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Preparation and Chemical Composition of Superconducting Oxide Tl 2 Ba 2 Ca n-1 Cu n O 2n+4 with n=1, 2 and 3

1989; Institute of Physics; Volume: 28; Issue: 3A Linguagem: Inglês

10.1143/jjap.28.l382

1347-4065

Masae Kikuchi, Tsuyoshi Kajitani, Teruo Suzuki, Satoru Nakajima, Kenji Hiraga, Norio Kobayashi, Hideo Iwasaki, Yasuhiko Syono, Yoshio Mutô,

Inorganic Fluorides and Related Compounds

Superconducting oxides of Tl 2 Ba 2 Ca n -1 Cu n O 2 n +4 with n =1, 2 and 3 were synthesized, and their structure and chemical composition were examined by X-ray powder diffraction, EPMA, Rietveld analysis and electron microscopy. Partial substitution of Tl with Ca was confirmed, but the production of holes in Cu layers expected from this substitution was rather small for a 120 K superconductor. Charge transfer of Tl 3-δ -Cu 2+δ would provide both the hole in the Cu-O bond required for high T c and s-like electron of Tl atoms for stabilization of layered structures.