Crystallography Reports最新文献

{"title":"Microstructure of Bismuth-Doped Yttrium Iron Garnet Thin Films","authors":"I. A. Subbotin,&nbsp;E. M. Pashaev,&nbsp;A. O. Belyaeva,&nbsp;I. N. Trunkin,&nbsp;S. S. Dubinin,&nbsp;K. A. Merentsova,&nbsp;M. S. Artemyev,&nbsp;A. P. Nosov,&nbsp;A. L. Vasiliev","doi":"10.1134/S1063774525600243","DOIUrl":"10.1134/S1063774525600243","url":null,"abstract":"<p>Complex structural studies of nanosized bismuth-doped yttrium iron garnet (BYIG) films have been performed using X-ray diagnostics, scanning/transmission electron microscopy, and energy-dispersive X-ray microanalysis. The crystal structure of the film–substrate interface and near-surface layers, along with the change in the interplanar distance over the film thickness, have been determined. The following features of the film microstructure were revealed: the presence of pores, the absence of misfit dislocation at the interface, the formation of maghemite (γ-Fe₂O₃) particles on the film surface, and a decrease in the Bi content towards the film surface. Suggestions about the influence of the Bi content on the magneto-optical properties in dependence of the film thickness are made.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 3","pages":"499 - 509"},"PeriodicalIF":0.5,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167961","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}

{"title":"Progress in the Crystal Chemistry of New Fumarolic Minerals Discovered in the 2014–2024 and Their Synthetic Analogues","authors":"O. I. Siidra,&nbsp;E. V. Nazarchuk,&nbsp;A. S. Borisov,&nbsp;V. A. Ginga,&nbsp;D. O. Nekrasova","doi":"10.1134/S1063774524602910","DOIUrl":"10.1134/S1063774524602910","url":null,"abstract":"<p>The review presents the results of the extensive study of the new anhydrous minerals discovered in the fumaroles of the Tolbachik volcano (Kamchatka) during the last 10 years. The conditions for the synthesis of fumarolic mineral analogues and the features of their crystal chemistry are described. The emphasis is given to the minerals containing sulfate or vanadate anions, the discovery of which gave rise to large families of inorganic compounds and materials with rich and interesting crystal chemistry. A separate section is devoted to the progress in the field of high-temperature X-ray diffraction study of exhalative minerals. Several rare topotactic single crystal to single crystal (SC–SC) transformations detected for vergasovaite and aleutite are described.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"178 - 214"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169382","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}

{"title":"100th Anniversary of the Department of Crystallography of St. Petersburg State University: Pages of History","authors":"S. V. Krivovichev","doi":"10.1134/S1063774524602855","DOIUrl":"10.1134/S1063774524602855","url":null,"abstract":"<p>The major milestones in the centennial history of the Department of Crystallography of St. Petersburg State University, the oldest of the existing departments of crystallography in Russia, are considered. It is shown that the St. Petersburg scientific crystallographic school originates from the great Russian scientist E.S. Fedorov (1853–1919). The main areas of the scientific activity of the staff (crystal morphology, crystal optics, crystal growth, crystal chemistry, crystal physics, X-ray diffraction analysis) are described, and biographical information about the heads of the department (O.M. Ansheles, V.B. Tatarsky, V.A. Frank-Kamenetsky, S.K. Filatov, Y.O. Punin) is given.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"160 - 177"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169378","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}

{"title":"Thermal Expansion of Oxygen Compounds Based on Triangular, Tetrahedral, or Mixed Anionic Groups","authors":"R. S. Bubnova,&nbsp;M. G. Krzhizhanovskaya,&nbsp;S. K. Filatov","doi":"10.1134/S1063774524602995","DOIUrl":"10.1134/S1063774524602995","url":null,"abstract":"<p>Data on the thermal properties of about 200 oxygen compounds, built from triangular (borates, carbonates, nitrates) and tetrahedral (silicates, sulfates) groups are summarized. An analysis of the dependence of the volumetric thermal expansion coefficient α_<i>V</i>  of these compounds and their melting points is carried out in accordance with the systematics by S.K. Filatov, based on the value of the residual charge <i>Z</i> per one anionic polyhedron beyond this polyhedron. The residual charge <i>Z</i> of an anionic group characterizes the degree of polymerization of such groups. This approach is used for mixed groups (tetrahedral with different charges of the central atom) and developed for heteropolyhedral anionic groups (both oxygen triangles and tetrahedra in borates). It has been shown that the volumetric thermal expansion increases and the melting temperature decreases with a decrease in the residual charge <i>Z</i> due to the rise in the degree of condensation of anionic groups and weakening in the strength of the cation–oxygen bonds. At the same residual charge <i>Z</i> of the anionic group, the spread of α_V values makes it possible to reveal the influence of the cation charge and size: thermal expansion increases as the charge decreases and the cation radius increases. Among the studied oxygen compounds the structures with tetrahedra have minimal volumetric expansion (borates: 〈α_<i>V</i>〉₃ = 22 × 10⁻⁶, borosilicates: 〈α_<i>V</i>〉₂₇ = 29 × 10⁻⁶, aluminosilicates: 〈α_<i>V</i>〉₂₇ = 28 × 10⁻⁶, and silicates: 〈α_<i>V</i>〉₃₄ = 27 × 10⁻⁶ °С⁻¹). Compounds with triangular groups (borates: 〈α_<i>V</i>〉₃₂ = 41 × 10⁻⁶, carbonates: 〈α_<i>V</i>〉₁₀ = 40 × 10⁻⁶ °С⁻¹) and borates with mixed anion groups (〈α_<i>V</i>〉₄₀ = 43 × 10⁻⁶ °С⁻¹) exhibit intermediate values. Sulphates with isolated tetrahedra (〈α_<i>V</i>〉₂₁ = 90 × 10⁻⁶ °С⁻¹) and nitrates with isolated triangles (〈α_<i>V</i>〉₅ = 132 × 10⁻⁶ °С⁻¹) demonstrate maximal volumetric expansion values, which is caused by the weakening in the bonds beyond the anionic complex.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"288 - 312"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169383","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}

