Crystallography Reports最新文献

Effect of Precursors on the Stoichiometry and Morphology of Cobalt Ferrites 前驱体对钴铁氧体化学计量学和形貌的影响

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774525601637

A. F. Turaev, O. S. Kakhkhorov, M. Z. Sharipov, N. M. Nazarova, O. E. Abdurakhmonov, Z. Matkarimov, Sh. Abdurakhmonov, M. K. Kurbanov, D. S. Saidov, M. S. Paizullakhanov, S. Abduraimov, M. Pirimmatov, B. E. Egamberdiev, U. B. Sharopov

{"title":"Effect of Precursors on the Stoichiometry and Morphology of Cobalt Ferrites","authors":"A. F. Turaev, O. S. Kakhkhorov, M. Z. Sharipov, N. M. Nazarova, O. E. Abdurakhmonov, Z. Matkarimov, Sh. Abdurakhmonov, M. K. Kurbanov, D. S. Saidov, M. S. Paizullakhanov, S. Abduraimov, M. Pirimmatov, B. E. Egamberdiev, U. B. Sharopov","doi":"10.1134/S1063774525601637","DOIUrl":"10.1134/S1063774525601637","url":null,"abstract":"The influence of precursors and the nominal CoO:Fe2O3 ratio on the stoichiometry and morphology of cobalt ferrites was investigated. The alloys were produced by directed solar melting at the focus of the Big Solar Furnace followed by water quenching. The microstructure was studied using transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), while the local composition was analyzed by energy-dispersive X-ray spectroscopy (EDS). It was shown that variation of the Co/Fe ratio determines the particle size, degree of agglomeration, and structural ordering. For compositions close to CoFe2O4, more homogeneous structures are formed with a higher degree of crystallinity. Control of the melting/quenching regime stabilizes the particle size distribution. The established “precursors–composition–morphology” relationships confirm the reproducibility of solar synthesis and enable targeted selection of the initial CoO and Fe2O3 ratios and molar fractions to align the local stoichiometry with the desired nominal composition.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"71 2","pages":"331 - 338"},"PeriodicalIF":0.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336775","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

Restoring the Orthorhombic Structure and Improving the Superconducting Properties of Textured YBCO Superconductors after 25 Years of Storage 25年后YBCO织构超导体正交结构的恢复和超导性能的改善

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774526600080

A. E. Rabadanova, S. Kh. Gadzhimagomedov, D. K. Palchaev, M. Kh. Rabadanov, A. A. Antsiferova, A. A. Bush, Zh. Kh. Murlieva, Sh. P. Faradzhev, R. M. Emirov, N. M.-R. Alikhanov

{"title":"Restoring the Orthorhombic Structure and Improving the Superconducting Properties of Textured YBCO Superconductors after 25 Years of Storage","authors":"A. E. Rabadanova, S. Kh. Gadzhimagomedov, D. K. Palchaev, M. Kh. Rabadanov, A. A. Antsiferova, A. A. Bush, Zh. Kh. Murlieva, Sh. P. Faradzhev, R. M. Emirov, N. M.-R. Alikhanov","doi":"10.1134/S1063774526600080","DOIUrl":"10.1134/S1063774526600080","url":null,"abstract":"The effect of thermal exposure of textured YBCO ceramics on its structure and properties after long-term (25 years) storage at room temperature has been studied. Effective restoration of the orthorhombic structure and improvement of the superconducting properties of YBCO ceramics via its saturation with O2 at 500°C for 10 h using powders of the same composition with an optimum oxygen content have been demonstrated. The 00l-type reflections 001, 002, 003, 004, 005, 006, 007, 008, and 009 revealed by X-ray diffraction analysis are indicative of a high degree of texturing of the ceramics. Oxygen saturation of the ceramic samples leads to a change in the conductivity type from semiconductor to metallic. It has been established that, with an increase in the degree of oxygen saturation, the intensity of the O(4) mode at 500 cm–1 and the mode at 340 cm–1 corresponding to vibrations of O(2)/O(3) atoms in the CuO2 planes significantly increase.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"71 2","pages":"298 - 305"},"PeriodicalIF":0.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336853","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

