Pressure-induced amorphization of wollastonite (CaSiO3) at room temperature

George C. Serghiou; William S. Hammack

doi:10.1063/1.464361

Pressure-induced amorphization of wollastonite (CaSiO₃) at room temperature

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Abstract

Energy dispersive x-ray diffraction and Raman measurements show that the mineral wollastonite (CaSiO₃) becomes amorphous at a pressure of 25.6 GPa at 300 K. A consideration of the high pressure/high temperature behavior of CaSiO₃ shows that the amorphization occurs because the phase transition wollastonite→perovskite CaSiO₃ is kinetically impeded. We suggest that the amorphous phase may be viewed as a defective long-period modulated wollastonite phase.

Original language	English (US)
Pages (from-to)	9830-9834
Number of pages	5
Journal	The Journal of Chemical Physics
Volume	98
Issue number	12
DOIs	https://doi.org/10.1063/1.464361
State	Published - 1993
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.464361

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Cite this

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abstract = "Energy dispersive x-ray diffraction and Raman measurements show that the mineral wollastonite (CaSiO3) becomes amorphous at a pressure of 25.6 GPa at 300 K. A consideration of the high pressure/high temperature behavior of CaSiO3 shows that the amorphization occurs because the phase transition wollastonite→perovskite CaSiO3 is kinetically impeded. We suggest that the amorphous phase may be viewed as a defective long-period modulated wollastonite phase.",

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