High-temperature behavior of axinite-(Mn), kornerupine and leucosphenite

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In situ high-temperature powder X-ray diffraction (HTPXRD) and differential scanning calorimetry (DSC) of three natural borosilicates have been performed in the temperature range of 25—1200 °С. Axinite-(Mn) melts incongruently at 900 °С forming anorthite and bustamite. Leucosphenite decomposes at 850 °С to fresnoite and cristobalite. According to DSC data, kornerupine decomposes at 1177 °С and sapphirine, indialite, and spinel were observed as the products of kornerupine heating. The calculation and orientation of thermal expansion tensor have been performed using HTPXRD data. The study showed that the borosilicates expand weakly and almost isotropically. The average volumetric thermal expansion coefficients are 21.3, 22.7, and 32.9 ∙ 10–6 °C–1 for axinite-(Mn), kornerupine, and leucosphenite, respectively. Leucosphenite has a maximum volumetric expansion most likely due to the pronounced layered character of the crystal structure. The least symmetric structure of axinite-(Mn) has the maximal anisotropy of thermal expansion in the temperature range of 600—900 °C. 

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作者简介

Maria Krzhizhanovskaya

Saint-Petersburg State University

编辑信件的主要联系方式.
Email: mariya.krzhizhanovskaya@spbu.ru
ORCID iD: 0000-0002-1380-7458
Scopus 作者 ID: 6602302951
Researcher ID: K-7045-2013

Assistant Professor of Crystallography Department, Institute of Earth Sciences

俄罗斯联邦, 199034, St. Petersburg, University Emb., 7/9

Vera Firsova

Institute of Silicate Chemistry of Russian Academy of Sciences

Email: va_firsova@mail.ru

Senior Scientist

俄罗斯联邦, 199034, St.Petersburg, Makarova Emb, 2

Rimma Bubnova

Institute of Silicate Chemistry of Russian Academy of Sciences

Email: rimma_bubnova@mail.ru

Head of Structural Chemistry Lab.

俄罗斯联邦, 199034, St.Petersburg, Makarova Emb, 2

Sergei Britvin

Saint-Petersburg State University

Email: sergei.britvin@spbu.ru

Professor, Crystallography Department, Institute of Earth Sciences

俄罗斯联邦, 199034, St. Petersburg, University Emb., 7/9

Olga Bubnova

Saint-Petersburg State University

Email: olga.bubnova@spbu.ru

Leading Researcher of XRD center

俄罗斯联邦, 199034, St. Petersburg, University Emb., 7/9

Igor Pekov

Moscow State University

Email: igorpekov@mail.ru

Professor, Mineralogy Department, Geological Feculty

俄罗斯联邦, 119991, Москва, Воробьевы горы

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