ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Covalency of Сu—О Bonds in R123, R124, and Y247 (R = Rare Earth)

Z. J. Wu, S. Y. Zhang, and H. J. Zhang

Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

E-mail: zjwu@chem.wayne.edu

Abstract: The covalency of Cu-O bonds in La_0.5R_0.5Ba₂Cu₃O₇ (R = Pr, Nd, Sm, Eu, Gd, Dy, Y, He, Er, Tm, Yb, Lu), Pr_0.5R_0.5Ba₂Cu₃O₇ (R = La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, Tm, Yb, Lu), RBa₂Cu₃O₇ (R = Pr, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm), and Y₂Ba₄Cu₇O_14.3 Was calculated using the complex crystal chemical bond theory. The result indicated that the bond covalency in CuO(2) plane was smaller than that in CuO chain in 123 and 124 systems. Based on our previous study, our result indicated that La_0.5R_0.5Ba₂Cu₃O₇ and Pr_0.5R_0.5Ba₂Cu₃O7 are all superconductors. However, the nonsuperconducting behaviour of some of the title compounds indicated that further study is needed.

Full paper in Portable Document Format: 554a217.pdf

Chemical Papers 55 (4) 217–220 (2001)