of species. The paper demonstrates application of this index for comparing the distributions of structures from the databases ICSD (116 860 records), CSD (1 294 724 records), PDB (184 841 records), and RRUFF (~5.5 thousand mineral species) over space-group types, crystal classes, and crystal systems.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1019 - 1026"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423128","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}
引用次数: 0
Structure, Spectral Characteristics, and Phase Transitions in the Rb3CoCl4NO3 Crystal Rb3CoCl4NO3晶体的结构、光谱特性和相变
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524602089
A. V. Gudymenko, V. A. Komornikov, N. I. Sorokina, T. A. Sorokin, I. S. Timakov, D. S. Matveeva, A. E. Voloshin
{"title":"Structure, Spectral Characteristics, and Phase Transitions in the Rb3CoCl4NO3 Crystal","authors":"A. V. Gudymenko,&nbsp;V. A. Komornikov,&nbsp;N. I. Sorokina,&nbsp;T. A. Sorokin,&nbsp;I. S. Timakov,&nbsp;D. S. Matveeva,&nbsp;A. E. Voloshin","doi":"10.1134/S1063774524602089","DOIUrl":"10.1134/S1063774524602089","url":null,"abstract":"<p>Rb<sub>3</sub>CoCl<sub>4</sub>NO<sub>3</sub> samples applicable for studying spectral characteristics have been obtained for the first time and investigated in the wavelength range λ = 200–800 nm. Transparency windows are found at the UV–visible and visible–IR boundaries. Differential-scanning calorimetry/thermogravimetry analysis revealed that the Rb<sub>3</sub>CoCl<sub>4</sub>NO<sub>3</sub> crystal is thermally stable, melts without decomposition, and undergoes two reversible phase transitions. The structure of Rb<sub>3</sub>CoCl<sub>4</sub>NO<sub>3</sub> single crystals was studied by X-ray diffraction in the temperature range of 293–625 K.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1035 - 1044"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423130","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}
引用次数: 0
Linear and Nonlinear Dielectric Response of VDF60/Tr40 Copolymer in the Vicinity of Ferroelectric Phase Transition 铁电相变附近 VDF60/Tr40 共聚物的线性和非线性介电响应
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524602260
K. A. Verkhovskaya, M. A. Pankova, I. I. Popov, L. N. Korotkov
{"title":"Linear and Nonlinear Dielectric Response of VDF60/Tr40 Copolymer in the Vicinity of Ferroelectric Phase Transition","authors":"K. A. Verkhovskaya,&nbsp;M. A. Pankova,&nbsp;I. I. Popov,&nbsp;L. N. Korotkov","doi":"10.1134/S1063774524602260","DOIUrl":"10.1134/S1063774524602260","url":null,"abstract":"<p>The effect of the bias electric field <i>E</i><sub>=</sub> (0–10 kV/cm) on the dielectric properties of the VDF<sub>60</sub>/Tr<sub>40</sub> copolymer was studied in the temperature range of 20–110°C. It was found that the dielectric nonlinearity Δε is negative in the polar phase and becomes positive above the Curie temperature (<i>T</i><sub>C</sub>). The increase in <i>T</i><sub>C</sub> under the field <i>E</i><sub>=</sub> is not uniform. At <i>E</i><sub>=</sub> &lt; <i>E</i><sub><i>c</i></sub> (<i>E</i><sub><i>c</i></sub> is the threshold field), the Curie temperature is practically independent of <i>E</i><sub>=</sub>. At <i>E</i><sub>=</sub> &gt; <i>E</i><sub><i>c</i></sub>, an increase in <i>T</i><sub>C</sub> is observed. The presence of the threshold field indicates the existence of sources of random electric fields in the material under study. It is suggested that they are responsible for the smearing of the ferroelectric phase transition.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"886 - 891"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423421","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}
引用次数: 0
Retraction Note: Investigation of the Influence of Electron Irradiation on the Properties of Cobalt Nanotubes 电子辐照对钴纳米管性能影响的研究
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524060026
D. I. Shlimas, A. L. Kozlovskiy, M. V. Zdorovets, K. K. Kadyrzhanov, V. V. Uglov, E. E. Shumskaya, E. Y. Kaniukov
{"title":"Retraction Note: Investigation of the Influence of Electron Irradiation on the Properties of Cobalt Nanotubes","authors":"D. I. Shlimas,&nbsp;A. L. Kozlovskiy,&nbsp;M. V. Zdorovets,&nbsp;K. K. Kadyrzhanov,&nbsp;V. V. Uglov,&nbsp;E. E. Shumskaya,&nbsp;E. Y. Kaniukov","doi":"10.1134/S1063774524060026","DOIUrl":"10.1134/S1063774524060026","url":null,"abstract":"","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"1008 - 1008"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423488","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}
引用次数: 0
Retraction Note: Study of the Reactivity of Ni Nanotubes in Media with Different рН 撤稿说明：镍纳米管在不同рН介质中的反应性研究
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524060038
G. Kalkabay, A. L. Kozlovskiy, M. A. Ibragimova, D. I. Shlimas, M. V. Zdorovets, D. B. Borgekov, A. V. Tikhonov
{"title":"Retraction Note: Study of the Reactivity of Ni Nanotubes in Media with Different рН","authors":"G. Kalkabay,&nbsp;A. L. Kozlovskiy,&nbsp;M. A. Ibragimova,&nbsp;D. I. Shlimas,&nbsp;M. V. Zdorovets,&nbsp;D. B. Borgekov,&nbsp;A. V. Tikhonov","doi":"10.1134/S1063774524060038","DOIUrl":"10.1134/S1063774524060038","url":null,"abstract":"","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"1009 - 1009"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423490","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}
