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Raman spectra of bixbyite, Mn2O3, up to 40 GPa

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Abstract

The Raman spectra of bixbyite, Mn2O3, were measured up to 40 GPa at room temperature. Mn2O3 undergoes a phase transition from the C-type rare earth structure to the CaIrO3-type (post-perovskite) structure at 16–25 GPa. The transition pressure measured in Raman spectroscopy is significantly lower than the pressure reported previously by an X-ray diffraction study. This could be due to the greater polarizability in the CaIrO3-type structure, consistent with high-pressure observation on the CaIrO3 type in MgGeO3, although it is still possible that experimental differences may cause the discrepancy. Unlike the change at the perovskite to CaIrO3-type transition, the spectroscopic Grüneisen parameter does not decrease at the C-type to CaIrO3-type transition. The spectroscopic Grüneisen parameter of the low-pressure phase (C type) is significantly lower than thermodynamic Grüneisen parameter, suggesting significant magnetic contributions to the thermodynamic property of this material. Our Raman measurements on CaIrO3-type Mn2O3 contribute to building systematic knowledge about this structure, which has emerged as one of the common structures found in geophysically important materials.

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Acknowledgments

We thank two anonymous reviewers for their helpful comments. Construction of the laser Raman system at MIT was supported by NSF (EAR0337156). Raman measurements were supported by NSF for SHS and DL (EAR0337005).

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Authors and Affiliations

  1. Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA

    S.-H. Shim & D. LaBounty

  2. Princeton University, Guyot Hall, Princeton, NJ, 08544, USA

    T. S. Duffy

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  1. S.-H. Shim
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  2. D. LaBounty
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  3. T. S. Duffy
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Correspondence to S.-H. Shim.

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Shim, SH., LaBounty, D. & Duffy, T.S. Raman spectra of bixbyite, Mn2O3, up to 40 GPa. Phys Chem Minerals 38, 685–691 (2011). https://doi.org/10.1007/s00269-011-0441-4

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  • DOI: https://doi.org/10.1007/s00269-011-0441-4

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