Abstract
Hydroxylclinohumite Mg5(SiO4)2(OH,F)2 is a common monoclinic orthosilicate of the humite group, which, on the one hand, is a prototype of promising materials, and, on the other hand, is an important source of information about both the transport and the presence of water in the Earth’s mantle, and therefore studying its thermal behavior is of particular interest. In this paper, the mineral is studied by powder X-ray diffraction for the first time in a wide temperature range (–180 ≤ T ≤ 1000°C). The temperature limits for the existence of the phase are established, the principal values of the thermal expansion tensor are calculated, and a structural interpretation of thermal expansion is given.
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ACKNOWLEDGMENTS
The X-ray experiments were performed using the equipment of the resource center of St. Petersburg State University “X-Ray Diffraction Methods of Research.”
Funding
The sampling for experiments and interpreting the X-ray data was carried out as part of a state task of the RF Ministry of Science and Higher Education RF (project no. 0081-2022-0002, Institute of Silicate Chemistry, Russian Academy of Sciences), and the generalization of the results of the X-ray experiments was supported by the Russian Science Foundation (project no. 22-13-00317).
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Biryukov, Y.P., Bubnova, R.S. & Firsova, V.A. Thermal Behavior (–180 ≤ T ≤ 1000°C) of Magnesium Orthosilicate Hydroxylclinohumite Mg5(SiO4)2(OH,F)2. Glass Phys Chem 49, 206–211 (2023). https://doi.org/10.1134/S1087659622601113
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DOI: https://doi.org/10.1134/S1087659622601113