A Structural Study of the Quasi One-Dimensional Compound (Ca1−xYx)0.82CuO2 Prepared at Room Pressure

✍ Scribed by Yuzuru Miyazaki; Ian Gameson; Peter P. Edwards

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 243 KB
• Volume: 145
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8196

✦ Synopsis

A solid solution of the quasi one-dimensional cuprate, (Ca 1؊x Y x ) 0.82 CuO 2 (04x40.435), has been successfully synthesized in an oxygen stream at room pressure. Structural changes have been determined for the basic crystal structure by means of the Rietveld method using powder X-ray di4raction. Upon Y doping, the nearest (intrachain) Cu+Cu distance increases from 1.93 to 1.98 A s , while the next-nearest (interchain) Cu+Cu distance decreases from 3.46 to 3.41 A s . The incommensurate superstructure, originating from di4erences in the periodic arrangement of the (Ca, Y) atoms and CuO 2 chains, has also been examined. The modulation period along the crystal a axis implies that the stoichiometry of the solid solution shifts toward that of the cation-de5cient member (Ca 1؊x Y x ) 0.80 CuO 2 . This compositional discrepancy might be canceled by the large change in the modulation period along the c axis.