Preparation of Corn Stalk Charcoal Composite Film and Study on Its NH3 Adsorption Performance 玉米秸秆炭复合膜的制备及其NH3吸附性能研究

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S106377452660002X

Z. Xing, Y. Yang, F. Li, H. Chen, R. Wang, D. Yang, M. H. Han, J. Li, O. P. Taran

{"title":"Preparation of Corn Stalk Charcoal Composite Film and Study on Its NH3 Adsorption Performance","authors":"Z. Xing, Y. Yang, F. Li, H. Chen, R. Wang, D. Yang, M. H. Han, J. Li, O. P. Taran","doi":"10.1134/S106377452660002X","DOIUrl":"10.1134/S106377452660002X","url":null,"abstract":"This study utilized corn stover as the biomass feedstock to produce stover charcoal (CC) through modification with oxalic acid. The charcoal was then composited with polyvinylidene fluoride (PVDF) using a coating-crosslinking method, resulting in CC/PVDF composite membranes. By optimizing key parameters including crosslinking agent concentration, crosslinking time, and charcoal loading, a composite membrane with outstanding ammonia adsorption performance was obtained. The membrane’s morphology, chemical composition, and mechanical properties were characterized by scanning electron microscopy, infrared spectroscopy, and a universal testing machine. The results indicate that the optimal ammonia adsorption capacity of 40.4 mg/cm2 was achieved under the following conditions: a binder ratio of 1 : 2, a crosslinking agent concentration of 3%, and a crosslinking time of 90 min. After regeneration with ethanol, the membrane retained 69.3% of its initial ammonia adsorption capacity. Furthermore, compared to the original stover charcoal, the composite membrane surface incorporated additional oxygen-containing functional groups (e.g., carboxyl and hydroxyl groups), which contributed to its enhanced ammonia adsorption and removal.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"71 2","pages":"237 - 246"},"PeriodicalIF":0.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336772","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

Ionic Conductivity of CeF3 Crystals Produced by Gradient Melt Freezing under Temperature Exposure in Vacuum 真空温度暴露下梯度熔体冻结法制备CeF3晶体的离子电导率

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774526601152

N. I. Sorokin, D. N. Karimov

{"title":"Ionic Conductivity of CeF3 Crystals Produced by Gradient Melt Freezing under Temperature Exposure in Vacuum","authors":"N. I. Sorokin, D. N. Karimov","doi":"10.1134/S1063774526601152","DOIUrl":"10.1134/S1063774526601152","url":null,"abstract":"Applying the technique of gradient melt freezing in a fluorinating atmosphere, large single-phase blocks of cerium fluoride crystals with a characteristic brown color, associated with quenching of point defects, were fabricated, and the influence of the formed color centers on the optical transmission and ionic conductivity of CeF3 during thermal heating in a vacuum was studied. The material under study crystallizes in the sp. gr. (Pbar {3}c1) and is characterized by additional optical absorption in the wavelength range of 350−650 nm, caused by the formation of color centers. Annealing of CeF3 at temperatures up to 827 K leads to thermal destruction of defect centers and release of fluorine vacancies, which causes an increase in the ionic conductivity of the crystals by ∼2 times as compared to the initial level, reaching a value of σdc = 3.5 × 10−4 S/cm (500 K), while maintaining the ion-transfer activation enthalpy ΔHa = 0.37 eV. The obtained results can be used to develop modes of post-growth thermal annealing of Се3+-based crystalline materials.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"71 2","pages":"256 - 262"},"PeriodicalIF":0.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336773","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

Electronic and Crystal Structure of Cobalt Ferrite Alloys Synthesized by Concentrated Solar Heating 聚光加热合成钴铁氧体合金的电子和晶体结构

