SUPERCONDUCTIVITY IN YBA2CU3O7-DELTA-YBA2HFO5.5 COMPOSITES BY RAPID QUENCHING IN AIR

Authors
KOSHY J THOMAS JK KURIAN J YADAVA YP ITTYACHAN MA DAMODARAN AD
Citation
J. Koshy et al., SUPERCONDUCTIVITY IN YBA2CU3O7-DELTA-YBA2HFO5.5 COMPOSITES BY RAPID QUENCHING IN AIR, Physica. C, Superconductivity, 219(1-2), 1994, pp. 141-144
Citations number
9
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
219
Issue
1-2
Year of publication
1994
Pages
141 - 144
Database
ISI
SICI code
0921-4534(1994)219:1-2<141:SIYCBR>2.0.ZU;2-Z
Abstract
The chemical reactivity and high-temperature superconductivity in the YBa2Cu3O7-delta-YBa2HfO5.5 composite system have been studied by XRD a nd resistivity measurements. No detectable chemical reaction between Y Ba2Cu3O7-delta and the non-metal ceramic YBa2HfO5.5 was observed even under severe heat treatment. It was found that the common procedure of slow cooling at a rate of 2-degrees-C/min or annealing for several ho urs at temperatures between 700-500-degrees-C after high-temperature s intering is not essential to obtain superconductivity in YBa2Cu3O7-del ta-YBa2HfO5.5 COMPoSites. A superconducting transition of 92 K was obt ained in this system, for a wide composition range by directly quenchi ng these samples in air from a sintering temperature of 950-degrees-C.