High-pressure stability of the tetragonal spinel MgMn{sub 2}O{sub 4}: Role of inversion
- Dipartimento di Chimica Fisica 'M. Rolla' and INSTM, V.le Taramelli 16, I-27100, Pavia (Italy)
- European Synchrotron Radiation Facility (ESRF) 6, rue Jules Horowitz, BP 220, 38043 Genoble (France)
The phase stability of the MgMn{sub 2}O{sub 4} spinel has been studied by means of high-pressure x-ray diffraction for pressures up to 30 GPa. Two samples with different inversion degrees have been considered. Both spinels undergo a phase transition toward an orthorhombic structure (CaMn{sub 2}O{sub 4} type). As for the more inverted sample the transition pressure is at least 1 GPa lower than that of the less inverted spinel, and the volume contraction, relative compressibility, and density trends are different for the two samples, as well. These variations have been explained considering the differences in the cation distribution and electronic proprieties. Besides, a general scheme for the behavior of tetragonal spinel manganites at high pressure is suggested.
- OSTI ID:
- 20718988
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 17 Vol. 71; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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