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  • 1
    Electronic Resource
    Electronic Resource
    Elastic, piezoelectric, and dielectric properties of α-GeO2 single crystals (2000)
    Springer
    Crystallography reports 45 (2000), S. 145-147 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The elastic, piezoelectric, and dielectric characteristics of α-GeO2 crystals are studied at room temperature. The measurements were performed by the resonance method on crystals grown on α-quartz seeds from solutions in the recirculating mode. In germanium dioxide crystals, the piezoelectric moduli have high values. The characteristic features of variations of the electromechanical and elastic properties in crystals with the quartzlike structure observed earlier are confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.171151
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of loparite (2000)
    Springer
    Crystallography reports 45 (2000), S. 210-214 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the cubic modification of the natural mineral loparite has been studied for the first time by the methods of the X-ray diffraction analysis (γMoK α radiation, 105 independent reflections with I 〉 3σ(I), R = 0.041 in the anisotropic approximation). The structure belongs to the perovskite type (ABO 3) with the double period of the cubic unit cell, a = 7.767(1) Å (sp. gr. Pn3m; Z = 2 for the composition (Ca,Na,Ce)(Na,Ce)3(Ti,Nb)2Ti2O12. Period doubling is explained by ordering of cations both in the A and the B positions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.171165
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  • 3
    Electronic Resource
    Electronic Resource
    New boron-oxygen layer in the structure of barium hydrodecaborate Ba5[B20O33(OH)4] ⋅ H2O (2000)
    Springer
    Crystallography reports 45 (2000), S. 405-409 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the new synthetic compound Ba5[B20O33(OH)4] ⋅ H2O was established by the methods of X-ray diffraction (a Stoe IPDS diffractometer, λMoK α?, 1860 independent reflections, anisotropic refinement, R = 1.95%, localization of hydrogen atoms): a = 9.495(2) Å, b = 6.713(1) Å, c = 11.709(2) Å, β = 95.09(1)°, sp. gr. P2, Z = 1. The structure is based on double pseudohexagonal layers consisting of BO4-tetrahedra and BO3 triangles linked into three-membered rings in two mutually perpendicular directions. The double layers adjacent along the [100] direction are linked together through the Ba-polyhedra and hydrogen bonds with the participation of the OH-groups occupying the “end” vertices of two B-triangles. The interlayer space is also filled with a sheet of Ba-polyhedra. The structure of the compound is compared to the structures of topologically similar Ba and Ca borates and hydroborates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.171207
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure of strontium hilgardite (2000)
    Springer
    Crystallography reports 45 (2000), S. 410-415 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of strontium hilgardite, CaSr[B5O9]Cl ⋅ H2O, was established by the method of X-ray diffraction analysis (synchrotron radiation; diffractometer equipped with a position-sensitive detector; λ = 0.688 Å; 3191 reflections with F 〈 4σ(F); R = 0.045 in the anisotropic approximation). The triclinic unit-cell parameters are as follows: a = 6.5732(6) Å, b = 6.4445(6) Å, c = 6.3693(6) Å, α = 60.995(2)°, β = 61.257(2)°, γ = 77.191(2)°, sp. gr. P1; Z = 1. The Ca and Sr atoms were found to be disordered over two positions. The structures of strontium hilgardite and hilgardite-1A differ in the configurations of the seven-vertex Sr-and Ca(2)-polyhedra. The structure solved in this work is consistent with two series of borates studied previously. One of these groups involves pentaborates with different degrees of hydration of borate complexes, and the second group includes Sr-containing borates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.171208
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