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Titolo:
CHARACTERIZATION OF THE TEXTURING OF YBA2CU3O7-DELTA IN THE PRESENCE OF LIQUID-PHASE ADDITIVES
Autore:
FAGAN JG; PARTIS DA; RICHMONDHOPE JA; AMARAKOON VRW;
Indirizzi:
ALFRED UNIV,NEW YORK STATE COLL CERAM ALFRED NY 14802
Titolo Testata:
Journal of electronic materials
fascicolo: 11, volume: 23, anno: 1994,
pagine: 1103 - 1109
SICI:
0361-5235(1994)23:11<1103:COTTOY>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
BA-CU-O; GRAIN-GROWTH; CRYSTAL-GROWTH; MELT; SUPERCONDUCTORS; SOLIDIFICATION; COMPOSITES; SILVER; OXIDES; Y2O3;
Keywords:
123 (YBA2CU3O7-DELTA); GRAIN GROWTH; TEXTURING; LIQUID PHASE ADDITIVES; DIFFUSION COUPLES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
J.G. Fagan et al., "CHARACTERIZATION OF THE TEXTURING OF YBA2CU3O7-DELTA IN THE PRESENCE OF LIQUID-PHASE ADDITIVES", Journal of electronic materials, 23(11), 1994, pp. 1103-1109

Abstract

Grain growth and texturing of YBa2Cu3O7-delta is greatly influenced by the presence of liquid phase additives during sintering. Oxides suchas TiO2, SiO2, Bi2O3, and Pr6O11 were incorporated into the liquid phase during the sintering of YBa2Cu3O7-delta (123) by use of grain boundary diffusion couples and the microstructure was analyzed using scanning electron microscopy/electron dispersive spectroscopy. Exaggerated grain growth and domain formation was observed in bulk specimens. Differential thermal analysis and real time dynamic x-ray diffaction were used to determine reaction sequencing. The ability and extent of domain formation was determined for 123 samples coupled with impurity oxides to be a function of sintering temperature (940-980 degrees) and oxygen partial pressure. Enhanced texturing was observed at low PO2 atmospheres. The addition of Bi2O3 and TiO2 was shown to degrade de magneticsusceptibility of 123 whereas SiO2 and Pr6O11 enhanced it. The domainformation and texturing takes place in the bulk for 123 at temperatures of 980 degrees C or below (i.e. well below the peritectic decomposition temperature) by the interaction of an impurity doped liquid phasefollowed by a precipitation and exaggerated grain growth.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 19:15:08