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The Initial Stages of the Formation of Ferromanganese Crusts on the Ocean Floor 洋底铁锰结壳形成的初始阶段
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774523700219
A. A. Novakova, S. I. Panfilov, V. V. Avdonin, E. A. Zhegallo
{"title":"The Initial Stages of the Formation of Ferromanganese Crusts on the Ocean Floor","authors":"A. A. Novakova,&nbsp;S. I. Panfilov,&nbsp;V. V. Avdonin,&nbsp;E. A. Zhegallo","doi":"10.1134/S1063774523700219","DOIUrl":"10.1134/S1063774523700219","url":null,"abstract":"<p>A nondestructive layer-by-layer elemental and phase analysis of the ferromanganese intact crust (aged about 60 million years), extracted from the 1200-m rise of Magellan Mountains of the Pacific Ocean, has been performed using the X-ray fluorescence and X-ray diffraction methods. The crust morphology was studied using scanning electron microscopy. This analysis made it possible to estimate the contributions of various oceanic sources of iron and manganese to the crusting process and propose a mechanism for its formation.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"431 - 438"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780339","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
Selecting a Target for Obtaining Films of Higher Manganese Silicide Using Magnetron Sputtering 利用磁控溅射技术选择获得高硅酸锰薄膜的靶材
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S106377452460042X
M. S. Lukasov, N. A. Arkharova, A. S. Orekhov, T. S. Kamilov, V. V. Klechkovskaya
{"title":"Selecting a Target for Obtaining Films of Higher Manganese Silicide Using Magnetron Sputtering","authors":"M. S. Lukasov,&nbsp;N. A. Arkharova,&nbsp;A. S. Orekhov,&nbsp;T. S. Kamilov,&nbsp;V. V. Klechkovskaya","doi":"10.1134/S106377452460042X","DOIUrl":"10.1134/S106377452460042X","url":null,"abstract":"<p>Thin manganese silicide films were obtained on mica by magnetron sputtering from targets of three types. The microstructure and elemental composition of the targets and films were studied by scanning electron microscopy and reflection electron diffraction. The phase composition and structure of the films over depth (cuts) were controlled by scanning and transmission electron microscopy. It has been shown that, when depositing films from poly- and single-crystal targets of higher manganese silicide, in contrast to a target from sintered Мn and Si powders, one can obtain polycrystalline films of higher manganese silicide of the Mn<sub>4</sub>Si<sub>7</sub> composition after subsequent 1-h annealing at a temperature of 800 K and a pressure of 10<sup>–3</sup> Pa.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"374 - 379"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780628","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
Upper Limit of the Mobility and Concentration of Charge Carriers in Fluoride Superionic Conductors with Fluorite and Tysonite Structures 具有萤石和泰山石结构的氟化物超离子导体中电荷载体的迁移率和浓度上限
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600388
N. I. Sorokin
{"title":"Upper Limit of the Mobility and Concentration of Charge Carriers in Fluoride Superionic Conductors with Fluorite and Tysonite Structures","authors":"N. I. Sorokin","doi":"10.1134/S1063774524600388","DOIUrl":"10.1134/S1063774524600388","url":null,"abstract":"<p>The maximum values of the mobility and concentration of charge carriers in fluoride superionic conductors of the fluorite (CaF<sub>2</sub>, SrF<sub>2</sub>, BaF<sub>2</sub>, and PbF<sub>2</sub>) and tysonite (LaF<sub>3</sub>) structural types have been calculated within the crystallophysical model. It is shown that the upper limits of the ionic conductivity and carrier mobility and concentration in the crystalline state of fluoride superionics are, respectively, 4 ± 1 S/cm, (5 ± 1) × 10<sup>−3</sup> cm<sup>2</sup>/(V s), and (5 ± 2) × 10<sup>21</sup> cm<sup>−3</sup> (10 ± 4% of the total amount of fluorine ions).</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"339 - 343"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780625","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 Properties of Surface Acoustic Waves in a Lithium Niobate Single Crystal with a Silicon Dioxide Film by the Finite-Element Method 用有限元法研究带有二氧化硅薄膜的铌酸锂单晶中的表面声波特性
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774523600266
O. L. Balysheva, A. S. Koigerov, B. Ts. Rakshaev
{"title":"Investigation of the Properties of Surface Acoustic Waves in a Lithium Niobate Single Crystal with a Silicon Dioxide Film by the Finite-Element Method","authors":"O. L. Balysheva,&nbsp;A. S. Koigerov,&nbsp;B. Ts. Rakshaev","doi":"10.1134/S1063774523600266","DOIUrl":"10.1134/S1063774523600266","url":null,"abstract":"<p>Characteristics of surface acoustic waves in lithium niobate single crystal/silicon dioxide film structures, which are used to increase the thermal stability of acoustoelectric devices on single-crystal substrates, have been calculated. The simulation has been performed by the finite-element method using the COMSOL software, and the velocity, electromechanical coupling coefficient, and temperature coefficient of frequency in the structures with lithium niobate of different cuts have been calculated. A good agreement is observed between the results obtained and the data in the literature. The obtained parameters are of practical importance for developing various acoustoelectric devices.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"344 - 350"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780638","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
