High-pressure phase of the cubic spinel NiMn2O4

被引：47

作者：

Asbrink, S ^{[1
]}

Waskowska, A

Olsen, JS

Gerward, L

机构：

[1] Univ Stockholm, Arrhenius Lab, Dept Inorgan Chem, S-10691 Stockholm, Sweden

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[3] Univ Copenhagen, Niels Bohr Inst, Oersted Lab, DK-2100 Copenhagen, Denmark

[4] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.57.4972

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：4972 / 4974

页数：3

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