Journal•ISSN: 1063-7745
Crystallography Reports
MAIK Nauka/Interperiodica
About: Crystallography Reports is an academic journal published by MAIK Nauka/Interperiodica. The journal publishes majorly in the area(s): Crystal structure & Crystal. It has an ISSN identifier of 1063-7745. Over the lifetime, 4465 publications have been published receiving 22055 citations. The journal is also known as: Crystallography.
Topics: Crystal structure, Crystal, X-ray crystallography, Crystallization, Monoclinic crystal system
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TL;DR: The theory and experimental characteristics of the bulk photovoltaic effect in ferroelectric and piezoelectric crystals first observed at the Institute of Crystallography have been reviewed in this article.
Abstract: The theory and the experimental characteristics of the bulk photovoltaic effect in ferroelectric and piezoelectric crystals first observed at the Institute of Crystallography have been reviewed. I dedicate this review to the memory of B.K. Vainshtein whose help in performing these works was really inestimable.
269 citations
TL;DR: In this article, the crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 A resolution, respectively.
Abstract: The crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 A resolution, respectively. The atomic models of the molecules were refined to the R factors 9.8 and 10%, respectively. The three-dimensional molecular structures are characterized in detail. The analysis of electron-density distributions in the active centers of the native and inhibited enzyme forms revealed that the most flexible side chains of the amino acid residues Lys162 and Glu36 exist in two interrelated conformations. This allowed us to obtain the structural data necessary for understanding the mechanism of enzymatic activity of the dimanganese catalase.
131 citations
TL;DR: In this paper, it is shown that the shear deformations of polymers are characterized by a strong piezoelectric response, which is made by the size effect and electrostriction, which are related to each other.
Abstract: The piezoelectricity observed in poly(vinylidene fluoride) (PVDF) and its copolymers involves three components that are associated with the presence of at least two phases (crystalline and amorphous) in the polymer structure. The main contributions to the phenomenon observed are made by the size effect and electrostriction, which are related to each other. These contributions manifest themselves through the mechanism of strain-induced reversible transformations of a number of domains of the anisotropic amorphous phase into the crystalline state under the action of mechanical or electrical fields. With due regard for different packings of chains in the amorphous and crystalline phases, this mechanism accounts for the large Poisson ratios μ31 obtained for textured films of flexible-chain crystallizing polymers. The dependence of the piezoelectric coefficient d
32 on the static stress in textured films is governed by the change in the fraction of the crystalline phase due to strong anisotropy of the elastic constants in the film plane. It is shown that the shear deformations of polymers are characterized by a strong piezoelectric response. The specific features revealed in the piezoelectric effect under bending deformations are described for films with an inhomogeneous distribution of polarization over the cross section. The general regularities of the electrostriction in the polymers and inorganic relaxor ferroelectrics studied are considered.
123 citations
TL;DR: In this paper, the Ruddlesden-Popper phase was analyzed in terms of crystal chemistry and the geometrical boundaries of the existence ranges of these compounds with multilayer stacks were determined and new phases of this type were predicted.
Abstract: The layer perovskite-like structures of the so-called Ruddlesden-Popper phases have been analyzed in terms of crystal chemistry. The geometrical boundaries of the existence ranges of these compounds with multilayer stacks are determined and new phases of this type are predicted. The possible variants of related structures are also considered.
123 citations
TL;DR: In this article, the authors described the solid electrolytes with fluorine-ion conductivity that were revealed during the analysis of the phase diagrams of the MF 2 -RF 3 systems within the program of search for new multicomponent fluor crystalline materials carried out at the Shubnikov Institute of Crystallography, Russian Academy of Sciences.
Abstract: The solid electrolytes with fluorine-ion conductivity that were revealed during the analysis of the phase diagrams of the MF
m
-RF
n
systems within the program of search for new multicomponent fluoride crystalline materials carried out at the Shubnikov Institute of Crystallography, Russian Academy of Sciences, are described. The most widespread and promising materials are the nonstoichiometric phases with fluorite (CaF2) and tysonite (LaF3) structures, which are formed in the MF2-RF3 systems (M = Ca, Sr, Ba, Cd, or Pb; R = Sc, Y, or La-Lu). These phases have superionic fluorine conductivity due to the anion sublattice disorder. The ionic conductivity of crystals of both structure types has been studied and the limits of its change with composition and temperature are determined. Nonstoichiometric fluorides are used as solid electrolytes in chemical sensors, fluorine sources, and batteries. The prospects of the use of fluorine-ion conductors in solid-state electrochemical devices, principles of their operation, and the problems of optimization of their composition are discussed.
120 citations