Thermally induced reversible phase transformations of boroleucite, KBSi2O6

Krzhizhanovskaya, M. G., Bubnova, R. S., Derkacheva, E. S., Depmeier, Wulf and Filatov, S. K. (2016) Thermally induced reversible phase transformations of boroleucite, KBSi2O6 European Journal of Mineralogy, 28 (1). pp. 15-21. DOI 10.1127/ejm/2015/0027-2505.

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Abstract

The high-temperature structural behaviour of the monoclinic and cubic phases of ANA-type boroleucite, KBSi2O6, was studied by X-ray powder diffraction. Boroleucite crystallizes with different symmetry depending on the method of preparation: the P2(1)/a monoclinic modification was obtained by dry high-pressure synthesis at 600 degrees C and 0.5 GPa, whereas the cubic I (4) over bar 3d phase was prepared by solid-state reaction at 700 degrees C, 1 bar, for 72 h. Both modifications undergo reversible transformations at higher temperatures, viz. P2(1)/a <-> (at 800 degrees C) Ia (3) over bar d and I (4) over bar 3d <-> (at 300 degrees C) P2(1)/a <-> (at 550 degrees C) Ia (3) over bar d, respectively. The values of the thermal-expansion coefficients are reported. The high-temperature Ia (3) over bar d modification of KBSi2O6 exhibits the lowest thermal expansion (6-10 x 10(-6) degrees C-1); it decomposes above 1000 degrees C with formation of SiO2.

Document Type: Article
Additional Information: Times Cited: 0 Krzhizhanovskaya, Maria G. Bubnova, Rimma S. Derkacheva, Elena S. Depmeier, Wulf Filatov, Stanislav K.
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1127/ejm/2015/0027-2505
ISSN: 0935-1221
Projects: Future Ocean
Date Deposited: 18 Mar 2017 12:02
Last Modified: 19 Dec 2017 12:46
URI: http://eprints.uni-kiel.de/id/eprint/36180

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