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30 citations found for Arakcheeva, A.

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Acta Cryst. (2017). A73, C1416
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Acta Cryst. (2004). A60, s182
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The new incommensurately modulated scheelite-like structure of KSm(MoO4)2 with partially disordered K and Sm has been refined by the Rietveld method. Anisotropic microstrain line-broadening has been applied to the profile refinement of the powder diffraction measurement. The fit is greatly improved in comparison with standard isotropic line-broadening.

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The interactions between C atoms and Na ions can be directly associated with the phase transitions in sodium carbonate, Na2CO3. By lowering the temperature, the coordination number of the C atoms increases from 3 to 7 in the second coordination sphere. The behavior of the carbonate ion is influenced by the neighbouring Na ions.

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A structural study of methyl­ammonium lead triiodide [CH3NH3PbI3 (MAPbI3)], at high pressures up to 20 GPa using noble gases Ne and Ar as pressure-transmitting media is reported. It is found that both noble gases are chemically active at high pressures. In particular, Ne stabilizes the high-pressure structure of NexMAPbI3 and prevents amorphization up to 20 GPa. In contrast, Ar acts as a stabilizer only up to 2.4 GPa and accelerates irreversible amorphization upon further compression.

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Acta Cryst. (2008). A64, C618
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The complementary character of the first and second coordination-sphere interactions is illustrated with the incommensurately modulated structure [beta]-K5Yb(MoO4)4. It is also shown that even the third coordination sphere should not be neglected in the studies of modulated structures.

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An efficient method for modelling a polytypic family is presented with the example of cimetidine in the form C polymorph. The method exploits the (3 + 1)-dimensional superspace model, which is a powerful tool for the description, prediction and understanding of polytype modifications in small-molecule crystallography, as illustrated with this pharmaceutical example.

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Acta Cryst. (2005). A61, c49
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Using single-crystal synchrotron radiation X-ray experiments, the host–guest structure of the Ba IVb high-pressure phase has been solved for the first time. The proposed systematic analysis of possible host–guest structure models shows that the structure belongs to the incommensurately modulated type. This model reveals an atomic density wave and its pressure-dependent evolution between 16.5 and 19.6 GPa.

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Acta Cryst. (2009). A65, s48
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Acta Cryst. (2002). A58, c179
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Based on the superspace approach we present a method to generate a family of modular structures, provided that one of its members exhibits an incommensurately modulated (i.e. aperiodic) structure. This approach, which relies on the variation of the modulation vector q, is illustrated with the generation of the K5Yb(MoO4)4 family and the analysis of its temperature-dependent phase transformations.

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KTa_{1\ +\ z}O3, an oxide bronze, has been synthesized by electrolytic crystallization. The high-resolution anharmonic crystal structure refinement reveals the presence of Ta2 dumb-bells in the KTaO3 matrix, which explain the semiconductor property.

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A (3 + d)-dimensional incommensurately modulated structure can be exploited as a natural superspace model for the generation, prediction and description of a (3 + d)-dimensional family consisting of both three-dimensional and (3 + d)-dimensional members. The capabilities and limitations of an incommensurately modulated structure to act as a natural superspace model for the generation of a family are illustrated with an example of the scheelite-like compound derived from the (3 + 1)-dimensional incommensurately modulated KNd(MoO4)2 structure.

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Acta Cryst. (2006). A62, s46
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The incommensurately modulated (3+1)-dimensional structure of K3In(PO4)2 has been refined from single-crystal X-ray diffraction data. The cation-cation interactions are used to explain the origin of the structure modulation. It is shown that this incommensurately modulated structure is the only phase that has been unequivocally identified at room temperature.

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In an electronically complex quasi-one-dimensional BaVS3 metal, a composite host–guest structure consisting of a BaS3 hcp matrix as the host and V-chains as the guest are identified. The composite structure was identified at 295 K and at around 130 K the two structural subsystems lock together. As a result, the crystal symmetry changes, implying a structural phase transition, which was overlooked before.


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Single crystals of tetragonal [beta]-Ta could be obtained from electrodeposition in a bath of molten fluorides. This [sigma]-phase-type structure has been refined in space group P\bar 421m from normal temperature and pressure X-ray data. This structure exhibits many features common to the high-pressure phases of BaIV, BiIII and RbIV.

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