ПОВЕДЕНИЕ ЛАМПРОФИЛЛИТА И БАРИТОЛАМПРОФИЛЛИТА ПРИ ВЫСОКИХ ТЕМПЕРАТУРАХ

Translated title of the contribution: High-temperature behavior of lamprophyllite and barytolamprophyllite

E. S. Zhitova, T. L. Panikorovskii, V. N. Yakovenchuk, M. G. Krzhizhanovskaya

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

According to the high-temperature X-ray powder diffraction data, lamprophyllite and barytolamprophylhte are stable up to 925 and 850 °C, respectively. The temperature of decomposition was defined for barytolamprophyllite by DSC and TGA methods as 897 °C. Analysis of the X-ray diffraction pattern during the heating has not detected any significant changes, implying the absence of phase transitions. Behavior of lamprophyllite and barytolamprophylhte at high-temperature is strongly anisotropic, thermal expansion coefficients (%10 6 ) along crystallographic axes at T = 200 °C are as following: a a = 12.6(6), a b = 7.7(1), a c = 4.4(2) °C-1 for lamprophyllite, and a a = 11.8(5), a b = 5.7(1), a c = 3.4(3) °C-1 for barytolamprophylhte. At T = 600 °C these values are a a = 15.2(5), a b = 7.7(1), a c = 2.2(2) °C-1 for lamprophyllite, and a a = 12.3(7), à b = 5.7(1), a c = -3.8(4) °C-1 for barytolamprophylhte. The contraction along the axis ñ was observed for barytolamprophyllite, but did not for lamprophyllite; it is caused by thermal oxidation of iron.

Translated title of the contributionHigh-temperature behavior of lamprophyllite and barytolamprophyllite
Original languageRussian
Pages (from-to)82-94
Number of pages13
JournalZapiski Rossiiskogo Mineralogicheskogo Obshchestva
Volume147
Issue number3
DOIs
StatePublished - 1 Jan 2018

Scopus subject areas

  • Geochemistry and Petrology
  • Geology
  • Economic Geology
  • Materials Chemistry

Keywords

  • Barytolamprophylhte
  • High-temperature X-ray diffraction
  • Lamprophyllite

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