{"title":"On Geometrical Features of Packing of Molecular Crystals of Cubic, Hexagonal, and Trigonal Syngonies","authors":"N. V. Somov,&nbsp;A. Yu. Egorova,&nbsp;E. V. Chuprunov","doi":"10.1134/S1063774524602909","DOIUrl":"10.1134/S1063774524602909","url":null,"abstract":"<p>The geometrical aspects of packing of molecular crystals of cubic and hexagonal syngonies have been considered. It has been shown that, when asymmetric molecules are packed into a crystal, a fraction of the unit-cell regions forbidden for arrangement of molecules (forbidden volume) is one the main geometrical factors affecting the abundance of a particular group of symmetry. Symmetric molecules predominantly occupy particular orbitals, which correspond to the close and closest packings of spheres. A list of regular systems of space groups of symmetry of cubic and hexagonal singonies has been obtained, the regular systems of points of which can describe close packings of molecules in terms of the closest packings of spheres.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"336 - 340"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169375","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}

{"title":"Hydrotalcite-Group Minerals: Crystal Chemistry and a New Look at “Old” Minerals","authors":"E. S. Zhitova,&nbsp;S. V. Krivovichev,&nbsp;I. V. Pekov,&nbsp;A. A. Zolotarev","doi":"10.1134/S1063774524602831","DOIUrl":"10.1134/S1063774524602831","url":null,"abstract":"<p>The data on the structures of the hydrotalcite-group minerals—layered double hydroxides with the general formula <span>(M_{6}^{{2 + }}M_{2}^{{3 + }}{{({text{OH}})}_{{16}}}A_{{2/m}}^{{m-}})</span>⋅4H₂O (<i>М</i>²⁺ = Mg²⁺, Ni²⁺; <i>М</i>³⁺ = Al³⁺, Fe³⁺, Cr³⁺, Mn³⁺, Co³⁺; <i>A</i> = <span>({text{CO}}_{3}^{{2 - }})</span>, Cl^– and OH^–)—are summarized. It is shown that all of them crystallize with the structure of 3<i>R</i>- and 2<i>H</i>-polytypes without the formation of superstructures. Their unit-cell parameter <i>a</i> ranges within 3.05–3.13 Å. The characteristic interlayer distances <i>d</i>_00<i>n</i> for the group members with carbonate and chloride anions are ~7.80 and 8.04 Å, respectively (<i>c</i> = <i>d</i>_00<i>n</i> × 2 for 2<i>H</i> and <i>c</i> = <i>d</i>_00<i>n</i> × 3 for 3<i>R</i>). Three hydrotalcite-group minerals should be reconsidered taking into account the new crystallographic data and regularities: takovite and droninoite most likely correspond to minerals of the quintinite group with <i>M</i>²⁺ : <i>M</i>³⁺ = 2 : 1, rather than to the hydrotalcite-group minerals, and the data on reevesite indicate that this name could describe two minerals with <i>M</i>²⁺ : <i>M</i>³⁺ = 3 : 1 and 2 : 1.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"325 - 335"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169381","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}

{"title":"Results of 25-Year Studies of Uranium Compounds at the Department of Crystallography of St. Petersburg State University","authors":"V. V. Gurzhiy,&nbsp;E. V. Nazarchuk,&nbsp;Y. G. Tagirova,&nbsp;S. V. Krivovichev","doi":"10.1134/S1063774524602879","DOIUrl":"10.1134/S1063774524602879","url":null,"abstract":"<p>The study of uranium-bearing natural and synthetic compounds is one of the main scientific areas that have been implemented at the Department of Crystallography of St. Petersburg State University for a quarter of a century. With the participation of the department’s staff, three new uranium minerals were discovered, the structures of 15 known mineral species were determined and refined, and more than 370 new synthetic uranium compounds were obtained and characterized. Based on the research results, more than 200 scientific papers were published, including three monographs and more than 190 scientific papers in leading world journals in mineralogical, crystallographic, and chemical research areas. This review briefly highlights the most interesting, in the authors’ opinion, results of crystal-chemical studies of uranium compounds obtained over 25 years of activity by the staff of the Department of Crystallography of St. Petersburg State University.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"235 - 270"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169379","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}