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774525601467

A. F. Turaev, O. S. Kakhkhorov, M. Z. Sharipov, N. M. Nazarova, O. E. Abdurakhmonov, M. K. Kurbanov, D. S. Saidov, A. S. Komolov, I. A. Pronin, B. E. Egamberdiyev, U. B. Sharopov

引用次数: 0

A Family of Crystals of Ethylenediamine Complexes of Copper(II) Chloride 氯化铜（II）乙二胺配合物的一类晶体

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774526600158

V. A. Komornikov, N. E. Novikova, A. V. Gudymenko, I. S. Timakov, I. A. Verin, A. E. Voloshin

引用次数: 0

Dissymmetrization in Labuntsovite-Group Minerals. I: Features of Cation Ordering over Sites of the Crystal Structure of Tsepinite-K within the Pm Model labuntsote - group矿物中的不对称现象。1: Pm模型中钾铁铁矿晶体结构中阳离子在位点上的有序特征

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774525601881

R. K. Rastsvetaeva, V. M. Gridchina, N. V. Chukanov, S. M. Aksenov

引用次数: 0

Elastic Waves at the Twist Boundaries in Orthorhombic, Tetragonal, Hexagonal, and Cubic Crystals 正交、四边形、六边形和立方晶体中扭转边界处的弹性波

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774526600092

A. N. Darinskii

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Kinematical Theory of a Restricted X-ray Beam Diffraction in a Bent Crystal 弯曲晶体中受限x射线束衍射的运动学理论

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774525601911

V. I. Punegov

引用次数: 0

Mössbauer Study of Nanostructured Nd–Fe–B Alloys Produced by a Chemical Method Mössbauer化学法制备纳米Nd-Fe-B合金的研究

IF 0.5 4区材料科学

Crystallography Reports Pub Date : 2026-06-29 DOI: 10.1134/S1063774526600018

O. E. Abdurakhmonov, M. Kh. Aripova, Sh. E. Abdurakhmonov, Z. T. Matkarimov, B. R. Ruzibaev, M. K. Kurbanov, D. S. Saidov, O. A. Abdulkhaev, U. B. Sharopov, A. A. Komolova, A. S. Komolov

{"title":"Mössbauer Study of Nanostructured Nd–Fe–B Alloys Produced by a Chemical Method","authors":"O. E. Abdurakhmonov, M. Kh. Aripova, Sh. E. Abdurakhmonov, Z. T. Matkarimov, B. R. Ruzibaev, M. K. Kurbanov, D. S. Saidov, O. A. Abdulkhaev, U. B. Sharopov, A. A. Komolova, A. S. Komolov","doi":"10.1134/S1063774526600018","DOIUrl":"10.1134/S1063774526600018","url":null,"abstract":"\u0000\t\t\t\t\t\t—The preparation and comprehensive structural analysis of nanostructured Nd16Fe76B8, alloy, synthesized chemically using nanodispersed Nd2O3, α-Fe2O3, and Fe3BO6 precursors, are described. The morphology and dispersion of the initial nanoparticles and the final product were studied using transmission electron microscopy. The phase composition and crystal structure were determined by X-ray diffraction, followed by refinement using the Rietveld method. The main phase of the alloy was shown to be tetragonal Nd2Fe14B, which is consistent with the results of X-ray diffraction analysis. The local state of iron was further studied by Mössbauer spectroscopy at 293 K: the spectrum is satisfactorily described by six Zeeman sextets corresponding to the positions of Fe atoms 16k\u0000\t\t\t\t\t\t1, 16k\u0000\t\t\t\t\t\t2, 8j\u0000\t\t\t\t\t\t1, 8j\u0000\t\t\t\t\t\t2, 4e, and 4c in the Nd2Fe14B structure. The hyperfine interaction parameters confirm that Fe belongs to the Nd2Fe14B phase and do not require the introduction of components characteristic of Fe2B/FeB borides. The obtained results demonstrate applicability of the chemically assisted reduction–diffusion approach for the production of nanostructured Nd–Fe–B alloys with a controlled phase structure.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"71 2","pages":"306 - 313"},"PeriodicalIF":0.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336770","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