Formation of thallium based high temperature superconductors using aerosol flow reacted precursor powders
Conference
·
OSTI ID:10111077
Highly anisotropic particles of various thallium containing superconductors were grown. The Tl free precursor powders with the nominal compositions Ba{sub 1}Ca{sub 2}Cu{sub 3}Ag{sub 0.37}O{sub 6} and Ba{sub 2}Ca{sub 2}Cu{sub 3}Ag{sub 0.37}O{sub 7} were prepared using an aerosol flow reactor. These precursor powders were post-annealed in 0.1 atm oxygen at 700{degree}C for 4h to reduce the carbon present, and subsequently mixed with Tl{sub 2}O{sub 3} (typical composition of Tl{sub x}; x = 0.6 {minus} 1.0). The Tl-containing powders were heat-treated in semi-sealed gold tubes between 650--890{degree}C with various short and long heat-treatments. X-ray diffraction showed that the Tl{sub 1}Ba{sub 2}Ca{sub 1}Cu{sub 2}O{sub 7} (referred to as Tl-1212) and Tl{sub 1}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9} (Tl-1223) phases formed below 700{degree}C while Tl{sub 2}Ba{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8} (Tl-2212) formed between 700--830{degree}C, and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} (Tl-2223) formed above 830{degree}C. Scanning electron microscopy showed evidence for the presence of high aspect-ratio particles. These highly anisotropic particles may be of interest for the preparation of powder-in-tube and other powder-deposited conductors, for current leads, and for grain alignment studies.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10111077
- Report Number(s):
- CONF-950265--1; ON: DE95005901
- Country of Publication:
- United States
- Language:
- English
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