Preparative and structural studies on the superconducting phase Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8/
Previously others have reported the existence in the system Tl-Ca-Ba-Cu-O of two high T/sub c/ (above 100K) superconducting phases, namely Tl/sub 2/Ca/sub 2/Ba/sub 2/Cu/sub 3/O/sub 10+d/ (2223) and Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8+d/ (2122). They did not get samples pure enough for detailed analysis of crystal structure. The authors have just finished determining the crystal structure of the superconducting phase Bi/sub 4/Ca/sub 2/Sr/sub 4/Cu/sub 4/O/sub 20-x/. This bismuth-containing phase displays onset temperatures and T/sub c/ at 113 and 80K respectively. However, the thallium-containing phase of a similar metal-ion stoichiometry, namely, 2122 has a higher T/sub c/. They have prepared a homogeneous sample for the phase and determined its crystal structure by powder XRD method. Then the structural features of the present phase is compared with that of the bismuth-containing phase 4244. No occupancy problem for oxygen and cupric state of copper have been found.
- Research Organization:
- Institute of Physical Chemistry, Peking Univ. (CN)
- OSTI ID:
- 5828371
- Journal Information:
- Mod. Phys. Letters B; (United States), Journal Name: Mod. Phys. Letters B; (United States) Vol. 2:6; ISSN MPLBE
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
HIGH TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POWDERS
SCATTERING
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION