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Titolo:
UNIDIRECTIONAL MICROSTRUCTURE FORMATION OF SM-BA-CU-O SUPERCONDUCTOR ON MELTING VIA PERITECTIC REACTION
Autore:
SUMIDA M; SHIOHARA Y; UMEDA T;
Indirizzi:
UNIV TOKYO,GRAD SCH ENGN,DEPT MET TOKYO 113 JAPAN ISTEC,SUPERCONDUCT RES LAB,DIV 4 TOKYO 135 JAPAN
Titolo Testata:
Nippon Kinzoku Gakkaishi
fascicolo: 9, volume: 61, anno: 1997,
pagine: 956 - 962
SICI:
0021-4876(1997)61:9<956:UMFOSS>2.0.ZU;2-9
Fonte:
ISI
Lingua:
JPN
Soggetto:
NDBA2CU3OY SUPERCONDUCTORS; SOLIDIFICATION MODEL; SYSTEM; GROWTH; JC; OXIDES;
Keywords:
SM1BA2CU3O7-D; SM2BA1CU1O5; OXIDE SUPERCONDUCTOR; MICROSTRUCTURE CONTROL; UNIDIRECTIONAL MELTING; PARTIAL MOLTEN MIXTURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M. Sumida et al., "UNIDIRECTIONAL MICROSTRUCTURE FORMATION OF SM-BA-CU-O SUPERCONDUCTOR ON MELTING VIA PERITECTIC REACTION", Nippon Kinzoku Gakkaishi, 61(9), 1997, pp. 956-962

Abstract

In this paper, solidification microstructure control of a partial molten mixture is discussed. Since finely dispersed non-superconductive high temperature stable phase (Sm2Ba1Cu1O5, Sm211) particles in the superconductive Sm1Ba2Cu3O7-d (Sm123) can act as effective pinning centers and grain boundaries play as weak-links of electric transport, single crystalline Sm123 with finely dispersed Sm211 particles is required to improve the critical current density (J(c)). To obtain the bulk single crystalline Sm123 with fine Sm211 particles by floating-zone partial melting and the solidification method, the microstructure of the partial molten mixture (Sm211 particles and liquid) is to be controlled,because the solidification microstructure of Sm123/211 is mainly determined by that of the mixture. During unidirectional melting, the meandiameter, d(211), (or spacing, lambda) of rod-likely aligned Sm211 particles after decomposition of the precursor Sm123 decreased with increasing growth rate, R. The mean diameter d(211) became larger under P-O2=1 kPa atomsphere than that at atomspheric pressure. Based upon the experimental results, a simple model for the formation of aligned Sm211 particles via peritectic decomposition was proposed, and prediction from the model was compared with the experimental results. Effects of melting conditions on the microstructure formation of the partial molten mixture were discussed.

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Documento generato il 19/09/20 alle ore 11:47:12