{"title":"Thermal Evolution of Phosphates and Sulfates with Antiperovskite Structure Type (The Thermal Expansion Features and Phase Transitions)","authors":"M. S. Avdontceva,&nbsp;A. A. Zolotarev,&nbsp;M. G. Krzhizhanovskaya,&nbsp;S. V. Krivovichev","doi":"10.1134/S1063774524602818","DOIUrl":"10.1134/S1063774524602818","url":null,"abstract":"<p>The thermal behavior of natural and synthetic phosphates and sulfates with an antiperovskite structure type, where the anion-centered octahedron is the main structural unit, is investigated. Herein, we discuss the examples of thermal behavior of antiperovskites with the classical and hexagonal 3D frameworks (K₃SO₄F, Rb₃SO₄F, synthetic analogue of kogarkoite, Na₃SO₄F, galeite, Na₁₅(SO₄)₅ClF₄, and schairerite Na₂₁(SO₄)₇ClF₆), with 1D chains of corner- and face-sharing octahedra (nacaphite, Na₂CaPO₄F and its synthetic dimorph, synthetic analogue of moraskoite, Na₂MgPO₄F, and nefedovite, Na₅Ca₄(PO₄)₄F), and with clusters in the form of trimers of anion-centered octahedra (synthetic analogue of arctite (Na₅Ca)Ca₆Ba(PO₄)₆F₃). Using the data obtained, some general patterns of the thermal expansion in dependence of the structural topology and thermal stability of antiperovskites were established.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"313 - 324"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169376","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}

{"title":"Crystal Chemistry of Silver Borates with Salt Inclusion Structure","authors":"S. N. Volkov,&nbsp;D. O. Charkin,&nbsp;S. M. Aksenov,&nbsp;A. M. Banaru,&nbsp;Yu. O. Kopylova,&nbsp;R. S. Bubnova","doi":"10.1134/S1063774524602946","DOIUrl":"10.1134/S1063774524602946","url":null,"abstract":"<p>A review of structural studies of silver borates with a salt inclusion structure is presented. Besides the presentation of the first halogen-containing silver borates, we discuss the structural and physicochemical characterization of the Ag₄B₄O₇<i>X</i>₂ (<i>X</i> = Br, I), Ag₃B₆O₁₀<i>X</i> (<i>X</i> = Br, I, NO₃), and Ag₄B₇O₁₂<i>X</i> (<i>X</i> = Cl, Br, I) families, as well as the Ag₄(B₃O₆)(NO₃) and Ag₃B₄O₆(OH)₂(NO₃). The dimensionality of their crystal structures varies from three to two or zero. In the majority of cases, the silver atoms exhibit strong anharmonicity of thermal displacements, which was studied by X-ray structural analysis, including polythermic. We discuss the reasons for the low stability of chlorine-containing silver borates, as well as the relationships between the anharmonicity of thermal displacements and other properties, including the high ionic conductivity of Ag₃B₆O₁₀I.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"271 - 287"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169380","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}

{"title":"Natural Anhydrous Sulfates with Alkali Cations: Structural Features, Comparative Crystal Chemistry, and Genetic Mineralogy","authors":"N. V. Zubkova,&nbsp;I. V. Pekov,&nbsp;N. V. Potekhina,&nbsp;D. Yu. Pushcharovsky","doi":"10.1134/S1063774524602934","DOIUrl":"10.1134/S1063774524602934","url":null,"abstract":"<p>The review summarizes the data on the crystal chemistry and genetic mineralogy of all known natural anhydrous sulfates with Na or/and K as species-defining alkali cations (61 mineral species, 48 structural types). Only two genetic types of mineralization, namely, volcanic fumaroles and evaporites, are significant for these minerals. Both these mineral-forming systems are characterized by a low pressure, but they strongly differ in the temperature and crystallization mechanisms. In terms of the structural classification, these minerals are divided into the following two large groups: minerals having anionic motifs consisting only of SO₄ tetrahedra (and also of additional F, Cl, and CO₃ anions) and minerals having heteropolyhedral anionic motifs consisting of SO₄ tetrahedra and polyhedra of cations with relatively high-strength characteristics (Mg, Mn, Zn, Cu, Fe, V, Al, Bi, Mo, As, Te, and sometimes Ca). This is consistent with the genetic types. Thus, representatives of the first group predominate among evaporitic minerals, whereas representatives of the second group prevail among fumarolic minerals. A clear positive correlation was revealed between the degree of polymerization of a heteropolyhedral anionic motif and the number of minerals, which have such motifs. Thus, the heteropolyhedral motifs can be described as frameworks or pseudoframeworks with different topologies in 18 minerals, as layers in 11 minerals, and as chains in 8 minerals. Only one mineral contains isolated heteropolyhedral complex. The review discusses different types of decay of solid solutions and other solid-state transformations in high-temperature sulfates with aphthitalite-like structures from volcanic fumaroles.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 2","pages":"215 - 234"},"PeriodicalIF":0.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169374","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}