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Memory Effects in Magnetoplasticity of NaCl Crystals NaCl晶体磁塑性中的记忆效应
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600553
M. V. Koldaeva, E. A. Petrzhik, V. I. Alshits, V. B. Kvartalov
{"title":"Memory Effects in Magnetoplasticity of NaCl Crystals","authors":"M. V. Koldaeva,&nbsp;E. A. Petrzhik,&nbsp;V. I. Alshits,&nbsp;V. B. Kvartalov","doi":"10.1134/S1063774525600553","DOIUrl":"10.1134/S1063774525600553","url":null,"abstract":"<p>Memory effects in magnetoplasticity of NaCl crystals with different impurity content have been studied. Dislocation paths and microhardness of crystals after their exposure to a constant magnetic field or to crossed ultralow magnetic fields are measured. In two crystals, noticeable relaxation displacements of dislocations, introduced after exposure, are found. In two other crystals with a lower impurity concentration, the paths remain at the background level, but in one of them the exposure causes an increase in the density of mobile dislocations. Similar magnetic exposure also leads to a decrease in the microhardness of crystals, but to different extent. Interpretation of observations is reduced to a spin-dependent transformation of impurity centers in a magnetic field, which plastisizes the crystal. Introduction of dislocations after magnetic exposure leads to their relaxation displacements from unstable positions, and at strongly weakened pinning centers dislocation immediately occupy positions close to equilibrium.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"583 - 594"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028103","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
Irradiation Creep in Metals: Multiscale Modelling 金属的辐照蠕变：多尺度模型
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600498
A. B. Sivak, V. M. Chernov
{"title":"Irradiation Creep in Metals: Multiscale Modelling","authors":"A. B. Sivak,&nbsp;V. M. Chernov","doi":"10.1134/S1063774525600498","DOIUrl":"10.1134/S1063774525600498","url":null,"abstract":"<p>The irradiation creep in metals with cubic crystal lattices at low stresses (below the yield strength) was studied within the framework of multiscale modelling. The modelling combines theoretical (dislocation theory of crystal plasticity, diffusion theory, anisotropic theory of elasticity, chemical kinetics) and computational (molecular statics, molecular dynamics, object kinetic Monte Carlo method) approaches. The values of the rate and modulus of irradiation creep were determined in metals with bcc (Fe, V) and fcc (Cu) crystal lattices containing rectilinear dislocations with the Burgers vectors 1/2〈111〉, 〈100〉 (bcc), and 1/2〈110〉 (fcc), uniformly distributed over possible families of their slip systems. The obtained calculated and theoretical values of the irradiation creep rate and modulus are in good agreement with the results of reactor experiments.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"630 - 637"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028321","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
Magnetoresistance in Superionic Conductor 超离子导体中的磁电阻
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600814
E. D. Yakushkin
{"title":"Magnetoresistance in Superionic Conductor","authors":"E. D. Yakushkin","doi":"10.1134/S1063774525600814","DOIUrl":"10.1134/S1063774525600814","url":null,"abstract":"<p>The magnetoresistance effect has been revealed in a superionic conductor: a Pb<sub>0.66</sub>Cd<sub>0.34</sub>F<sub>2</sub> single crystal. The effect is apparently related to the action of the Lorentz force on the system of mobile F<sup>–</sup> ions. The effect is approximately 1% at a magnetic field with induction of about 1 T.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"661 - 664"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028102","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
Temperature Dependence of the Elastic Moduli and Period of Magnetic Spirals in Cubic Helimagnets with Spins in Nonequivalent Positions 非等效位置自旋的三次helimages磁螺旋弹性模量和周期的温度依赖性
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600590
V. A. Chizhikov, V. E. Dmitrienko
{"title":"Temperature Dependence of the Elastic Moduli and Period of Magnetic Spirals in Cubic Helimagnets with Spins in Nonequivalent Positions","authors":"V. A. Chizhikov,&nbsp;V. E. Dmitrienko","doi":"10.1134/S1063774525600590","DOIUrl":"10.1134/S1063774525600590","url":null,"abstract":"<p>Critical phenomena in cubic helimagnets with nonequivalent magnetic atoms are investigated within the framework of the Weiss mean-field theory. The reason for the occurrence of temperature dependences of elastic moduli and the pitch of the magnetic helicoid is found, and the form of these dependences, determining the change in the conditions for the appearance of magnetic skyrmions in the type-II multiferroic Cu<sub>2</sub>OSeO<sub>3</sub>, is predicted.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"606 - 611"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028319","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
