Mechanochemical Synthesis of Amorphous Silicates with an Enstatite and Forsterite Composition

Abstract The presence of amorphous silicate particles in interstellar and circumstellar space has been suggested based on the observation 9.7 18 μ m emission bands. We have successfully synthesized samples an enstatite forsterite composition by mechanical milling mixed powder consisting SiO 2 –MgO –Mg(OH) reagent-grade under different rotation frequencies times. These two types starting materials are prepared to study effect OH bond synthesis crystallization. were characterized X-ray diffraction infrared spectroscopy. Amorphous with from both at 300 rpm for hr. . require 400 a long time 1600 After crystallization, mainly transform into small amounts silica depending time, while those become enstatite. crystallized materials. H O or bonds significantly affects final products after crystallization silicates composition.