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Crystallisation of amorphous Mg-Fe silicates produced from microwave-dried sol-gels

Published online by Cambridge University Press:  12 October 2020

Stephen P. Thompson Open the ORCID record for Stephen P. Thompson [Opens in a new window] ,
Anna Herlihy ,
Claire A. Murray ,
Annabelle R. Baker  and
Sarah J. Day
Stephen P. Thompson
Affiliation:
Diamond Light Source, Harwell Science & Innovation campus, Didcot, Oxforshire OX11 0DE, UK email: stephen.thompson@diamond.ac.uk
Anna Herlihy
Affiliation:
Diamond Light Source, Harwell Science & Innovation campus, Didcot, Oxforshire OX11 0DE, UK email: stephen.thompson@diamond.ac.uk
Claire A. Murray
Affiliation:
Diamond Light Source, Harwell Science & Innovation campus, Didcot, Oxforshire OX11 0DE, UK email: stephen.thompson@diamond.ac.uk
Annabelle R. Baker
Affiliation:
Diamond Light Source, Harwell Science & Innovation campus, Didcot, Oxforshire OX11 0DE, UK email: stephen.thompson@diamond.ac.uk
Sarah J. Day
Affiliation:
Diamond Light Source, Harwell Science & Innovation campus, Didcot, Oxforshire OX11 0DE, UK email: stephen.thompson@diamond.ac.uk
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Abstract

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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.

Keywords

methods: laboratoryplanetary systems: protoplanetary disksISM: dustcomets: generalinfrared: generalX-rays: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 408 - 409
Copyright
© International Astronomical Union 2020

References

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Thompson, S. P., Demyk, K., Day, S. J., Evans, A., Leroux, H., Depecker, C., Parker, J. E., Connor, L., Wilhelm, W., & Cibin, G. 2016, J. Non-Cryst. Solids, 447, 255Google Scholar
Thompson, S. P., Herlihy, A., Murray, C. A. M., Baker, A. R., Day, S. J., Smith, A. J., & Snow, T. 2019, A&A, 624, A136Google Scholar