Kinetics of Discrete Kinks and Domain Walls 离散扭结和畴壁动力学
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600607
B. V. Petukhov
{"title":"Kinetics of Discrete Kinks and Domain Walls","authors":"B. V. Petukhov","doi":"10.1134/S1063774525600607","DOIUrl":"10.1134/S1063774525600607","url":null,"abstract":"<p>The kinetics of kinks and domain walls in quasi-one-dimensional systems is described within the framework of a model intermediate between the sharp kink model and the continuum model of an elastic string. The effects resulting from the discrete structure of crystalline materials are considered, including the periodic inhomogeneity of the energy relief for kink migration. Within a transparent approximation using a minimum number of internal variables, the dependence of the Peierls barriers on the driving force is calculated, and the transition between static and dynamic regimes is described. The theory is based on the universal Frenkel–Kontorova model and can be applied to extended systems of various nature.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"553 - 559"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028100","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
Interaction of Ferroelectric Domain Walls and Shape of Equilibrium Repolarization Nuclei 铁电畴壁的相互作用与平衡重极化核的形状
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600486
A. Yu. Belov
{"title":"Interaction of Ferroelectric Domain Walls and Shape of Equilibrium Repolarization Nuclei","authors":"A. Yu. Belov","doi":"10.1134/S1063774525600486","DOIUrl":"10.1134/S1063774525600486","url":null,"abstract":"<p>The growth of a repolarization nucleus in an electric field is hindered by cohesive forces acting near its tips on the adjacent domain walls. They can take large values when the distance between domain walls becomes comparable to their thickness. It is shown that the cohesive forces are expressed via the coefficients of the Ginzburg–Landau energy expansion, which includes a gradient contribution. For a uniaxial ferroelectric, the maximum internal field associated with the gradient interaction of the domain walls has been estimated. It is related to the internal coercive field <i>E</i><sub><i>c</i>0</sub> of the Ginzburg–Landau theory as <span>({{E}_{{{text{max}}}}}{text{*}})</span>/<i>E</i><sub><i>c</i>0</sub> = 3√3/8 ≈ 0.65.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"547 - 552"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028358","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
X-ray Topo-Tomography of Large HPHT Synthetic Diamonds 大HPHT合成金刚石的x射线拓扑层析成像
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600760
D. A. Zolotov, A. V. Buzmakov, A. F. Khokhryakov, Yu. M. Borzdov, L. D. Yagudin, Yu. N. Palyanov, I. G. Dyachkova, V. E. Asadchikov, A. A. Shiryaev
{"title":"X-ray Topo-Tomography of Large HPHT Synthetic Diamonds","authors":"D. A. Zolotov,&nbsp;A. V. Buzmakov,&nbsp;A. F. Khokhryakov,&nbsp;Yu. M. Borzdov,&nbsp;L. D. Yagudin,&nbsp;Yu. N. Palyanov,&nbsp;I. G. Dyachkova,&nbsp;V. E. Asadchikov,&nbsp;A. A. Shiryaev","doi":"10.1134/S1063774525600760","DOIUrl":"10.1134/S1063774525600760","url":null,"abstract":"<p>Extended defects in large synthetic diamonds grown at high pressures and high temperatures (HPHT) using the thermal gradient method were studied by X-ray topo-tomography with a laboratory setup. It is shown that the temperature and growth rate are the principal factors influencing the crystalline quality of the diamonds. Synthesis at high temperatures and low rates allows growth of single crystals with a low density of dislocations, stacking faults, and microtwin lamellae. The annihilation kinetics of the extended defects during annealing at high pressure implies important role of vacancy diffusion. The annihilation of such defects leads to formation of perfect dislocations.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"536 - 546"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028361","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
Structural Features and Transport Properties of Lithiated Fluorite-Like Molybdates Nd5Mo3O16 in the Temperature Range of 20–900°С 20-900°范围内类萤石钼酸盐Nd5Mo3O16的结构特征和输运性质С
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600565
E. I. Orlova, E. S. Smirnova, N. V. Lyskov, E. P. Kharitonova, T. A. Sorokin, A. M. Antipin, E. V. Sidorova, N. E. Novikova, N. I. Sorokina, V. I. Voronkova, O. A. Alekseeva
