Pub Date : 2024-07-25DOI: 10.1134/s106377452460042x
M. S. Lukasov, N. A. Arkharova, A. S. Orekhov, T. S. Kamilov, V. V. Klechkovskaya
Abstract
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 Mn4Si7 composition after subsequent 1-h annealing at a temperature of 800 K and a pressure of 10–3 Pa.
{"title":"Selecting a Target for Obtaining Films of Higher Manganese Silicide Using Magnetron Sputtering","authors":"M. S. Lukasov, N. A. Arkharova, A. S. Orekhov, T. S. Kamilov, V. V. Klechkovskaya","doi":"10.1134/s106377452460042x","DOIUrl":"https://doi.org/10.1134/s106377452460042x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774523700219
A. A. Novakova, S. I. Panfilov, V. V. Avdonin, E. A. Zhegallo
Abstract
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.
摘要 利用 X 射线荧光和 X 射线衍射方法，对从太平洋麦哲伦山海拔 1200 米处提取的铁锰完整地壳（年龄约 6000 万年）进行了无损逐层元素和相分析。使用扫描电子显微镜对地壳形态进行了研究。通过分析，可以估算出各种海洋来源的铁和锰对结壳过程的贡献，并提出了结壳形成的机制。
{"title":"The Initial Stages of the Formation of Ferromanganese Crusts on the Ocean Floor","authors":"A. A. Novakova, S. I. Panfilov, V. V. Avdonin, E. A. Zhegallo","doi":"10.1134/s1063774523700219","DOIUrl":"https://doi.org/10.1134/s1063774523700219","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774524600388
N. I. Sorokin
Abstract
The maximum values of the mobility and concentration of charge carriers in fluoride superionic conductors of the fluorite (CaF2, SrF2, BaF2, and PbF2) and tysonite (LaF3) 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) × 10−3 cm2/(V s), and (5 ± 2) × 1021 cm−3 (10 ± 4% of the total amount of fluorine ions).
{"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":"https://doi.org/10.1134/s1063774524600388","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774523600266
O. L. Balysheva, A. S. Koigerov, B. Ts. Rakshaev
Abstract
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.
{"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, A. S. Koigerov, B. Ts. Rakshaev","doi":"10.1134/s1063774523600266","DOIUrl":"https://doi.org/10.1134/s1063774523600266","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 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
Abstract
The spectra of transmisson coefficients and absorption indices of single-domain and multidomain LaBGeO5 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 (P31 in the ferroelectric phase and P3121 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.
{"title":"Influence of the Domain Structure of LaBGeO5 Polar Crystals on Their Gyrotropic Properties","authors":"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","doi":"10.1134/s1063774524600327","DOIUrl":"https://doi.org/10.1134/s1063774524600327","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774524600509
A. M. Tikhonov, Yu. O. Volkov, A. D. Nuzhdin, B. S. Roshchin, V. E. Asadchikov
Abstract
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 Å2 to a disordered (liquid) phase with a calculated area per molecule of 52 ± 2 Å2. At low temperatures, the data indicate that from five to eight H2O 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 H2O molecules-per-headgroup in the surface monolayer.
{"title":"Chain-Melting Phase Transition in a Lamellar Film of Dimyristoyl-Phosphatidylserine on the Surface of a Silica Hydrosol","authors":"A. M. Tikhonov, Yu. O. Volkov, A. D. Nuzhdin, B. S. Roshchin, V. E. Asadchikov","doi":"10.1134/s1063774524600509","DOIUrl":"https://doi.org/10.1134/s1063774524600509","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774523020074
O. A. Golovanova
Abstract
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.
{"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":"https://doi.org/10.1134/s1063774523020074","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774524600339
O. M. Zhigalina, O. S. Morozova, D. N. Khmelenin, E. N. Cherkovskiy, A. A. Firsova, V. G. Basu, G. A. Vorobieva
Abstract—
The influence of the structure of copper powder particles on the catalytic activity of the CeO2/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 CuxO 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.
摘要 利用 X 射线衍射、电子显微镜、电子衍射、能量色散 X 射线分析以及 CO 的温度编程还原（CO-TPR）等方法研究了铜粉颗粒结构对 CeO2/Cu 催化剂催化活性的影响。利用不同大小和形态的铜颗粒（微米大小的树枝状颗粒和纳米颗粒），通过机械化学合成法获得了纳米复合材料。研究表明，由纳米铜制成的催化剂的活性要高出两倍，这是因为在纳米氧化铈晶体的原子阶上存在 CuxO 簇。团簇的这种排列方式显然可以防止活化中心受阻。因此，使用纳米铜粉形成的氧化铈颗粒的表面结构是催化活性的关键因素。
{"title":"Influence of Copper Powder Structure on the Catalytic Properties of Cerium Oxide","authors":"O. M. Zhigalina, O. S. Morozova, D. N. Khmelenin, E. N. Cherkovskiy, A. A. Firsova, V. G. Basu, G. A. Vorobieva","doi":"10.1134/s1063774524600339","DOIUrl":"https://doi.org/10.1134/s1063774524600339","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract—</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774524600364
S. B. Astaf’ev, L. G. Yanusova
Abstract
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).
摘要 提出了一种根据含有少量反射的 X 射线衍射数据搜索弱有序薄膜结构模型参数的方法。尽管干扰最大值的数量很少，但所开发的方法可以减少可能的结构模型的数量，确定可能的基本单元的参数，并在衍射图上标出相应的峰值。研究表明，使用先验数据可以获得物理上适当的解决方案。通过分析仅包含三个衍射峰（最大值）的实验曲线，演示了确定结构参数的方法。相应的搜索算法是在分析软件包 BARD（X 射线衍射基本分析）的框架内实现的。
{"title":"Determination of the Structure of Weakly Ordered Films According to X-ray Diffraction Data","authors":"S. B. Astaf’ev, L. G. Yanusova","doi":"10.1134/s1063774524600364","DOIUrl":"https://doi.org/10.1134/s1063774524600364","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
Pub Date : 2024-07-25DOI: 10.1134/s1063774524600303
V. M. Fridkin
Abstract
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.
摘要 根据朗道-金兹堡理论，研究了铁电晶体的极化转换动力学以及单晶纳米薄膜中从有域转换到均匀转换的过程。研究表明，在所选理论中，只有二维铁电体才能描述均匀（无畴）开关。本文介绍了二维铁电聚合物薄膜和钛酸钡薄膜的实验结果。对于超薄聚合物薄膜，这些结果也得到了 ab initio 计算的证实。
{"title":"Two-Dimensional Ferroelectric Crystals","authors":"V. M. Fridkin","doi":"10.1134/s1063774524600303","DOIUrl":"https://doi.org/10.1134/s1063774524600303","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.7,"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}
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