An unquenchable perovskite phase of MgGeO3 and comparison with MgSiO3 perovskite

Kurt Leinenweber, Wang Yanbin Wang, T. Yagi, H. Yusa

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

An unquenchable polymorph of MgGeO3, having a perovskite structure, has been observed using in situ X-ray diffraction in a diamond-anvil cell. The perovskite polymorph formed at room temperature and 12-14 GPa by pressure-induced phase transition from the lithium niobate phase of MgGeO3. It is indexed on an orthorhombic lattice, with unit-cell parameters a = 4.832(11), b = 5.03(13), c = 7.022(16) Å, and V = 170.7(5) Å3 at 17.9 GPa. The transition is fully reversed during decompression. Like MgSiO3 perovskite, MgGeO3 perovskite only becomes thermodynamically stable at very high pressures (over 23 GPa). Unlike MgSiO3, it also becomes unstable relative to the lithium niobate phase during pressure release. The latter property accounts for the lack of observation of the perovskite phase in previous studies of MgGeO3 as an analogue material. -Authors

Original languageEnglish (US)
Pages (from-to)197-199
Number of pages3
JournalAmerican Mineralogist
Volume79
Issue number1-2
StatePublished - Jan 1 1994
Externally publishedYes

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perovskite
lithium niobates
pressure reduction
anvils
cells
lithium
Polymorphism
diamonds
analogs
room temperature
diamond anvil cell
diffraction
Diamond
decompression
phase transition
x rays
Phase transitions
X-ray diffraction
comparison
X ray diffraction

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

An unquenchable perovskite phase of MgGeO3 and comparison with MgSiO3 perovskite. / Leinenweber, Kurt; Yanbin Wang, Wang; Yagi, T.; Yusa, H.

In: American Mineralogist, Vol. 79, No. 1-2, 01.01.1994, p. 197-199.

Research output: Contribution to journalArticle

Leinenweber, K, Yanbin Wang, W, Yagi, T & Yusa, H 1994, 'An unquenchable perovskite phase of MgGeO3 and comparison with MgSiO3 perovskite', American Mineralogist, vol. 79, no. 1-2, pp. 197-199.
Leinenweber, Kurt ; Yanbin Wang, Wang ; Yagi, T. ; Yusa, H. / An unquenchable perovskite phase of MgGeO3 and comparison with MgSiO3 perovskite. In: American Mineralogist. 1994 ; Vol. 79, No. 1-2. pp. 197-199.
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