Synthesis and structural characterization of layered cuprates containing a lead halide separating layer
- Univ. of Southampton (United Kingdom). Dept. of Chemistry
A series of layered cuprates of the general formula Pb{sub y}(Ba/Sr){sub 4{minus}y}Cu{sub 2}MO{sub 8}X, where M = Nb, Ta, and Sb; X = Br and Cl; and y = 2, 3, have been synthesized. The detailed structural characterization of these materials has been performed using Rietveld refinement of high-resolution PND data. The compounds crystallize with a tetragonal unit cell, space group P4/mmm; cell parameters in the range a = 3.8982(2)--3.9732(2) {angstrom} and c = 15.3886(8)-15.8689(11) {angstrom}. The structure of the materials consists of two CuO{sub 5} square pyramids connected by a (Ba/Sr)MO{sub 3} perovskite layer, a unit also present in the widely studied Ln-1212 phases, with an interleaving Pb{sub 2}X layer. The material Pb{sub 2}Sr{sub 2}Cu{sub 2}SbO{sub 8}Cl has the shortest Cu-O in plane bond length of 1.9570(5) {angstrom}, which lies close to the length required for the observation of superconductivity. However, preliminary investigation of the electronic properties of these materials show that they exhibit semiconducting behavior down to 4 K.
- OSTI ID:
- 328246
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 12 Vol. 10; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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