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Journal of Electron Microscopy 50:457-463 (2001)
© 2001 Oxford University Press

Paper

HRTEM study of new series of oxycarbonitrate superconductors (Cu,C,N)Sr2Can–1CunOy (n = 1–6)

Yoshihiro Anan,, Toru Asaka,, Jun Hatano, Nikolai D. Zhigadlo, Eiji Takayama-Muromachi, Koji Kimoto and Yoshio Matsui,

Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044
Faculty of Industrial Science and Technology, Science University of Tokyo, Noda 278-8510
Graduate School of Science and Engineering, Waseda University, Tokyo 169-8085, Japan

Arrangements of Cu and anion groups (CO3 and NO3) in the charge-reservoir (CR) blocks of a series of new oxycarbonitrate superconductors (Cu,C,N)Sr2Can–1CunOy (n = 1–6) were examined by means of electron diffraction and high-resolution transmission electron microscopy (HRTEM). The first three members with n = 1–3 [Tc = 33 K (n = 1), 91 K (n = 2), 90 K (n = 3)] show the 4a0-type superstructures with periodic arrangements, [-Cu-X-X-X-Cu-X-X-X-Cu-] (X = CO3, NO3), in the CR blocks. The third member (n = 3) partly contains the 2a0-type of superstructure with [-Cu-X-Cu-X-Cu[] in the CR blocks. The fourth member with n = 4 (Tc = 113 K) contains only the 2a0-type of superstructure. The higher members, with n = 5 (Tc = 65 K) and n = 6 (Tc = 52 K), show no evidence of ordering in the CR blocks, suggesting random arrangements of Cu and anion groups.

Keywords     high-Tc superconductors, oxycarbonitrate, HRTEM


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