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Radiochemistry

, Volume 46, Issue 5, pp 438–440 | Cite as

Phase transitions and high-temperature crystal chemistry of polymorphous modifications of Cs2(UO2)2(MoO4)

  • E. V. Nazarchuk
  • S. V. Krivovichev
  • S. K. Filatov
Article

Abstract

Phase transitions and thermal deformations of α- and β-Cs2(UO2)2(MoO4)3 were studied by high-temperature X-ray diffraction analysis. In heating of α-Cs2(UO2)2(MoO4)3 to 625 ± 25°C, the reconstructive phase transition α → β proceeds. β -Cs2(UO2)2(MoO4)3 is stable up to 700 ±25°C. The thermal expansion of both phases is sharply anisotropic: α11 = 10 × 10−6, α22 = 33 × 10−6, α 33 = 10 × 10−6, αV = 53 × 10−6 deg−1 for α -Cs(UO2)2(MoO4)3 and α11 = 13 × 10−6, α33 = 3 × 10−6, αV = 31 × 10−6 deg−1 for β-Cs2 (UO2)2 (MoO4)3. The anisotropy of thermal expansion is explained by features of the crystal structure of the compounds.

Keywords

Anisotropy Crystal Structure Phase Transition Thermal Expansion Diffraction Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2004

Authors and Affiliations

  • E. V. Nazarchuk
    • 1
  • S. V. Krivovichev
    • 1
  • S. K. Filatov
    • 1
  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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