Post‐oxide phases of forsterite and enstatite

Lin‐gun Liu

doi:10.1029/gl002i010p00417

Post‐oxide phases of forsterite and enstatite

DOI Web Site Web Site 被引用文献5件

Lin‐gun Liu

書誌事項

公開日: 1975-10

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/gl002i010p00417

公開者: American Geophysical Union (AGU)

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説明

<jats:p>Both forsterite (Mg<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub>) and enstatite (MgSiO<jats:sub>3</jats:sub>) 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 MgSiO<jats:sub>3</jats:sub> are a<jats:sub>o</jats:sub> = 4.790 ± 0.002, b<jats:sub>o</jats:sub> = 4.943 ± 0.002, and c<jats:sub>o</jats:sub> = 6.897 ± 0.003 Å with Z = 4. The calculated density of MgSiO<jats:sub>3</jats:sub> (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 MgSiO<jats:sub>3</jats:sub> (perovskite) plus MgO (periclase) is 1.9% greater than that of the mixed oxides with the forsterite stoichiometry.</jats:p>