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AGU: Geophysical Research Letters

 

Index Terms

  • Mineralogy, Petrology, and Crystal Chemistry: Experimental mineralogy and petrology
  • Mineralogy, Petrology, and Crystal Chemistry: Properties of minerals
  • Physical Properties of Rocks: Phase changes

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 2, NO. 10, PP. 417-419, 1975
doi:10.1029/GL002i010p00417

Post‐oxide phases of forsterite and enstatite

Lin‐gun Liu

Research School of Earth Sciences, Australian National University, Canberra, Australia

Both forsterite (Mg2SiO4) and enstatite (MgSiO3) enter a post‐oxide phase characterized by the orthorhombic perovskite structure when subjected to high pressure and temperature in the diamond‐anvil press coupled with laser heating. The lattice parameters for the perovskite phase of MgSiO3 are ao = 4.790 ± 0.002, bo = 4.943 ± 0.002, and co = 6.897 ± 0.003 Å with Z = 4. The calculated density of MgSiO3 (perovskite) is thus 4.083 g/cm³, or 2.8% denser than its isochemical mixed oxides with rocksalt and rutile structures. The density of a mixture of MgSiO3 (perovskite) plus MgO (periclase) is 1.9% greater than that of the mixed oxides with the forsterite stoichiometry.

Received 27 August 1975; accepted 19 September 1975; .

Citation: Liu, L. (1975), Post‐oxide phases of forsterite and enstatite, Geophys. Res. Lett., 2(10), 417–419, doi:10.1029/GL002i010p00417.

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