The effect of heat treatment on explosively compacted (Y-Ba-K-Cu-O) superconductive powders

Mamalis, AG; Kotsis, I; Pantazopoulos, G; Enisz, M; Szalay, A; Manolakos, DE

dc.contributor.author	Mamalis, AG	en
dc.contributor.author	Kotsis, I	en
dc.contributor.author	Pantazopoulos, G	en
dc.contributor.author	Enisz, M	en
dc.contributor.author	Szalay, A	en
dc.contributor.author	Manolakos, DE	en
dc.date.accessioned	2014-03-01T01:13:27Z
dc.date.available	2014-03-01T01:13:27Z
dc.date.issued	1997	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12479
dc.subject	Critical Current Density	en
dc.subject	Magnetic Susceptibility	en
dc.subject	Microstructures	en
dc.subject	Physical Properties	en
dc.subject	X Ray Diffraction	en
dc.subject	Heat Treatment	en
dc.subject	Shielding Effectiveness	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Annealing	en
dc.subject.other	Ceramic materials	en
dc.subject.other	Compaction	en
dc.subject.other	Critical current density (superconductivity)	en
dc.subject.other	High temperature superconductors	en
dc.subject.other	Magnetic permeability measurement	en
dc.subject.other	Magnetic shielding	en
dc.subject.other	Powders	en
dc.subject.other	Stoichiometry	en
dc.subject.other	Superconductivity	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Yttrium compounds	en
dc.subject.other	Explosive compaction technique	en
dc.subject.other	Meissner shielding effects	en
dc.subject.other	Yttrium barium potassium copper oxide	en
dc.subject.other	Oxide superconductors	en
dc.title	The effect of heat treatment on explosively compacted (Y-Ba-K-Cu-O) superconductive powders	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0921-4534(97)01444-5	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0921-4534(97)01444-5	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	A ceramic powder mixture corresponding to the stoichiometric ratio of YBa1.95K0.05Cu3Oy superconducting ceramic with 10% w/w Ag was heat treated at 950 degrees C for 3 h in flowing oxygen. The resultant superconducting powder was consolidated in a silver tube by the explosive compaction technique (pre-heat treated ceramic). The same fabrication technique, i.e. explosive compaction, was employed to the initial stoichiometric powder mixture, without prior heat treatment and the green product was subsequently subjected to a series of heat-treating cycles (920 degrees C, 70 h), in order to obtain the required superconducting properties (post-heat treated ceramic). The microstructure and physical properties of the pre-and post-heat treated ceramics were analyzed and compared using various characterization techniques. X-ray diffraction performed on the pre-heat and post-heat treated ceramics indicated that maximum 123-phase content retained in the former case (pre-heat treated ceramic), whilst DC magnetic susceptibility measurements have shown the characteristic Meissner shielding effect at 99 and 92 K, respectively. Furthermore, the pre-heat treated compacted billet was characterized by a critical current density, J(c) equal to 2800 A/cm(2) at 77 K after suitable annealing at 850 degrees C for 10 h in oxygen stream. (C) 1997 Elsevier Science B.V.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.doi	10.1016/S0921-4534(97)01444-5	en
dc.identifier.isi	ISI:A1997XX21600007	en
dc.identifier.volume	280	en
dc.identifier.issue	4	en
dc.identifier.spage	289	en
dc.identifier.epage	296	en