New Tl-Ba-Ca-Cu-O (1234 and 1245) superconductors with Tc > 117 K

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6085648

Ihara, H; Hirabayashi, M; Terada, N; Jo, M; Hayashi, K; Tokumoto, M; Murata, K; Kimura, Y; Sugise, R; Shimomura, T

The new TlBa/sub 2/Ca/sub 3/Cu/sub 4/O/sub 11/ (1234) and TlBa/sub 2/Ca/sub 4/Cu/sub 5/O/sub 13/ (1245) superconductors with new composition and new structure have been designed and synthesized for the first time. The compounds have the Tc values of 116 -- 122 K. The highest Tc value was obtained for the 1234 phase. These are single Tl-O layer compounds with less Tl content than a half of that in the previous 2223 phase. The structure of the compounds is a simple tetragonal phase with the lattice constants of a = b = 3.85 A and c = 19.1 A for the 1234 phase and a = b = 3.85 A and c = 22.3 A for the 1245 phase. The electron diffraction patterns and the lattice images from a high resolution TEM have confirmed the oxygen-deficient layered-perovskite structure with the space group of P4/mmm. The c-lattice constant follows the c-axis rule of a linear relation of c = 6.3 + 3.2 n (n = the number of Cu-O layer). The Tc value is strongly related to the valence of Cu ion.

• Research Organization: 9698989; 9699393; Unitika R and D Center, Uji, Kyoto (JP)
• OSTI ID: 6085648
• Report Number(s): CONF-880812-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER IONS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DESIGN
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
IONS
LATTICE PARAMETERS
MATERIALS
MATRIX MATERIALS
MICROSCOPY
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROVSKITES
PHASE STUDIES
POINT DEFECTS
SCATTERING
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TETRAGONAL LATTICES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES