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American Mineralogist; April 2005; v. 90; no. 4; p. 764-767; DOI: 10.2138/am.2005.1714
© 2005 Mineralogical Society of America
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Letter

Cation distribution in MgFe2O4 vs. pressure and temperature: Experiments in a "piston-cylinder" apparatus

Alexander I. Turkin1 and Valeri A. Drebushchak1,2,*

1 Institute of Mineralogy and Petrography SB RAS, Prospect Ac. Koptyuga 3, Novosibirsk 630090, Russia
2 Molecular Design and Ecologically Safe Technologies, REC-008, Novosibirsk State University, Ul. Pirogova 2, Novosibirsk 630090, Russia

Correspondence: * E-mail: dva{at}uiggm.nsc.ru

The cation distribution in magnesioferrite MgFe2O4 was investigated using a "piston-cylinder" apparatus at three pressures (ambient, 1, and 2 GPa) over a temperature range of 600 to 1200 °C. Quenched samples of magnesioferrite were investigated by X-ray powder diffraction. The inversion parameter was derived from the unit-cell parameter at ambient temperature.

The inversion parameter increases with pressure, being a smooth function of P-T conditions. The changes in the cation distribution in magnesioferrite caused by the changes in P-T conditions produce the contributions to the bulk modulus (<0.01%) and thermal expansion coefficient (12–60%). On average, the pressure increment of 0.01 GPa is compensated for by 1 °C heating.

The effect of pressure on the cation ordering obeys the fundamental relationship (dV/dx)T,P (dx/dP)T < 0. The terms are (dV/dx) < 0 and (dx/dP) > 0 for MgFe2O4 and MgAl2O4.






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