ЧЕРМИГИТ ТЕРМАЛЬНЫХ ПОЛЕЙ ЮЖНОЙ КАМЧАТКИ

ВЫСОКОТЕМПЕРАТУРНОЕ ПРЕОБРАЗОВАНИЕ И ОСОБЕННОСТИ ИК-СПЕКТРА

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

Research outputpeer-review

Abstract

Tschermigite, (NH 4 )Al(SO 4 ) 2 ∙ 12H 2 O, 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 3 (~1430 cm -1 ) split, ν 1 (~3100 cm -1 ) active, what attests about at least partial shift of N (NH 4 + ) in tschermigite crystal structure from site 4b (S 6 ) to site 8c (С 3 ). In O-H stretching region, higher wavenumber band (~3380 cm -1 ) corresponds to «extraframework» water, while the observed band ~2950 cm -1 corresponds to water coordinating Al.

Original languageRussian
Pages (from-to)100-116
Number of pages17
JournalZapiski Rossiiskogo Mineralogicheskogo Obshchestva
Volume148
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Efflorescence
Geothermal fields
X rays
Volcanoes
Water
thermal expansion
Ammonium Compounds
crystal structure
X ray powder diffraction
Stretching
Thermal expansion
Minerals
ammonium
volcano
Crystal structure
X-ray diffraction
melt
Ions
decomposition
Decomposition

Scopus subject areas

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

Cite this

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title = "ЧЕРМИГИТ ТЕРМАЛЬНЫХ ПОЛЕЙ ЮЖНОЙ КАМЧАТКИ: ВЫСОКОТЕМПЕРАТУРНОЕ ПРЕОБРАЗОВАНИЕ И ОСОБЕННОСТИ ИК-СПЕКТРА",
abstract = "Tschermigite, (NH 4 )Al(SO 4 ) 2 ∙ 12H 2 O, 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 3 (~1430 cm -1 ) split, ν 1 (~3100 cm -1 ) active, what attests about at least partial shift of N (NH 4 + ) in tschermigite crystal structure from site 4b (S 6 ) to site 8c (С 3 ). In O-H stretching region, higher wavenumber band (~3380 cm -1 ) corresponds to «extraframework» water, while the observed band ~2950 cm -1 corresponds to water coordinating Al.",
keywords = "Godovikovite, High-temperature crystal chemistry, IR-spectroscopy, Millosevichite, Tschermigite",
author = "Zhitova, {E. S.} and Sergeeva, {A. V.} and Nuzhdaev, {A. A.} and Krzhizhanovskaya, {M. G.} and Chubarov, {V. M.}",
year = "2019",
month = "1",
day = "1",
doi = "10.30695/zrmo/2019.1481.08",
language = "русский",
volume = "148",
pages = "100--116",
journal = "ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА",
issn = "0869-6055",
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TY - JOUR

T1 - ЧЕРМИГИТ ТЕРМАЛЬНЫХ ПОЛЕЙ ЮЖНОЙ КАМЧАТКИ

T2 - ВЫСОКОТЕМПЕРАТУРНОЕ ПРЕОБРАЗОВАНИЕ И ОСОБЕННОСТИ ИК-СПЕКТРА

AU - Zhitova, E. S.

AU - Sergeeva, A. V.

AU - Nuzhdaev, A. A.

AU - Krzhizhanovskaya, M. G.

AU - Chubarov, V. M.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Tschermigite, (NH 4 )Al(SO 4 ) 2 ∙ 12H 2 O, 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 3 (~1430 cm -1 ) split, ν 1 (~3100 cm -1 ) active, what attests about at least partial shift of N (NH 4 + ) in tschermigite crystal structure from site 4b (S 6 ) to site 8c (С 3 ). In O-H stretching region, higher wavenumber band (~3380 cm -1 ) corresponds to «extraframework» water, while the observed band ~2950 cm -1 corresponds to water coordinating Al.

AB - Tschermigite, (NH 4 )Al(SO 4 ) 2 ∙ 12H 2 O, 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 3 (~1430 cm -1 ) split, ν 1 (~3100 cm -1 ) active, what attests about at least partial shift of N (NH 4 + ) in tschermigite crystal structure from site 4b (S 6 ) to site 8c (С 3 ). In O-H stretching region, higher wavenumber band (~3380 cm -1 ) corresponds to «extraframework» water, while the observed band ~2950 cm -1 corresponds to water coordinating Al.

KW - Godovikovite

KW - High-temperature crystal chemistry

KW - IR-spectroscopy

KW - Millosevichite

KW - Tschermigite

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U2 - 10.30695/zrmo/2019.1481.08

DO - 10.30695/zrmo/2019.1481.08

M3 - статья

VL - 148

SP - 100

EP - 116

JO - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА

JF - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА

SN - 0869-6055

IS - 1

ER -