Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Crystal structure and thermal behaviour of boropollucite CsBSi 2O6. / Bubnova, R. S.; Stepanov, N. K.; Levin, A. A.; Filatov, S. K.; Paufler, P.; Meyer, D. C.
в: Solid State Sciences, Том 6, № 7, 01.07.2004, стр. 629-637.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Crystal structure and thermal behaviour of boropollucite CsBSi 2O6
AU - Bubnova, R. S.
AU - Stepanov, N. K.
AU - Levin, A. A.
AU - Filatov, S. K.
AU - Paufler, P.
AU - Meyer, D. C.
PY - 2004/7/1
Y1 - 2004/7/1
N2 - The crystal structure of Cs0.82B1.09Si 1.98O6 boropollucite at room temperature was determined by direct methods and refined in the Ia3̄d space group using an anisotropic approximation of atomic thermal displacements (a=13.009 (1) Å, Z=16, Rw=0.027, RF=0.037 for 141 independent observed (F≥4σF) reflections). The occupancy factors have been refined for Cs and tetrahedral positions assuming the oxygen sites being fully occupied. The compound is isostructural to leucite-pollucite high-temperature modification. Thermal behaviour of CsBSi2O6 was investigated by DTA and TG, annealing at different temperatures with following wet chemical analysis and high-temperature X-ray powder diffraction methods. The CsBSi2O6 cubic phase loses mass before melting and decomposes to form a new crystalline phase with close to CsBSi3O 8 stoichiometry in the temperature range of 1303-1353 K. Thermal expansion of two boropollucite samples, which differed in the number of Cs + and/or B3+ ions of a nominal composition CsBSi 2O6 was investigated in air as well as in vacuum. Temperature ranges of negative thermal expansion were found.
AB - The crystal structure of Cs0.82B1.09Si 1.98O6 boropollucite at room temperature was determined by direct methods and refined in the Ia3̄d space group using an anisotropic approximation of atomic thermal displacements (a=13.009 (1) Å, Z=16, Rw=0.027, RF=0.037 for 141 independent observed (F≥4σF) reflections). The occupancy factors have been refined for Cs and tetrahedral positions assuming the oxygen sites being fully occupied. The compound is isostructural to leucite-pollucite high-temperature modification. Thermal behaviour of CsBSi2O6 was investigated by DTA and TG, annealing at different temperatures with following wet chemical analysis and high-temperature X-ray powder diffraction methods. The CsBSi2O6 cubic phase loses mass before melting and decomposes to form a new crystalline phase with close to CsBSi3O 8 stoichiometry in the temperature range of 1303-1353 K. Thermal expansion of two boropollucite samples, which differed in the number of Cs + and/or B3+ ions of a nominal composition CsBSi 2O6 was investigated in air as well as in vacuum. Temperature ranges of negative thermal expansion were found.
KW - Boropollucite
KW - Borosilicate
KW - Crystal structure
KW - Feldspar composition
KW - Phase decomposition
KW - Thermal expansion
UR - http://www.scopus.com/inward/record.url?scp=3242679012&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2004.03.015
DO - 10.1016/j.solidstatesciences.2004.03.015
M3 - Article
AN - SCOPUS:3242679012
VL - 6
SP - 629
EP - 637
JO - Solid State Sciences
JF - Solid State Sciences
SN - 1293-2558
IS - 7
ER -
ID: 53951145