Thermal Behavior of Howlite, Ca2B5SiO9(OH)5
L. A. Gorelovaa, b, M. G. Krzhizhanovskayab, and R. S. Bubnovaa, b, *
Translated by G. Levit
aGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034 Russia
bSt. Petersburg State University, St. Petersburg, 199034 Russia
Correspondence to: *e-mail: rimma_bubnova@mail.ru
Received 17 April, 2017
Abstract—The thermal behavior of natural borosilicate howlite, Ca2B5SiO9(OH)5, is studied by the methods of high-temperature X-ray diffraction and differential thermal analysis in the temperature range of 30–1100°C. The thermal expansion is anisotropic (αmax/αmin = 3.6); the degree of anisotropy increases (αmax/αmin = 4.3) with a temperature increase up to 480°C (360–480°C).
Keywords: howlite, borosilicates, thermal expansion
DOI: 10.1134/S1087659617060037