Crystallization of Mg silicate dust

Abstract

Yamamoto. et al theoretically proposed that the chemical reaction heat between an amorphous silicate dust and the surface layer diffuses into the center of the dust and the crystallization temperature falls, which is corresponding to the Greenberg model. By covering Mg-bearing silicate dust with carbon layer, we found that crystallization temperature falls 200 degrees for crystallization of carbon surface layer. Here we showed that crystallization of Mg-bearing silicate dust coved with carbon in methane gas atmosphere at 10-3 torr progresses at room temperature.