PB2SR2CU2TAO8CL, A NEW LAYERED CUPRATE WITH HEMATOPHANITE STRUCTURE

摘要

A new layered cuprate Pb2Sr2Cu2TaO8Cl has been successfully synthesized and identified by X-ray diffraction analysis. The compound crystallizes in the hematophanite structure with the space group P4/mmm. The lattice parameters of a = 3.8921(1) Angstrom and c = 15.3835(4) Angstrom were obtained by fitting the observed XRD pattern using the Rietveld refinement method. The structure of Pb2Sr2Cu2TaO8Cl is built up by [Pb2Cl] layer, CuO5 pyramidal layers, and SrTaO3 perovskite layer alternatively along the c direction. Although complete CuO5 pyramidal planes exist in the present compounds, the as-prepared samples are insulating. (C) 1997 Academic Press. [References: 11]