Characterization of quenched high pressure phases in CaSiO3 system by XRD and 29Si NMR

Masami Kanzaki, J. F. Stebbins, Xianyu Xue

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Abstract

Quenched high pressure phases in the CaSiO3 system have been studied by X-ray diffraction (XRD) and 29Si MAS NMR. XRD study of the previously reported "ε-CaSiO3 phase' synthesized at 12 GPa and 1500°C reveals that it is actually a mixture of β-Ca2SiO4 (larnite) and a previously unknown CaSi2O5 phase. This result is supported by the 29Si NMR spectra. Furthermore, both the XRD and the NMR data suggest that the CaSi2O5 phase may have a titanite (CaTiSiO5) structure in which Ti is replaced by an octahedral Si. Samples quenched from 15 GPa and 1500°C consist mostly of an amorphous phase, but a small amount of CaSiO3-perovskite was identified by both XRD and NMR. The 29Si NMR spectrum of the amorphous phase suggests that its local structure is similar to that of a glass quenched from melt at 1 bar. -Authors

Original languageEnglish
Pages (from-to)463-466
Number of pages4
JournalGeophysical Research Letters
Volume18
Issue number3
Publication statusPublished - 1991
Externally publishedYes

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nuclear magnetic resonance
X-ray diffraction
diffraction
x rays
MAS
perovskite
titanite
glass
melt

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Characterization of quenched high pressure phases in CaSiO3 system by XRD and 29Si NMR. / Kanzaki, Masami; Stebbins, J. F.; Xue, Xianyu.

In: Geophysical Research Letters, Vol. 18, No. 3, 1991, p. 463-466.

Research output: Contribution to journalArticle

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