Phase relations in the Nd-Ba-Cu-O system in reduced oxygen atmospheres

S. Banzai, G. Osabe, Naomichi Sakai, M. Otsuka, Masato Murakami

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have studied the quasi-binary phase diagrams along the line connecting NdBa2Cu3Oy and BaCuO2+w in reduced oxygen atmospheres: p(O2) = 10-3 and 10-2 atm. The nucleation and melt of NdBa2Cu3Oy (Nd123) in Ba-rich solvent were observed in situ using a laser scanning microscope in 1% O2 + Ar and 0.1% O2 + Ar. The liquidus and solidus lines of nearly stoichiometric Nd123 have been constructed. We have found that phase relations are quite different between 1% O2 + Ar and 0.1% O2 + Ar. In a 0.1% O2 + Ar environment BaCuO2+w undergoes incongruent melting. (BaCuO2+w → Ba2CuO3+2 + L → BaO + L) and Nd422 decomposes into the Nd2O3 phase.

Original languageEnglish
Pages (from-to)633-636
Number of pages4
JournalSuperconductor Science and Technology
Volume13
Issue number6
DOIs
Publication statusPublished - 2000 Jun
Externally publishedYes

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solidus
liquidus
Phase diagrams
Melting
Microscopes
Nucleation
microscopes
phase diagrams
melting
nucleation
Oxygen
Scanning
atmospheres
scanning
Lasers
oxygen
lasers
neodymium oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics

Cite this

Phase relations in the Nd-Ba-Cu-O system in reduced oxygen atmospheres. / Banzai, S.; Osabe, G.; Sakai, Naomichi; Otsuka, M.; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 13, No. 6, 06.2000, p. 633-636.

Research output: Contribution to journalArticle

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abstract = "We have studied the quasi-binary phase diagrams along the line connecting NdBa2Cu3Oy and BaCuO2+w in reduced oxygen atmospheres: p(O2) = 10-3 and 10-2 atm. The nucleation and melt of NdBa2Cu3Oy (Nd123) in Ba-rich solvent were observed in situ using a laser scanning microscope in 1{\%} O2 + Ar and 0.1{\%} O2 + Ar. The liquidus and solidus lines of nearly stoichiometric Nd123 have been constructed. We have found that phase relations are quite different between 1{\%} O2 + Ar and 0.1{\%} O2 + Ar. In a 0.1{\%} O2 + Ar environment BaCuO2+w undergoes incongruent melting. (BaCuO2+w → Ba2CuO3+2 + L → BaO + L) and Nd422 decomposes into the Nd2O3 phase.",
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AU - Osabe, G.

AU - Sakai, Naomichi

AU - Otsuka, M.

AU - Murakami, Masato

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N2 - We have studied the quasi-binary phase diagrams along the line connecting NdBa2Cu3Oy and BaCuO2+w in reduced oxygen atmospheres: p(O2) = 10-3 and 10-2 atm. The nucleation and melt of NdBa2Cu3Oy (Nd123) in Ba-rich solvent were observed in situ using a laser scanning microscope in 1% O2 + Ar and 0.1% O2 + Ar. The liquidus and solidus lines of nearly stoichiometric Nd123 have been constructed. We have found that phase relations are quite different between 1% O2 + Ar and 0.1% O2 + Ar. In a 0.1% O2 + Ar environment BaCuO2+w undergoes incongruent melting. (BaCuO2+w → Ba2CuO3+2 + L → BaO + L) and Nd422 decomposes into the Nd2O3 phase.

AB - We have studied the quasi-binary phase diagrams along the line connecting NdBa2Cu3Oy and BaCuO2+w in reduced oxygen atmospheres: p(O2) = 10-3 and 10-2 atm. The nucleation and melt of NdBa2Cu3Oy (Nd123) in Ba-rich solvent were observed in situ using a laser scanning microscope in 1% O2 + Ar and 0.1% O2 + Ar. The liquidus and solidus lines of nearly stoichiometric Nd123 have been constructed. We have found that phase relations are quite different between 1% O2 + Ar and 0.1% O2 + Ar. In a 0.1% O2 + Ar environment BaCuO2+w undergoes incongruent melting. (BaCuO2+w → Ba2CuO3+2 + L → BaO + L) and Nd422 decomposes into the Nd2O3 phase.

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