ЧЕРМИГИТ ТЕРМАЛЬНЫХ ПОЛЕЙ ЮЖНОЙ КАМЧАТКИ: ВЫСОКОТЕМПЕРАТУРНОЕ ПРЕОБРАЗОВАНИЕ И ОСОБЕННОСТИ ИК-СПЕКТРА

Translated title of the contribution: Tschermigite from thermal fields of southern Kamchatka: High-temperature transformation and peculiarities of IR-spectrum

E. S. Zhitova, A. V. Sergeeva, A. A. Nuzhdaev, M. G. Krzhizhanovskaya, V. M. Chubarov

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Tschermigite, (NH4)Al(SO4)2 ∙ 12H2O, is a widespread mineral in efflorescence at geothermal fields associated with Kambalny and Koshelevsky volcanoes (Southern Kamchatka, Russia). The determined temperature ranges of stability of tschermigite and products of its high-temperature evolution by in situ powder X-ray diffraction: tschermigite (23-60°C) → X-ray amorphous phase (70-200 °C) → godovikovite (210-390°C) → millosevichite (380->620°C). This implies decomposition of tschermigite (23-60°C) first to the interim X-ray amorphous phase (probably melt) from which godovikovite is then formed, without direct transformation of tschermigite to godovikovite, as it was suggested in some papers previously. Deammonization of godovikovite to millosevichite occurs at 380-390°C. Thermal expansion coefficients are given for tschermigite, godovikovite and millosevichite with discussion on some peculiarities on their formation. Regarding IR bands that refer to ammonium ion: ν
Translated title of the contributionTschermigite from thermal fields of southern Kamchatka: High-temperature transformation and peculiarities of IR-spectrum
Original languageRussian
Pages (from-to)100-116
Number of pages17
JournalZapiski Rossiiskogo Mineralogicheskogo Obshchestva
Volume148
Issue number1
DOIs
StatePublished - 1 Jan 2019

Scopus subject areas

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

Keywords

  • godovikovite
  • High-temperature crystal chemistry
  • IR-spectroscopy
  • millosevichite
  • tschermigite
  • высокотемпературная кристаллохимия
  • годовиковит
  • ИК-спектроскопия
  • миллозевичит
  • чермигит

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