A new high-pressure phase of spinel

Details A new high-pressure phase of spinel A new high-pressure phase of spinel

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41..398l&link_type=abstract

Earth and Planetary Science Letters, Volume 41, Issue 4, p. 398-404.

Computer Science

11

Scientific paper

A new phase which is much denser than the component oxides of spinel (MgAl2O4) was synthesised at loading pressures greater than 250 kbar and at about 1000°C in a diamond-anvil press coupled with laser heating. The new phase (ɛ-MgAl2O4) was indexed on the basis of an orthorhombic cell with a = 8.507 +/- 0.004, b = 2.740 +/- 0.003, c = 9.407 +/- 0.005Å, and Z = 4 at room temperature and 1 bar pressure. Thus the molar volume for ɛ-MgAl2O4 at the above conditions was calculated to be 33.01 +/- 0.07 cm3, which is 10.3% less than that of the mixture corundum plus periclase. The dense phase of spinel found in shock-wave experiments can be reasonably interpreted as ɛ-MgAl2O4, and this may be a potentially important mineral component of the earth's lower mantle. The new structure may also provide a possible candidate for the dense phases of Fe3O4 and Mg2SiO4 which were found by shock experiments.

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