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Crystallographic data of new superlattice phases for spinel LiMn2O4 at low temperatures

Published online by Cambridge University Press:  10 January 2013

Hiroshi Hayakawa ,
Toshimi Takada ,
Hirotoshi Enoki  and
Etsuo Akiba
Hiroshi Hayakawa
Affiliation:
Department of Inorganic Materials, National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan
Toshimi Takada*
Affiliation:
Department of Inorganic Materials, National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan
Hirotoshi Enoki
Affiliation:
Department of Inorganic Materials, National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan
Etsuo Akiba
Affiliation:
Department of Inorganic Materials, National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan
*
a)To whom correspondence should be addressed: Tel: 298-54-4538, Fax: 298-54-4540, Electronic mail: takada@nimc.go.jp
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Abstract

Extensive analyses of low-temperature powder x-ray diffraction data for spinel LiMn2O4 (Fd3¯m at room temperature) make it clear that two structural phase transitions occur: first around 285 K from cubic to orthorhombic, second around 65 K from orthorhombic to tetragonal. At temperatures under 285 K, superlattice peaks appear in the diffraction pattern that were successfully indexed by tripling the a and b axes of the spinel unit cell. At 250 K, the unit cell is face-centered orthorhombic, Fddd, F2dd, or Fd2d, with a=24.855(1), b=24.755(2), c=8.2014(3) Å, V=5046.1(4) Å3, Dx=4.284 g/cm3, Z=72. The unit cell at 30 K was confirmed to be body-centered tetragonal I41/amd or I41/a, with a=17.5176(3), c=8.1961(2) Å, V=2515.1(1) Å3, Dx=4.298 g/cm3, Z=36.

Keywords

spinellithium manganese oxidesphase transitionx-ray diffractionindexingLiMn2O4
Type
Technical Articles
Information
Powder Diffraction , Volume 15 , Issue 1 , March 2000 , pp. 19 - 22
Copyright
Copyright © Cambridge University Press 2000

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