Crystallisation of amorphous Mg-Fe silicates produced from microwave-dried sol-gels. Issue Volume 15:Issue S350(2019) (April 2019)

• Record Type: Journal Article
• Authors: Thompson, Stephen P.; Herlihy, Anna; Murray, Claire A.; Baker, Annabelle R.; Day, Sarah J.
• Editors: Salama, Farid; Linnartz, Harold
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S350(2019)
• Page Start: 408
• Page End: 409
• Publication Date: 2019-04
• Subjects: methods: laboratory, -- planetary systems: protoplanetary disks, -- ISM: dust, -- comets: general, -- infrared: general, -- X-rays: general; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319009360
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: Amorphous Mg-Fe silicates are produced from microwave-dried sol-gels and their thermal crystallisation is studied via in situ synchrotron X-ray powder diffraction. Mg-pyroxene crystallised to forsterite, enstatite and cristobalite. The inclusion of 10% Fe formed only forsterite at much higher temperature, while pure Mg-olivine crystallised at a lower temperature than Mg-pyroxene. Cristobalite is observed as a high-temperature crystallite in the pure-Mg compositions. Crystallisation activation energies are derived and discussed in relation to protoplanetary disks.