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Spectroscopy and transitions

Detecting the spinel–post-spinel transition in Fe3O4 by in situ electrical resistivity measurements

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Pages 520-524 | Received 03 Sep 2009, Published online: 15 Dec 2009
 

Abstract

The phase transformation of magnetite to h-Fe3O4 was investigated at high pressure and temperature by in situ resistivity measurements in a multi-anvil press. Experiments at pressures≤9 GPa show similar resistivity paths during heating and cooling, indicating the stability of magnetite. During heating at 10 and 12 GPa, a distinctive jump in resistivity occurred that is attributed to the formation of h-Fe3O4. Microstructural investigations by TEM confirm this conclusion. Our results imply that the magnetite–h-Fe3O4 phase boundary is nearly isobaric and must lie between 9 and 10 GPa.

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