Chain-Melting Phase Transition in a Lamellar Film of Dimyristoyl-Phosphatidylserine on the Surface of a Silica Hydrosol 二氧化硅水溶液表面二肉豆蔻酰磷脂酰丝氨酸层状膜中的链熔相转变
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600509
A. M. Tikhonov, Yu. O. Volkov, A. D. Nuzhdin, B. S. Roshchin, V. E. Asadchikov
{"title":"Chain-Melting Phase Transition in a Lamellar Film of Dimyristoyl-Phosphatidylserine on the Surface of a Silica Hydrosol","authors":"A. M. Tikhonov,&nbsp;Yu. O. Volkov,&nbsp;A. D. Nuzhdin,&nbsp;B. S. Roshchin,&nbsp;V. E. Asadchikov","doi":"10.1134/S1063774524600509","DOIUrl":"10.1134/S1063774524600509","url":null,"abstract":"<p>The structure dynamics in the temperature range of the melting phase transition of a dimyristoyl-phosphatidylserine multilayer on the surface of a colloidal silica solution with a particle diameter of 5 nm has been investigated by X-ray reflectometry and grazing diffraction of 71-keV photons. The joint model and model-free analysis of the reflectometry data revealed a structure consisting of a surface lipid monolayer and a set of lamellar bilayers sandwiched between water layers, with a period of ~150 Å. With an increase in temperature above the critical value one can observe a surface monolayer transition from a crystalline phase with a minimum area per lipid molecule of 40 ± 1 Å<sup>2</sup> to a disordered (liquid) phase with a calculated area per molecule of 52 ± 2 Å<sup>2</sup>. At low temperatures, the data indicate that from five to eight H<sub>2</sub>O molecules are tightly bound to the PS fragment of the lipid in both the monolayer and the bilayer structures. However, above the transition temperature, approximately 14 water molecules are attached to the headgroups of the bilayer: this is almost twice as many molecules as the eight H<sub>2</sub>O molecules-per-headgroup in the surface monolayer.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"365 - 373"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780431","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
Kinetic Characteristics of Crystallization in a Model Synovial Fluid Solution in the Presence of Organic Impurities 存在有机杂质的滑膜液模型溶液的结晶动力学特征
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774523020074
O. A. Golovanova
{"title":"Kinetic Characteristics of Crystallization in a Model Synovial Fluid Solution in the Presence of Organic Impurities","authors":"O. A. Golovanova","doi":"10.1134/S1063774523020074","DOIUrl":"10.1134/S1063774523020074","url":null,"abstract":"<p>The kinetic regularities of crystallization (its order and constants) in a model solution of human synovia (inorganic composition) under conditions close to physiological have been investigated. The crystallization constants in a pure solution and in the presence of organic synovia additives with variation in their concentration and supersaturation of the model solution are determined. The following descending order sequence is proposed for the influence of additives on the general and particular kinetic characteristics of crystallization in a model synovial solution: glucose → proline → alanine → glycine → citric acid. It is found that impurities affect to a greater extent the nucleation process rather than growth stages.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"452 - 458"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780432","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
Influence of the Domain Structure of LaBGeO5 Polar Crystals on Their Gyrotropic Properties LaBGeO5 极性晶体的晶域结构对其陀螺特性的影响
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600327
A. F. Konstantinova, T. G. Golovina, E. I. Mareev, A. V. Butashin, I. S. Volchkov, R. V. Gainutdinov, N. M. Asharchuk, V. M. Kasimova, E. V. Zabelina, N. S. Kozlova
{"title":"Influence of the Domain Structure of LaBGeO5 Polar Crystals on Their Gyrotropic Properties","authors":"A. F. Konstantinova,&nbsp;T. G. Golovina,&nbsp;E. I. Mareev,&nbsp;A. V. Butashin,&nbsp;I. S. Volchkov,&nbsp;R. V. Gainutdinov,&nbsp;N. M. Asharchuk,&nbsp;V. M. Kasimova,&nbsp;E. V. Zabelina,&nbsp;N. S. Kozlova","doi":"10.1134/S1063774524600327","DOIUrl":"10.1134/S1063774524600327","url":null,"abstract":"<p>The spectra of transmisson coefficients and absorption indices of single-domain and multidomain LaBGeO<sub>5</sub> samples have been measured. It is shown that, to measure more exactly the optical rotation ρ, it is necessary to use the spectra of transmission coefficients not only for the cases of parallel and crossed polarizers but also at other angles between them. The obtained ρ values for both samples are described quite well by only dispersion using the Drude formula. This is in agreement with the fact that the ρ value should not change during transition to the single-domain state of the crystal at a given symmetry (<i>P</i>3<sub>1</sub> in the ferroelectric phase and <i>P</i>3<sub>1</sub>21 in the paraelectric phase). It is shown that the Cherenkov-type second harmonic generation (SHG) is observed only in a polydomain sample, while the second-harmonic radiation is not polarized. The domain structure of the samples was observed by scanning electron microscopy and piezoelectric force microscopy. The presence of a labyrinth-like domain structure was shown for the multidomain sample, whereas for a single-domain sample no changes in contrast were observed within the scanned region.