Crystal structure and superconductivity of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ compound
The crystal structure of the ideal compositional compound Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ with superconducting transition temperature T/sub c/ (0) = 81.4K has been determined by X-ray powder diffraction method. The basic structure of this compound has the tetragonal symmetry with the lattice constants /alpha/ = 3.825A, c = 30.82A. The most possible space group is D/sub 4h//sup 17/-14/mmm. Each unit cell contains two chemical formulate. The arrangements of atoms in the unit cell are as follows: 2Ca cations occupy 2(a) equivalent point position 4Sr, 4Bi and 4Cu cations occupy the same equivalent point position 4(e) with respective parameters z = 0.1, 0.3, 0.45. 160 anions respectively occupy 8(g)(z = 0.45) and two 4(e) equivalent point positions (z = 0.2 and z = 0.385). The crystal structure of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ can be derived from Aurivillius type structures. The other possible superconducting phase in the Bi-Sr-Ca-Cu-O system can be considered as the structure having different stacking on the basis of Aurivillius phase.
- Research Organization:
- Institute of Physics, Chinese Academy of Science, Beijing (CN)
- OSTI ID:
- 5709656
- Journal Information:
- Mod. Phys. Letters B; (United States), Journal Name: Mod. Phys. Letters B; (United States) Vol. 2:1; ISSN MPLBE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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Cermets
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656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION