Advertisement

Radiochemistry

, Volume 58, Issue 1, pp 6–9 | Cite as

High-temperature crystal chemistry of Na6(UO2)2O(MoO4)4

  • E. V. Nazarchuk
  • O. I. Siidra
  • S. V. Krivovichev
Article

Abstract

Thermal deformations of Na6(UO2)2O(MoO4)4 were studied by high-temperature powder X-ray diffraction. The compound crystallizes in the triclinic system, space group Р \(\bar 1\), a = 7.636(7), b = 8.163(6), c = 8.746(4) Å, α = 72.32(9)°, β = 79.36(4)°, γ = 65.79(5)°, V = 472.74(4) Å3. It is stable in the temperature interval 20–700°С. The thermal expansion coefficients (TECs) are α11 = 25.5 × 10–6, α22 = 7.8 × 10–6, and α33 = 1.1 × 10–6 (°C)–1. The orientation of the TEC pattern relative to the crystallographic axes is a 33^Z = 45°, a 33^X = 122°, a 22^Z = 59°, and a 22^X = 66°. The anisotropy of the thermal expansion is due to specific features of the crystal structure of the compound.

Keywords

uranyl molybdates high-temperature X-ray diffraction thermal expansion 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Burns, P.C., Miller, M.L., and Ewing, R.C., Can. Mineral., 1996, vol. 34, pp. 845–880.Google Scholar
  2. 2.
    Burns, P.C. and Carpenter, M.A., Can. Mineral., 1996, vol. 34, pp. 881–892.Google Scholar
  3. 3.
    Burns, P.C., Hawthorne, F.C., and Ewing, R.C., Can. Mineral., 1997, vol. 35, pp. 1551–1570.Google Scholar
  4. 4.
    Burns, P.C., Ewing, R.C., and Miller, M.L., J. Nucl. Mater., 1997, vol. 245, pp. 1–9.CrossRefGoogle Scholar
  5. 5.
    Buck, B.C., Wronkiewicz, D.J., Finn, P.A., and Bates, J.K., J. Nucl. Mater., 1997, vol. 249, pp. 70–76.CrossRefGoogle Scholar
  6. 6.
    Finch, R.J. and Buck, E.C., Abstracts of Papers, Mater. Res. Soc. Fall Meet., 1998, pp. 723–725.Google Scholar
  7. 7.
    Nazarchuk, E.V., Krivovichev, S.V., and Filatov, S.K., Radiochemistry, 2004, vol. 46, no. 5, pp. 438–440.CrossRefGoogle Scholar
  8. 8.
    Siidra, O.I., Nazarchuk, E.V., Kayukov, R.A., et al., Z. Anorg. Allg. Chem., 2013, vol. 639, pp. 2302–2306.CrossRefGoogle Scholar
  9. 9.
    Dion, C. and Noël, H., Bull. Soc. Chim. Fr., 1981, vol. 1, pp. 371–376.Google Scholar
  10. 10.
    Krivovichev, S.V. and Burns, P.C., Can. Mineral., 2001, vol. 39, pp. 197–206.CrossRefGoogle Scholar
  11. 11.
    Krivovichev, S.V. and Burns, P.C., Can. Mineral., 2003, vol. 41, pp. 707–719.CrossRefGoogle Scholar
  12. 12.
    Structural Chemistry of Inorganic Actinide Compounds, Krivovichev, S.V., Burns, P.C., and Tananaev, I.G., Eds., Amsterdam: Elsevier, 2007, p. 494.Google Scholar
  13. 13.
    Filatov, S.K., Vysokotemperaturnaya kristallokhimiya (High-Temperature Crystal Chemistry), Leningrad: Nedra, 1990, p. 288.Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2016

Authors and Affiliations

  • E. V. Nazarchuk
    • 1
  • O. I. Siidra
    • 1
  • S. V. Krivovichev
    • 1
  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

Personalised recommendations