Thermal and Sintering Behaviour of Basalt Glasses and Natural Basalt Powders |
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| Authors: | J Ma Rincon J Cáceres C J González-Oliver D O Russo A Petkova H Hristov |
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| Institution: | (1) The Glass-ceramics Laboratory, Institute E. Torroja de CC. Construcción, CSIC, Madrid, Spain;(2) División de Física, Centro Atómico de Bariloche, S. C. de Bariloche, Argentina;(3) Izida, Elin Pelin;(4) Applied Mineralogy Institute, The Bulgarian Academy of Sciences, Sofia, Bulgaria |
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| Abstract: | A study of three Spanish and one Bulgarian basaltic rock demonstrated that, after thermal treatment at temperatures higher
than 800°C, crystallization of pyroxenes, anorthite and magnetic occurred. Following sintering of the original basalts and
powdered original glasses, the same crystalline phases were nucleated and grown in the resulting glass-ceramics. Chemical
and DTA/TG analyses suggested similar behaviour for the synthesized Canarian basalt glasses, which are located in the tephrite-basanite
field, and different behaviour for the trachy-andesite Canarian and the basaltic-andesite Bulgarian basalt glass. In consequence
of the high sensitivity of the specific heat to phase transformations, Cp(T) and TMA experiments allowed a distinction between the tephrite-basanite and trachy-andesite Canarian glasses on the basis
of their different thermal behaviour.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | Bulgarian basalt glass-ceramics glasses heat capacity Spanish basalts thermal methods |
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