Structural phase transition of the spinel-type oxide LiMn2O4

Kenichi Oikawa; Takashi Kamiyama; Fujio Izumi; Bryan C. Chakoumakos; Hiromasa Ikuta; Masataka Wakihara; Jianqi Li; Yoshio Matsui

doi:10.1016/s0167-2738(98)00073-3

Structural phase transition of the spinel-type oxide LiMn₂O₄

Kenichi Oikawa, Takashi Kamiyama, Fujio Izumi, Bryan C. Chakoumakos, Hiromasa Ikuta, Masataka Wakihara, Jianqi Li, Yoshio Matsui

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

The crystal structure of the low-temperature (LT) form of spinel-type LiMn₂O₄ has been studied by neutron and X-ray powder diffraction as well as electron diffraction. Reflections of the LT phase in its neutron and X-ray diffraction patterns were indexed on the basis of not a tetragonal unit cell but roughly an orthorhombic one (space group Fddd) with lattice parameters a = 8.2797(2), b = 8.2444(3) and c = 8.1981(2) Å. However, the presence of extra reflections which cannot be indexed with this unit cell shows that the actual lattice parameters are different from the above ones. Superlattice reflections, which were missing in powder diffraction patterns, with tripled periodicity were observed in electron diffraction patterns of the LT phase.

Original language	English
Pages (from-to)	35-41
Number of pages	7
Journal	Solid State Ionics
Volume	109
Issue number	1-2
DOIs	https://doi.org/10.1016/s0167-2738(98)00073-3
State	Published - Jun 1 1998

Funding

The authors would like to thank T. Yamanoi of MAC Science for the low-temperature X-ray diffraction measurements. The work at Oak Ridge National Laboratory was supported by the U.S. Department of Energy, under Agreement No. UA-96-122 between the University of Tsukuba with Lockheed Martin Energy Research Corporation. Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corporation for the U.S. Department of Energy under contract number DE-AC05-96OR22464.

Funders	Funder number
U.S. Department of Energy
Lockheed Martin Corporation	DE-AC05-96OR22464

Keywords

Lithium manganese oxide
Neutron powder diffraction
Structural phase transition

Access to Document

10.1016/s0167-2738(98)00073-3

Cite this

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title = "Structural phase transition of the spinel-type oxide LiMn2O4",

abstract = "The crystal structure of the low-temperature (LT) form of spinel-type LiMn2O4 has been studied by neutron and X-ray powder diffraction as well as electron diffraction. Reflections of the LT phase in its neutron and X-ray diffraction patterns were indexed on the basis of not a tetragonal unit cell but roughly an orthorhombic one (space group Fddd) with lattice parameters a = 8.2797(2), b = 8.2444(3) and c = 8.1981(2) {\AA}. However, the presence of extra reflections which cannot be indexed with this unit cell shows that the actual lattice parameters are different from the above ones. Superlattice reflections, which were missing in powder diffraction patterns, with tripled periodicity were observed in electron diffraction patterns of the LT phase.",

keywords = "Lithium manganese oxide, Neutron powder diffraction, Structural phase transition",

author = "Kenichi Oikawa and Takashi Kamiyama and Fujio Izumi and Chakoumakos, {Bryan C.} and Hiromasa Ikuta and Masataka Wakihara and Jianqi Li and Yoshio Matsui",

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T1 - Structural phase transition of the spinel-type oxide LiMn2O4

AU - Oikawa, Kenichi

AU - Kamiyama, Takashi

AU - Izumi, Fujio

AU - Chakoumakos, Bryan C.

AU - Ikuta, Hiromasa

AU - Wakihara, Masataka

AU - Li, Jianqi

AU - Matsui, Yoshio

PY - 1998/6/1

Y1 - 1998/6/1

N2 - The crystal structure of the low-temperature (LT) form of spinel-type LiMn2O4 has been studied by neutron and X-ray powder diffraction as well as electron diffraction. Reflections of the LT phase in its neutron and X-ray diffraction patterns were indexed on the basis of not a tetragonal unit cell but roughly an orthorhombic one (space group Fddd) with lattice parameters a = 8.2797(2), b = 8.2444(3) and c = 8.1981(2) Å. However, the presence of extra reflections which cannot be indexed with this unit cell shows that the actual lattice parameters are different from the above ones. Superlattice reflections, which were missing in powder diffraction patterns, with tripled periodicity were observed in electron diffraction patterns of the LT phase.

AB - The crystal structure of the low-temperature (LT) form of spinel-type LiMn2O4 has been studied by neutron and X-ray powder diffraction as well as electron diffraction. Reflections of the LT phase in its neutron and X-ray diffraction patterns were indexed on the basis of not a tetragonal unit cell but roughly an orthorhombic one (space group Fddd) with lattice parameters a = 8.2797(2), b = 8.2444(3) and c = 8.1981(2) Å. However, the presence of extra reflections which cannot be indexed with this unit cell shows that the actual lattice parameters are different from the above ones. Superlattice reflections, which were missing in powder diffraction patterns, with tripled periodicity were observed in electron diffraction patterns of the LT phase.

KW - Lithium manganese oxide

KW - Neutron powder diffraction

KW - Structural phase transition

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