希土類123系酸化物超電導体の包晶凝固における高温安定相211粒子の捕捉挙動

遠藤 昭彦, 渡辺 靖雄, 三宅 功一, 梅田 高照, 村田 清, 塩原 融

doi:10.2320/jinstmet1952.61.9_963

書誌事項

タイトル別名

Entrapment Behavior of RE211 Particles in Peritectic Solidification of RE123 Oxide Superconductors
キドルイ 123ケイサンカブツチョウデンドウタイノホウショウギョウコ

公開日: 1997

DOI

10.2320/jinstmet1952.61.9_963

公開者: 公益社団法人日本金属学会

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説明

Pushing/entrapment phenomenon of the high temperature stable phase, RE₂BaCuO₅ (RE211; RE=Y, Sm) during peritectic solidification of REBa₂Cu₃O_7−δ (RE123) oxide superconductors was investigated. The RE123 crystals were grown at different undercoolings by isothermal solidification processing combined with the seeding method. In the Y-system , distribution and preferred orientation of trapped Y211 particles in solidified Y123 crystals depended on the growth direction and the growth rate as a function of undercooling. These phenomena could be at least qualitatively explained by the prevalent trapping/pushing theory considering the peritectic reaction as well as the faceted materials. In the Sm-system, a similar behavior of Sm211 particles was observed only in the Ba-enriched composition displaced from the Sm211-Sm123 tie-line. The results suggested that the variation of liquid composition altered the solid/liquid interfacial energy, which is one of the determining factors of particle pushing.

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日本金属学会誌

日本金属学会誌 61 (9), 963-971, 1997

公益社団法人日本金属学会

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