The effects of carbon on TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} phase formation in the TlF{endash}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital z}} system
- Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
The effects of carbon on TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} phase formation in the TlF{endash}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital z}} system were investigated by varying the carbon contents in Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital z}} precursor powders that were mixed with TlF and reacted to form the superconducting phase. It was found that carbon induced Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}} phase formation resulting in superlattices formed by {ital c}-axis intergrowths between TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}}. The superlattices were highly regular and uniform throughout the samples. While TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} was the main phase at low carbon content (0.231 wt{percent}), Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}} became the dominant phase at high carbon content (0.472 wt{percent}) even with a 1:2:2:3 (Tl:Ba:Ca:Cu) starting composition. {copyright} {ital 1996 American Institute of Physics.}
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 397395
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 69; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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