引用次数: 0
Solid Solutions CaMo(1–x)WxO4: Simulation of Properties and Local Environment of Ions 固溶体CaMo(1-x)WxO4：离子性质和局部环境的模拟
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S106377452460159X
V. B. Dudnikova, N. N. Eremin
{"title":"Solid Solutions CaMo(1–x)WxO4: Simulation of Properties and Local Environment of Ions","authors":"V. B. Dudnikova,&nbsp;N. N. Eremin","doi":"10.1134/S106377452460159X","DOIUrl":"10.1134/S106377452460159X","url":null,"abstract":"<p>CaMo<span>(_{{(1-x)}})</span>W<sub><i>x</i></sub>O<sub>4</sub> solid solutions have been simulated using the interatomic potential method. The dependences of the unit-cell parameters and volume, density, bulk modulus, enthalpy, vibrational entropy, and heat capacity on the composition were determined, and temperature dependences of the heat capacity and vibrational entropy were plotted. The local structure of the solid solutions was investigated. The coordination polyhedra СаО<sub>8</sub>, as well as МоО<sub>4</sub> and WO<sub>4</sub> tetrahedra, were found to change with variation in the solid solution concentration. It is shown that all polyhedra are additionally distorted in intermediate compositions, which may be a cause of the improvement of the spectral characteristics of mixed compositions.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1011 - 1018"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423127","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}
引用次数: 0
Experimental Study of the Method of X-ray Phase-Contrast Microscopy Using a Nanofocusing Lens at KISI-Kurchatov Synchrotron Source ksi -库尔恰托夫同步加速器源纳米聚焦透镜x射线相衬显微镜方法的实验研究
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524602429
M. S. Folomeshkin, V. G. Kohn, A. Yu. Seregin, Yu. A. Volkovsky, P. A. Prosekov, V. A. Yunkin, A. A. Snigirev, Yu. V. Pisarevsky, A. E. Blagov, M. V. Kovalchuk
{"title":"Experimental Study of the Method of X-ray Phase-Contrast Microscopy Using a Nanofocusing Lens at KISI-Kurchatov Synchrotron Source","authors":"M. S. Folomeshkin,&nbsp;V. G. Kohn,&nbsp;A. Yu. Seregin,&nbsp;Yu. A. Volkovsky,&nbsp;P. A. Prosekov,&nbsp;V. A. Yunkin,&nbsp;A. A. Snigirev,&nbsp;Yu. V. Pisarevsky,&nbsp;A. E. Blagov,&nbsp;M. V. Kovalchuk","doi":"10.1134/S1063774524602429","DOIUrl":"10.1134/S1063774524602429","url":null,"abstract":"<p>The results of the experimental study at the KISI-Kurchatov synchrotron source of the new phase-contrast imaging scheme for micro-objects using a nanofocusing compound refractive lens are presented. Visualization with submicron spatial resolution of a Fresnel zone plate with the width of the outer zones less than 0.5 µm is demonstrated. It is found that in the performed experiments the main contribution to the instrumental function, which limits the spatial resolution, is due to the vibrations of the optical scheme elements. The possibility of using the proposed scheme for estimating the beam transverse size at the focus of the compound refractive lens, with allowance for the instrumental function, is demonstrated.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"787 - 793"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423321","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}
引用次数: 0
Characterization of Annealed Proton Exchange Waveguides in Mixed Lithium Niobate-tantalate Solid Solution 铌酸锂-钽酸锂混合固溶体中退火质子交换波导的表征
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2025-02-16 DOI: 10.1134/S1063774524601825
A. V. Sosunov, I. V. Petukhov, A. R. Kornilicyn, A. A. Mololkin, R. R. Fahrtdinov, M. Kuneva
{"title":"Characterization of Annealed Proton Exchange Waveguides in Mixed Lithium Niobate-tantalate Solid Solution","authors":"A. V. Sosunov,&nbsp;I. V. Petukhov,&nbsp;A. R. Kornilicyn,&nbsp;A. A. Mololkin,&nbsp;R. R. Fahrtdinov,&nbsp;M. Kuneva","doi":"10.1134/S1063774524601825","DOIUrl":"10.1134/S1063774524601825","url":null,"abstract":"<p>The new lithium niobate-tantalate hybrid optical material platform can be used for special tasks in integrated photonics: waveguides, periodical poling, modulators and sensors. A comparison of structure and optical characteristics was performed between optical waveguides obtained by annealed proton exchange in lithium niobate (LN) and mixed lithium niobate-tantalate (LNT) solid solutions. The prism coupling method, IR-spectroscopy and X-ray diffraction were used to study the annealed proton exchange waveguides. The calculated increment of refractive index after proton exchange was 0.129 for LNT compared to 0.112 for LN. This unusual high increase of the refractive index of LNT is likely due to the presence of both compressive and tensile deformations of the crystal lattice of LNT as a result of proton exchange. The results of IR-spectroscopy indicate a more intense proton exchange in mixed crystals, which leads to greater structural disorder, in contrast to LN. The diffusion coefficients are higher for LNT unlike LN crystals and annealing relaxation of crystal lattice stresses is faster, subsequently. This is the first report on using proton exchange technology for optical waveguides fabrication in LNT solid solutions.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1115 - 1120"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423419","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}
引用次数: 0
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