Abstract
The results of studying the thermal behavior of natural boron albite–reedmergnerite NaBSi3O8 and aqueous boricilicate–searlesite NaBSi2O5(OH)2 obtained by the method of hydrothermal synthesis are presented. In the investigated temperature range, reedmergnerite (30–780°C) does not undergo phase transformations. Thermal expansion is sharply anisotropic, which is a characteristic feature of the expansion of feldspars. Aqueous borosilicate searlesite (25–750°C) is amorphized above 400°C as a result of dehydration and cristobalite crystallizes from the amorphous phase. The expansion of searlesite is relatively isotropic.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bubnova, R.S., Vysokotemperaturnaya kristallokhimiya boratov i borosilikatov (High Temperature Crystal Chemistry of Borates and Borosilicates), Bubnov, R.S. and Filatov, S.K., Eds., St. Petersburg: Nauka, 2008.
Sokolova, E.V., Hawthorne, F.C., and Khomyakov, A.P., The crystal chemistry of malinkoite, NaBSiO4, and lisitsynite, KBS2O6, from the Khibina-Lovozero complex, Kola Penisula, Russia, Can. Miner., 2001, vol. 39, pp. 159–169.
Graetsch, H.A. and Schreyer, W., Rietveld refinement of synthetic monoclinic NaBSiO4, Can. Miner., 2005, vol. 43, pp. 759–767.
Applemann, D.E. and Clark, J.R., Crystal structure of reedmergenite, a boron albite and its relation to feldspar crystal chemistry, Am. Mineral., 1965, vol. 50, nos. 1–2, pp. 1827–1850.
Pekov, I.V., Lovozerskii massiv: istoriya issledovaniya, pegmatity, mineraly (Lovozero Massif: History of Research, Pegmatites, Minerals), Moscow: Zemlya, 2001.
Kravchenko, V.B., The crystal structure of searlesite, NaBSi2O6(OH)2, Sov. Phys. Crystallogr., 1964, vol. 9, no. 2, pp. 143–148.
Bruker ASX, Topas 4.2, General Profile and Structure Analysis Software for Powder Diffraction Data, Karlsruhe, Germany, 2009.
Bubnova, R.S., Firsova, V.A., and Filatov, S.K., Software for determining the thermal expansion tensor and the graphic representation of its characteristic surface (Theta to Tensor-TTT), Glass Phys. Chem., 2013, vol. 39, no. 3, p. 347.
Krzhizhanovskaya, M.G., A new borosilicate feldspat, KBSi3O8: Synthesis, crystal structure and thermal behavior, Z. Kristallogr., 2012, vol. 227, pp. 446–451.
Tribaudino, M. and Marco, B., Thermoelastic and thermodynamic properties of plagioclase feldspars from thermal expansion measurements, Am. Mineral., 2011, vol. 96, pp. 992–1002.
Tribaudino, M., Angel, R.J., Cámara, F., Nestola, F., Pasqual, D., and Margiolaki, I., Thermal expansion of plagioclase feldspars, Contrib. Mineral Petrol., 2010, vol. 160, pp. 899–908.
Paufler, P. and Weber, T., On the determination of linear thermal expansion coefficients of triclinic crystals using X-ray diffraction, Eur. J. Mineral., 1999, vol. 11, no. 4, pp. 721–730.
Filatov, S.K., Vysokotemperaturnaya kristallokhimiya (High Temperature Crystal Chemistry), Leningrad: Nedra, 1990.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © E.S. Derkacheva, M.G. Krzhizhanovskaya, R.S. Bubnova, 2017, published in Fizika i Khimiya Stekla.
Rights and permissions
About this article
Cite this article
Derkacheva, E.S., Krzhizhanovskaya, M.G. & Bubnova, R.S. Thermal behavior of reedmergnerite NaBSi3O8 and searlesite NaBSi2O5(OH)2 . Glass Phys Chem 43, 459–463 (2017). https://doi.org/10.1134/S1087659617050030
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1087659617050030