Crystallography Reports最新文献

{"title":"Laakso–Taagepera Index and Its Use for Structural Database Analysis","authors":"D. A. Banaru,&nbsp;A. M. Banaru,&nbsp;S. M. Aksenov","doi":"10.1134/S1063774524601503","DOIUrl":"10.1134/S1063774524601503","url":null,"abstract":"<p>The Laakso–Taagepera index belongs to Hill numbers, which characterize diversity of species. The paper demonstrates application of this index for comparing the distributions of structures from the databases ICSD (116 860 records), CSD (1 294 724 records), PDB (184 841 records), and RRUFF (~5.5 thousand mineral species) over space-group types, crystal classes, and crystal systems.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1019 - 1026"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423128","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":"Structure, Spectral Characteristics, and Phase Transitions in the Rb3CoCl4NO3 Crystal","authors":"A. V. Gudymenko,&nbsp;V. A. Komornikov,&nbsp;N. I. Sorokina,&nbsp;T. A. Sorokin,&nbsp;I. S. Timakov,&nbsp;D. S. Matveeva,&nbsp;A. E. Voloshin","doi":"10.1134/S1063774524602089","DOIUrl":"10.1134/S1063774524602089","url":null,"abstract":"<p>Rb₃CoCl₄NO₃ samples applicable for studying spectral characteristics have been obtained for the first time and investigated in the wavelength range λ = 200–800 nm. Transparency windows are found at the UV–visible and visible–IR boundaries. Differential-scanning calorimetry/thermogravimetry analysis revealed that the Rb₃CoCl₄NO₃ crystal is thermally stable, melts without decomposition, and undergoes two reversible phase transitions. The structure of Rb₃CoCl₄NO₃ single crystals was studied by X-ray diffraction in the temperature range of 293–625 K.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1035 - 1044"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423130","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":"Linear and Nonlinear Dielectric Response of VDF60/Tr40 Copolymer in the Vicinity of Ferroelectric Phase Transition","authors":"K. A. Verkhovskaya,&nbsp;M. A. Pankova,&nbsp;I. I. Popov,&nbsp;L. N. Korotkov","doi":"10.1134/S1063774524602260","DOIUrl":"10.1134/S1063774524602260","url":null,"abstract":"<p>The effect of the bias electric field <i>E</i>₌ (0–10 kV/cm) on the dielectric properties of the VDF₆₀/Tr₄₀ copolymer was studied in the temperature range of 20–110°C. It was found that the dielectric nonlinearity Δε is negative in the polar phase and becomes positive above the Curie temperature (<i>T</i>_C). The increase in <i>T</i>_C under the field <i>E</i>₌ is not uniform. At <i>E</i>₌ &lt; <i>E</i>_<i>c</i> (<i>E</i>_<i>c</i> is the threshold field), the Curie temperature is practically independent of <i>E</i>₌. At <i>E</i>₌ &gt; <i>E</i>_<i>c</i>, an increase in <i>T</i>_C is observed. The presence of the threshold field indicates the existence of sources of random electric fields in the material under study. It is suggested that they are responsible for the smearing of the ferroelectric phase transition.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"886 - 891"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423421","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":"Retraction Note: Investigation of the Influence of Electron Irradiation on the Properties of Cobalt Nanotubes","authors":"D. I. Shlimas,&nbsp;A. L. Kozlovskiy,&nbsp;M. V. Zdorovets,&nbsp;K. K. Kadyrzhanov,&nbsp;V. V. Uglov,&nbsp;E. E. Shumskaya,&nbsp;E. Y. Kaniukov","doi":"10.1134/S1063774524060026","DOIUrl":"10.1134/S1063774524060026","url":null,"abstract":"","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"1008 - 1008"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423488","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":"Solid Solutions CaMo(1–x)WxO4: Simulation of Properties and Local Environment of Ions","authors":"V. B. Dudnikova,&nbsp;N. N. Eremin","doi":"10.1134/S106377452460159X","DOIUrl":"10.1134/S106377452460159X","url":null,"abstract":"<p>CaMo<span>(_{{(1-x)}})</span>W_<i>x</i>O₄ solid solutions have been simulated using the interatomic potential method. The dependences of the unit-cell parameters and volume, density, bulk modulus, enthalpy, vibrational entropy, and heat capacity on the composition were determined, and temperature dependences of the heat capacity and vibrational entropy were plotted. The local structure of the solid solutions was investigated. The coordination polyhedra СаО₈, as well as МоО₄ and WO₄ tetrahedra, were found to change with variation in the solid solution concentration. It is shown that all polyhedra are additionally distorted in intermediate compositions, which may be a cause of the improvement of the spectral characteristics of mixed compositions.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1011 - 1018"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423127","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":"Experimental Study of the Method of X-ray Phase-Contrast Microscopy Using a Nanofocusing Lens at KISI-Kurchatov Synchrotron Source","authors":"M. S. Folomeshkin,&nbsp;V. G. Kohn,&nbsp;A. Yu. Seregin,&nbsp;Yu. A. Volkovsky,&nbsp;P. A. Prosekov,&nbsp;V. A. Yunkin,&nbsp;A. A. Snigirev,&nbsp;Yu. V. Pisarevsky,&nbsp;A. E. Blagov,&nbsp;M. V. Kovalchuk","doi":"10.1134/S1063774524602429","DOIUrl":"10.1134/S1063774524602429","url":null,"abstract":"<p>The results of the experimental study at the KISI-Kurchatov synchrotron source of the new phase-contrast imaging scheme for micro-objects using a nanofocusing compound refractive lens are presented. Visualization with submicron spatial resolution of a Fresnel zone plate with the width of the outer zones less than 0.5 µm is demonstrated. It is found that in the performed experiments the main contribution to the instrumental function, which limits the spatial resolution, is due to the vibrations of the optical scheme elements. The possibility of using the proposed scheme for estimating the beam transverse size at the focus of the compound refractive lens, with allowance for the instrumental function, is demonstrated.