Research output: Contribution to journal › Article › peer-review
The High-Temperature Behavior of Axinite-(Mn), Kornerupine, and Leucosphenite. / Krzhizhanovskaya, M. G.; Firsova, V. A.; Bubnova, R. S.; Britvin, S. N.; Bubnova, O. G.; Pekov, I. V.
In: Geology of Ore Deposits, Vol. 62, No. 8, 12.2020, p. 819-826.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The High-Temperature Behavior of Axinite-(Mn), Kornerupine, and Leucosphenite
AU - Krzhizhanovskaya, M. G.
AU - Firsova, V. A.
AU - Bubnova, R. S.
AU - Britvin, S. N.
AU - Bubnova, O. G.
AU - Pekov, I. V.
N1 - Funding Information: This study was supported by the Russian Foundation for Basic Research, project no. 17-03-00887. Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2020/12
Y1 - 2020/12
N2 - Abstract— In situ high-temperature powder X-ray diffraction (HTPXRD), differential scanning calorimetry (DSC), and thermogravimetry (TG) of three natural borosilicates have been performed in the temperature range of 25–1200°С. Axinite-(Mn) melts incongruently at 900°С with the formation of anorthite and bustamite. Leucosphenite decomposes at 850°С to form fresnoite and cristobalite. According to DSC data, kornerupine decomposes at 1177°С to form sapphirine, indialite, and spinel as the products of heating kornerupine. The values of the thermal expansion tensor and its orientation were determined using the HTPXRD data. The study showed that the three borosilicates expand weakly and almost isotropically. The average bulk thermal expansion coefficients are 21.3, 22.7, and 32.9 × 10–6°С–1 for axinite-(Mn), kornerupine, and leucosphenite, respectively. Leucosphenite has the maximum volumetric expansion, most likely due to the pronounced layered character of its crystal structure. The least symmetric structure of axinite-(Mn) has the maximum anisotropy of thermal expansion in the temperature range of 600–900°С.
AB - Abstract— In situ high-temperature powder X-ray diffraction (HTPXRD), differential scanning calorimetry (DSC), and thermogravimetry (TG) of three natural borosilicates have been performed in the temperature range of 25–1200°С. Axinite-(Mn) melts incongruently at 900°С with the formation of anorthite and bustamite. Leucosphenite decomposes at 850°С to form fresnoite and cristobalite. According to DSC data, kornerupine decomposes at 1177°С to form sapphirine, indialite, and spinel as the products of heating kornerupine. The values of the thermal expansion tensor and its orientation were determined using the HTPXRD data. The study showed that the three borosilicates expand weakly and almost isotropically. The average bulk thermal expansion coefficients are 21.3, 22.7, and 32.9 × 10–6°С–1 for axinite-(Mn), kornerupine, and leucosphenite, respectively. Leucosphenite has the maximum volumetric expansion, most likely due to the pronounced layered character of its crystal structure. The least symmetric structure of axinite-(Mn) has the maximum anisotropy of thermal expansion in the temperature range of 600–900°С.
KW - borosilicate
KW - high-temperature X-ray diffraction
KW - kornerupine
KW - leucosphenite
KW - thermal analysis
KW - thermal expansion
UR - http://www.scopus.com/inward/record.url?scp=85100825407&partnerID=8YFLogxK
U2 - 10.1134/S1075701520080085
DO - 10.1134/S1075701520080085
M3 - Article
AN - SCOPUS:85100825407
VL - 62
SP - 819
EP - 826
JO - Geology of Ore Deposits
JF - Geology of Ore Deposits
SN - 1075-7015
IS - 8
ER -
ID: 74449240