High Pressure X-ray Diffraction Study of MgMn2O4 Tetragonal Spinel

Details High Pressure X-ray Diffraction Study of MgMn2O4 Tetragonal Spinel High Pressure X-ray Diffraction Study of MgMn2O4 Tetragonal Spinel

2004-08-26

arxiv.org/abs/cond-mat/0408559v1

Physics

Condensed Matter

Materials Science

12 pages; 4 Figures presented at the SRMS-4

Scientific paper

10.1016/j.nimb.2005.06.042

The phase stability of the MgMn2O4 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 towards an orthorhombic structure (CaMn2O4-type). For the more inverted sample the transition pressure is at least 1 GPa lower with respect to that of the less inverted spinel. Also the volume contraction, relative compressibility and density trends are different for the two samples. These variations have been explained according to differences in the cation distribution. and electronic properties of the samples.

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