High-pressure phase of the cubic spinel NiMn2O4

S. Åsbrink, A. Waskowska, J. Staun Olsen, Leif Gerward

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It has been observed that the fee spinel NiMn2O4 transforms to a tetragonal structure at about 12 GPa. The tetragonal phase does not revert to the cubic phase upon decompression and its unit-cell constants at ambient pressure are a(0)=8.65(8) and c(0)=7.88(15) Angstrom (distorted fee). Within thr experimental uncertainty, there is no volume change at the transition. The cia ratio of the tetragonal spinel is almost independent of pressure and equal to 0.91. The phase transition is attributed to the Jahn-Teller-type distortion and the ionic configurationcan be assumed as (Mn3+)(tetr)[Ni2+Mn3+](oct). The bulk modulus of the cubic phase is 206(4) GPa.
Original languageEnglish
JournalPhysical Review B
Issue number9
Pages (from-to)4972-4974
Publication statusPublished - 1998

Bibliographical note

Copyright (1998) by the American Physical Society.


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