Synthesis and structure of new layered oxides, M{sup II}La{sub 2}Ti{sub 3}O{sub 10} (M = Co, Cu, and Zn)
- Kyung Hee Univ., Kyung Ki (Korea, Republic of)
New layered perovskite compounds, M{sup II}[La{sub 2}Ti{sub 3}O{sub 10}] (M = Co, Cu, and Zn) were synthesized by the ion-exchange reaction of the parent Na{sub 2}La{sub 2}Ti{sub 3}O{sub 10} in molten salts. The crystal structure of the as-synthesized phases was determined by the Rietveld refinement for the powder X-ray diffraction patterns. The unit cells are tetragonal with a = 3.8128(1), 3.8248(2), and 3.8127(1) {angstrom} and c = 27.568(1), 26.329(1), and 27.5129(9) {angstrom} with an I4/mmm (Z = 2) space group for the Co, Cu, and Zn phases, respectively. The transition-metal atoms occupy strongly flattened tetrahedral sites with 50% probability between the perovskite slabs. These oxides represent the first example of layered perovskite whose interlayer spaces are occupied by small transition-metal cations. Particularly for the Cu oxide, remarkable shortening of the c-axis was observed upon heating up to 700 C under an Ar atmosphere. Such a contraction is likely to result from the flattening of the CuO{sub 4} unit toward a quasi-square planar coordination.
- OSTI ID:
- 329071
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 2 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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