{"title":"Structural Features and Transport Properties of Lithiated Fluorite-Like Molybdates Nd5Mo3O16 in the Temperature Range of 20–900°С","authors":"E. I. Orlova,&nbsp;E. S. Smirnova,&nbsp;N. V. Lyskov,&nbsp;E. P. Kharitonova,&nbsp;T. A. Sorokin,&nbsp;A. M. Antipin,&nbsp;E. V. Sidorova,&nbsp;N. E. Novikova,&nbsp;N. I. Sorokina,&nbsp;V. I. Voronkova,&nbsp;O. A. Alekseeva","doi":"10.1134/S1063774525600565","DOIUrl":"10.1134/S1063774525600565","url":null,"abstract":"<div><p>The structures of lithiated fluorite-like molybdates of the <i>Ln</i><sub>5</sub>Mo<sub>3</sub>O<span>(_{{16 + delta }})</span> family were studied in the temperature range of 20–777°С (293–1050 К) by accurate X-ray diffraction analysis. A thermally activated redistribution of oxygen ions over the lattice and interstitial positions and reversible changes in the positions occupancies upon heating–cooling were established. The thermal stability, the oxygen ionic conductivity, and dielectric properties of ceramic samples of undoped and Li-containing phases Nd<sub>5</sub>Mo<sub>3</sub>O<span>(_{{16 + delta }})</span> were investigated in the temperature range of 20–900°С. The study demonstrated the possibility of controlling the functional properties of materials for medium-temperature solid oxide fuel cells.</p></div>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"560 - 567"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028318","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
Surface Acoustic Waves in Layer–Substrate Structures of Arbitrary Anisotropy 任意各向异性层-衬底结构中的表面声波
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600723
A. N. Darinskii, Yu. A. Kosevich
{"title":"Surface Acoustic Waves in Layer–Substrate Structures of Arbitrary Anisotropy","authors":"A. N. Darinskii,&nbsp;Yu. A. Kosevich","doi":"10.1134/S1063774525600723","DOIUrl":"10.1134/S1063774525600723","url":null,"abstract":"<p>The existence of surface acoustic waves (SAWs) in a semi-infinite substrate with a deposited solid layer is theoretically investigated. The substrate and the layer are not piezoelectrics but may belong to any class of crystallographic symmetry. By writing down the dispersion equation in the form of a condition on the substrate and layer impedance matrices, it is possible to determine, using the properties of impedances, the maximum allowable number of surface waves, depending on the contact type and the relation between the velocities of bulk waves in the substrate and layer materials. A dispersion equation is derived for the symmetric orientation of an orthorhombic substrate with a deposited monoatomic layer, and the possibility of existence of a purely flexure surface acoustic wave in the case of a very hard surface layer, for example, a graphene monolayer on a soft polymer substrate, is shown.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"595 - 605"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028320","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
Role of the Residue L254 in the Substrate Recognition by Carboxypeptidase T from Thermoactinomyces Vulgaris Revealed by X-Ray Diffraction x射线衍射分析热放线菌羧基肽酶T对底物识别的作用
IF 0.5 4区 材料科学
Crystallography Reports Pub Date : 2025-09-10 DOI: 10.1134/S1063774525600474
V. Kh. Akparov, V. I. Timofeev, G. E. Konstantinova, I. P. Kuranova
{"title":"Role of the Residue L254 in the Substrate Recognition by Carboxypeptidase T from Thermoactinomyces Vulgaris Revealed by X-Ray Diffraction","authors":"V. Kh. Akparov,&nbsp;V. I. Timofeev,&nbsp;G. E. Konstantinova,&nbsp;I. P. Kuranova","doi":"10.1134/S1063774525600474","DOIUrl":"10.1134/S1063774525600474","url":null,"abstract":"<p>The crystal structures of the L254N mutant of carboxypeptidase T in complexes with stable transition state analogs, such as sulfamoyl-<i>L</i>-glutamate, <i>N</i>-sulfamoyl-<i>L</i>-arginine, <i>N</i>-sulfamoyl-<i>L</i>-valine, and <i>N</i>-sulfamoyl-<i>L</i>-leucine, were determined at 2.05, 1.89, 2.30, and 1.79 Å resolution, respectively. The association constants of these inhibitors and the catalytic efficiency of the corresponding tripeptide substrates ZAAX were found to depend on the distances between the О15, О16, О20, and Т19 atoms of the ligand and the active-site residues N146, Y225, and E277 of the mutant protein. This dependence significantly differs from that found previously for wild-type carboxypeptidase T. These results demonstrate that leucine 254 of the flexible loop of metallocarboxypeptidases is involved in the substrate discrimination by carboxypeptidase T via the induced-fit mechanism.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"70 4","pages":"573 - 582"},"PeriodicalIF":0.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028106","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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