Nd2BaCuO5-Type Structure: Nickel in Square Planar Coordination and Copper Mixed Valency

✍ Scribed by L. Barbey; N. Nguyen; B. Raveau

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 203 KB
• Volume: 102
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1018

✦ Synopsis

The new mixed-valence phases of copper and nickel (\mathrm{Nd}{2-x} A{x} \mathrm{BaCu}{1-y} \mathrm{Ni}{y} \mathrm{O}{5}(A=\mathrm{Ba}, \mathrm{Sr}, \mathrm{Ca})) with the (\mathrm{Nd}{2} \mathrm{BaCuO}_{5}-\mathrm{type}) structure were isolated. Structure calculations evidence a square planar coordination of nickel. The decrease of the cell volume as the substitution rate (\mathrm{Ni} / \mathrm{Cu}) increases is in agreement with the increase of the mean oxidation state of the transition elements in this square coordination. Influence of the Nd(III) ion in magnetic susceptibility is shown in this study. O 1993 Academic Press, Inc.