Phase transitions and high-temperature crystal chemistry of polymorphous modifications of Cs2(UO2)2(MoO4) |
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| Authors: | E. V. Nazarchuk S. V. Krivovichev S. K. Filatov |
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| Affiliation: | (1) St. Petersburg State University, St. Petersburg, Russia |
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| Abstract: | Phase transitions and thermal deformations of  - and  -Cs2(UO2)2(MoO4)3 were studied by high-temperature X-ray diffraction analysis. In heating of -Cs2(UO2)2(MoO4)3 to 625 ± 25°C, the reconstructive phase transition  proceeds. -Cs2(UO2)2(MoO4)3 is stable up to 700 ±25°C. The thermal expansion of both phases is sharply anisotropic: 11 = 10 × 10–6, 22 = 33 × 10–6, 33 = 10 × 10–6, V = 53 × 10–6 deg–1 for -Cs(UO2)2(MoO4)3 and 11 = 13 × 10–6, 33 = 3 × 10–6, V = 31 × 10–6 deg–1 for -Cs2 (UO2)2 (MoO4)3. The anisotropy of thermal expansion is explained by features of the crystal structure of the compounds.Translated from Radiokhimiya, Vol. 46, No. 5, 2004, pp. 405–407.Original Russian Text Copyright © 2004 by Nazarchuk, Krivovichev, Filatov. |
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