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"324 - 331"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780626","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
Influence of Copper Powder Structure on the Catalytic Properties of Cerium Oxide 铜粉结构对氧化铈催化特性的影响
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600339
O. M. Zhigalina, O. S. Morozova, D. N. Khmelenin, E. N. Cherkovskiy, A. A. Firsova, V. G. Basu, G. A. Vorobieva
{"title":"Influence of Copper Powder Structure on the Catalytic Properties of Cerium Oxide","authors":"O. M. Zhigalina,&nbsp;O. S. Morozova,&nbsp;D. N. Khmelenin,&nbsp;E. N. Cherkovskiy,&nbsp;A. A. Firsova,&nbsp;V. G. Basu,&nbsp;G. A. Vorobieva","doi":"10.1134/S1063774524600339","DOIUrl":"10.1134/S1063774524600339","url":null,"abstract":"<p>The influence of the structure of copper powder particles on the catalytic activity of the CeO<sub>2</sub>/Cu catalyst was studied using the methods of X-ray diffraction, electron microscopy, electron diffraction, energy dispersive X-ray analysis, as well as temperature-programmed reduction of CO (CO-TPR). Nanocomposites were obtained by mechanochemical synthesis using copper particles differing in size and morphology: micron-sized dendrites and nanoparticles. It was shown that the activity of the catalyst obtained from nanosized copper is two times higher, which is due to the presence of Cu<sub><i>x</i></sub>O clusters located on the atomic steps of cerium oxide nanocrystals. This arrangement of clusters apparently prevents blocking of activating centers. Thus, the surface structure of cerium oxide particles formed when using nanosized copper powder is a key factor responsible for the catalytic activity.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"395 - 404"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780336","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
Determination of the Structure of Weakly Ordered Films According to X-ray Diffraction Data 根据 X 射线衍射数据确定弱有序薄膜的结构
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600364
S. B. Astaf’ev, L. G. Yanusova
{"title":"Determination of the Structure of Weakly Ordered Films According to X-ray Diffraction Data","authors":"S. B. Astaf’ev,&nbsp;L. G. Yanusova","doi":"10.1134/S1063774524600364","DOIUrl":"10.1134/S1063774524600364","url":null,"abstract":"<p>A method for searching for parameters of structural models of weakly ordered thin films based on X-ray diffraction data containing a small number of reflexes is proposed. The developed method makes it possible to reduce the number of possible structural models, despite the small number of interference maxima, determine the parameters of possible elementary cells and index the corresponding peaks on diffractograms. It is shown how the use of a priori data makes it possible to obtain physically adequate solutions. The method of determining structural parameters is demonstrated by analyzing an experimental curve containing only three diffraction peaks (maxima). The corresponding search algorithms are implemented within the framework of the analytical software package BARD (Basic Analysis of xRay Diffraction).</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"390 - 394"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780434","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
Two-Dimensional Ferroelectric Crystals 二维铁电晶体
IF 0.6 4区 材料科学
Crystallography Reports Pub Date : 2024-07-25 DOI: 10.1134/S1063774524600303
V. M. Fridkin
{"title":"Two-Dimensional Ferroelectric Crystals","authors":"V. M. Fridkin","doi":"10.1134/S1063774524600303","DOIUrl":"10.1134/S1063774524600303","url":null,"abstract":"<p>The polarization switching kinetics of ferroelectric crystals and the transition from the domain to uniform switching in single-crystal nanofilms have been considered within the Landau–Ginzburg theory. It is shown that, within the chosen theory, the uniform (domainless) switching can be described only for two-dimensional ferroelectrics. Experimental results for two-dimensional films of ferroelectric polymer and barium titanate are presented. For ultrathin polymer films, these results are also confirmed by ab initio calculations.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 3","pages":"332 - 338"},"PeriodicalIF":0.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780627","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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