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Title: Neutron and X-ray powder diffraction studies of LiMn{sub 2{minus}y}Cr{sub y}O{sub 4}

Abstract

The crystal structures of chromium-doped spinel-type lithium manganese oxides, LiMn{sub 2{minus}y}Cr{sub y}O{sub 4} (y = 0, 1/9, 1/6, and 1/3), have been studied by neutron and X-ray powder diffraction. Rietveld refinements of their neutron diffraction data revealed that Cr is substituted for Mn selectively and that Li occupies only the 8a site. Thus, the above solid solutions can be expressed as Li(Mn{sub 2{minus}y}Cr{sub y})O{sub 4}. The fractional coordinates of oxygen were almost the same in all the samples while the lattice parameter a decreased linearly with increasing Cr content. The lengths of (Mn, Cr)-O bonds in (Mn, Cr)O{sub 6} octahedra changed in a manner expected from average ionic radii for Mn{sub 2{minus}y}Cr{sub y}. Rietveld analyses of the X-ray diffraction data showed the crystallite size and anisotropic strain to decrease with increasing Cr content.

Authors:
;  [1];  [2]; ; ;  [3]
  1. Univ. of Tsukuba, Ibaraki (Japan). Inst. of Materials Science
  2. National Inst. for Research in Inorganic Materials, Tsukuba, Ibaraki (Japan)
  3. Tokyo Inst. of Tech., Ookayama, Meguro (Japan). Dept. of Chemical Engineering
Publication Date:
OSTI Identifier:
696667
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 146; Journal Issue: 2; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; LITHIUM OXIDES; MANGANESE OXIDES; CHROMIUM OXIDES; NEUTRON DIFFRACTION; X-RAY DIFFRACTION; LATTICE PARAMETERS; SOLID SOLUTIONS; STOICHIOMETRY; EXPERIMENTAL DATA

Citation Formats

Oikawa, K., Kamiyama, T., Izumi, F., Nakazato, D., Ikuta, H., and Wakihara, M. Neutron and X-ray powder diffraction studies of LiMn{sub 2{minus}y}Cr{sub y}O{sub 4}. United States: N. p., 1999. Web. doi:10.1006/jssc.1999.8351.
Oikawa, K., Kamiyama, T., Izumi, F., Nakazato, D., Ikuta, H., & Wakihara, M. Neutron and X-ray powder diffraction studies of LiMn{sub 2{minus}y}Cr{sub y}O{sub 4}. United States. doi:10.1006/jssc.1999.8351.
Oikawa, K., Kamiyama, T., Izumi, F., Nakazato, D., Ikuta, H., and Wakihara, M. Wed . "Neutron and X-ray powder diffraction studies of LiMn{sub 2{minus}y}Cr{sub y}O{sub 4}". United States. doi:10.1006/jssc.1999.8351.
@article{osti_696667,
title = {Neutron and X-ray powder diffraction studies of LiMn{sub 2{minus}y}Cr{sub y}O{sub 4}},
author = {Oikawa, K. and Kamiyama, T. and Izumi, F. and Nakazato, D. and Ikuta, H. and Wakihara, M.},
abstractNote = {The crystal structures of chromium-doped spinel-type lithium manganese oxides, LiMn{sub 2{minus}y}Cr{sub y}O{sub 4} (y = 0, 1/9, 1/6, and 1/3), have been studied by neutron and X-ray powder diffraction. Rietveld refinements of their neutron diffraction data revealed that Cr is substituted for Mn selectively and that Li occupies only the 8a site. Thus, the above solid solutions can be expressed as Li(Mn{sub 2{minus}y}Cr{sub y})O{sub 4}. The fractional coordinates of oxygen were almost the same in all the samples while the lattice parameter a decreased linearly with increasing Cr content. The lengths of (Mn, Cr)-O bonds in (Mn, Cr)O{sub 6} octahedra changed in a manner expected from average ionic radii for Mn{sub 2{minus}y}Cr{sub y}. Rietveld analyses of the X-ray diffraction data showed the crystallite size and anisotropic strain to decrease with increasing Cr content.},
doi = {10.1006/jssc.1999.8351},
journal = {Journal of Solid State Chemistry},
number = 2,
volume = 146,
place = {United States},
year = {1999},
month = {9}
}