New double chloride in the LiCl-CoCl/sub 2/ system. II. Preparation, crystal structure, phase transformation, and ionic conductivity of Li/sub 2/CoCl/sub 4/ spinel

Journal Article · Sun Nov 01 04:00:00 EST 1987 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(87)90159-9· OSTI ID:5572434

Kanno, R; Takeda, Y; Takahashi, A; Yamamoto, O; Suyama, R; Kume, S

A new double chloride Li/sub 2/CoCl/sub 4/ was prepared in the LiCl-CoCl/sub 2/ system and was characterized by X-ray Rietveld structure analysis, differential thermal analysis, high-temperature X-ray diffraction, and electrical conductivity measurements. This phase has an orthorhombic symmetry Imma, with lattice parameters a = 7.1772(2), b = 7.2478(2), and c = 10.2785(3) A, and its unit cell is related to the parent cubic spinel lattice in the manner that a/sub o/ approx. 1/2/sup 1/2/a/sub c/, b/sub o/ approx. 1/2/sup 1/2/a/sub c/, and c/sub o/ approx. a/sub c/, where the subscripts c and o stand for the cubic and orthorhombic structures, respectively. The orthorhombic distortion, caused by a 1:1 ordering of Li/sup +/ and Co/sup 2 +/ ions on the octahedral sites, transformed to the cubic spinel structure at 308/sup 0/C. The transition is the order-disorder type for cation distribution on the octahedral sites. Li/sub 2/CoCl/sub 4/ showed a high ionic conductivity of 5.0 X 10/sup -2/ S cm/sup -1/ at 400/sup 0/C. The transition from the orthorhombic to the cubic spinel structure corresponds to that from the low to high ionic conductive phase.

• Research Organization: Mie Univ., Tsu, Japan
• OSTI ID: 5572434
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 71:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

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