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"787 - 793"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423321","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":"Characterization of Annealed Proton Exchange Waveguides in Mixed Lithium Niobate-tantalate Solid Solution","authors":"A. V. Sosunov,&nbsp;I. V. Petukhov,&nbsp;A. R. Kornilicyn,&nbsp;A. A. Mololkin,&nbsp;R. R. Fahrtdinov,&nbsp;M. Kuneva","doi":"10.1134/S1063774524601825","DOIUrl":"10.1134/S1063774524601825","url":null,"abstract":"<p>The new lithium niobate-tantalate hybrid optical material platform can be used for special tasks in integrated photonics: waveguides, periodical poling, modulators and sensors. A comparison of structure and optical characteristics was performed between optical waveguides obtained by annealed proton exchange in lithium niobate (LN) and mixed lithium niobate-tantalate (LNT) solid solutions. The prism coupling method, IR-spectroscopy and X-ray diffraction were used to study the annealed proton exchange waveguides. The calculated increment of refractive index after proton exchange was 0.129 for LNT compared to 0.112 for LN. This unusual high increase of the refractive index of LNT is likely due to the presence of both compressive and tensile deformations of the crystal lattice of LNT as a result of proton exchange. The results of IR-spectroscopy indicate a more intense proton exchange in mixed crystals, which leads to greater structural disorder, in contrast to LN. The diffusion coefficients are higher for LNT unlike LN crystals and annealing relaxation of crystal lattice stresses is faster, subsequently. This is the first report on using proton exchange technology for optical waveguides fabrication in LNT solid solutions.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1115 - 1120"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423419","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":"Features of Interlayer Interfaces in Transparent Conducting Oxide/Metal/Oxide Trilayer Structures","authors":"A. Sh. Asvarov,&nbsp;A. K. Akhmedov,&nbsp;E. K. Murliev,&nbsp;A. Kh. Abduev,&nbsp;V. M. Kanevsky","doi":"10.1134/S1063774524602004","DOIUrl":"10.1134/S1063774524602004","url":null,"abstract":"<p>A comparative study of the growth processes, microstructures, and electrical characteristics of oxide/metal/oxide trilayer structures of different compositions synthesized at 50°C by rf magnetron sputtering in argon has been performed. The effect of subsequent annealing in an open atmosphere on the conductivity of the structures has been investigated. Transmission electron microscopy and energy-dispersive X-ray spectroscopy have been used to examine changes in the microstructure and profiles of distribution of chemical elements included in the structures under annealing. Based on the results obtained, mechanisms have been proposed for the transformation of interlayer interfaces and conditions of carrier transport in the structures, depending on the composition of the oxide and metallic layers comprising them.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1144 - 1149"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423381","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":"Retraction Note: Study of the Reactivity of Ni Nanotubes in Media with Different рН","authors":"G. Kalkabay,&nbsp;A. L. Kozlovskiy,&nbsp;M. A. Ibragimova,&nbsp;D. I. Shlimas,&nbsp;M. V. Zdorovets,&nbsp;D. B. Borgekov,&nbsp;A. V. Tikhonov","doi":"10.1134/S1063774524060038","DOIUrl":"10.1134/S1063774524060038","url":null,"abstract":"","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"1009 - 1009"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423490","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":"Impurity and γ-Stimulated Effect of Increasing the Transparency of CaF2 Crystals in the Fundamental Edge Region","authors":"S. E. Sarkisov,&nbsp;V. A. Yusim,&nbsp;Yu. V. Pisarevsky","doi":"10.1134/S1063774524601874","DOIUrl":"10.1134/S1063774524601874","url":null,"abstract":"<p>A comparison of absorption spectra revealed activator rare-earth ions at which the effect of impurity and radiation-induced decrease in the optical density at a wavelength of the short-wavelength edge of CaF₂ was observed; this effect is explained by the shift of the interband absorption of the crystal to the spectral vacuum UV region. Experiments showed that a multiple increase in the transparency of CaF₂ in the wavelength range of 190–200 nm occurs when doping crystals with ions of europium and ytterbium—elements having the lowest chemical potentials in the lanthanide series. This feature determines the ability of Eu³⁺ and Yb³⁺ to charge conversion of the oxidation state (+3 → +2). The absorption spectra of these ions were compared with the spectra of Nd³⁺ and Er³⁺ ions, which do not exhibit any changes in charge upon γ irradiation of CaF₂ crystals and have chemical potentials comparable in magnitude with those of other elements of the series, for which this parameter is 2–5 times larger than for Eu and Yb. The spectral features of the absorption of gadolinium ions were additionally investigated in a simple CaF₂ : 2 mol % GdF₃ crystal and a solid solution based on CaF₂ with addition of 10 mol % GdF₃ with the empirical formula Ca_0.9Gd_0.1F_2.1. A peculiarity of Gd is that, in contrast to other rare-earth elements, its ground energy 4<i>f</i> levels in the tri- and divalent states are located, respectively, on the top of the valence band and above the bottom of the conduction band. CaF₂ : 0.1 mol % Eu²⁺ crystals are proposed as an optical medium almost completely transparent in the wavelength range of 190–200 nm. The revealed effect is of interest for designing optical materials for systems of near-Earth and space monitoring for environmental and military purposes, as well as for the production of lenses applied in UV microphotolithography systems.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 7","pages":"1121 - 1130"},"PeriodicalIF":0.6,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423025","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}