Characteristics of Hg-based superconductors prepared at 0.2 GPa by HIP
Journal Article
·
· International Journal of Modern Physics B
- IRTEC-CNR, Faenza (Italy)
- Univ. of Ancona (Italy)
The preparation of Hg(Pb)BCCO (1201) and (1223) phases was performed by hot-isostatic-pressing (HIP) using simple oxides as precursors canned in silver tube. In the case of Hg{sub 0.8}Pb{sub 0.2}Ba{sub 2}CuO{sub 4+{delta}} the preparation, carried out at 800 C and 0.2 GPa for 5 hrs, yielded a single phase bulk sample. On the other hand the preparation of Hg{sub 0.8}Pb{sub 0.2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} at 820 C and 0.2 GPa for 5 hrs allowed the attainment of a high volume fraction of 1223 phase. Magnetic susceptibility of 1201 phase showed a granular transition around 90 K; in the case of 1223 the value was {approx}128 K followed by a broadened intergranular transition. These results show the feasibility of 1201 phase synthesis with high purity and of 1223 phase in large amount (>80%). The possibility to obtain the samples directly in form of dense bulks (with density {ge} 85%) stresses the importance of this technique in relation to the intrinsic low thermal stability of the superconducting phases.
- OSTI ID:
- 687407
- Report Number(s):
- CONF-9810174--
- Journal Information:
- International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 9-10 Vol. 13; ISSN IJPBEV; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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