X-Ray Single Crystal Structure Analysis of the Three-Leg-Ladder Compound (Sr, Ca)4Cu6O10

✍ Scribed by H. Schwer; E.M. Kopnin; J. Jun; J. Karpinski

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 313 KB
• Volume: 134
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7716

✦ Synopsis

Crystals with the general formula Sr n؊1 Cu n؉1 O 2n belong to the ''ladder'' compounds, a new series of high-pressure materials. They are expected to have interesting magnetic properties and are possible candidates for HT c superconductors. For the first time single crystals of (Sr, Ca) 4 Cu 6 O 10 have been grown using a high-Ar-gas-pressure method. A crystal was measured on an X-ray four circle single crystal diffractometer and the structure was refined to R ‫؍‬ 0.056 with F data and wR ‫؍‬ 0.094 with F 2 data. (Sr, Ca) 4 Cu 6 O 10 crystallizes with space group No. 65 Cmmm (Z ‫؍‬ 1) and has lattice parameters a ‫؍‬ 3.9299(5) A > , b ‫؍‬ 19.392(3) A > , c ‫؍‬ 3.4358(5) A > . The Ca content at the Sr site was refined to 4.3(8)%. The crystal structure consists of layers with coupled chains formed by both edge-and corner-sharing CuO 4 units (''ladders'') separated by layers of Sr/Ca atoms.