Microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O

T. Saitoh, K. Segawa, K. Kamada, Naomichi Sakai, T. Segawa, S. I. Yoo, Masato Murakami

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We have studied the microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O composite bulks (RE and RE′ are two different rare earth elements selected from a group of Nd, Sm, Eu, Gd and Y). It was found that the peritectic decomposition temperatures (Tm) of the (RE,RE′)-Ba-Cu-O composites increased linearly with increasing the average ionic radius between two different rare earth elements. Large grain growth was observed in almost all the (RE,RE′)-Ba-Cu-O bulks except those containing Y, when they were melt-processed in a reduced oxygen atmosphere. Compositional analyses revealed that the ratio of RE to RE′ in the (RE,RE′)Ba2Cu3O7-d matrix phase was almost the same as that of the nominal composition, showing that the mixture of the two different rare earth elements was very uniform. All the samples showed onset superconducting transition temperatures (Tc) exceeding 93 K with a sharp transition, and exhibited a secondary peak effect in the M-H loops.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume288
Issue number1-2
Publication statusPublished - 1997 Aug 20
Externally publishedYes

Fingerprint

Rare earth elements
rare earth elements
microstructure
Microstructure
composite materials
Composite materials
Grain growth
Superconducting transition temperature
transition temperature
Oxygen
Decomposition
decomposition
atmospheres
radii
oxygen
matrices
Chemical analysis
Temperature
temperature

Keywords

  • (RE,RE′)-Ba-Cu-O
  • Decomposition temperature
  • Low oxygen partial pressure
  • Melt-processing
  • Superconductor

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O. / Saitoh, T.; Segawa, K.; Kamada, K.; Sakai, Naomichi; Segawa, T.; Yoo, S. I.; Murakami, Masato.

In: Physica C: Superconductivity and its Applications, Vol. 288, No. 1-2, 20.08.1997, p. 141-147.

Research output: Contribution to journalArticle

@article{23e7b900774c4b398734db08ba2dea6f,
title = "Microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O",
abstract = "We have studied the microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O composite bulks (RE and RE′ are two different rare earth elements selected from a group of Nd, Sm, Eu, Gd and Y). It was found that the peritectic decomposition temperatures (Tm) of the (RE,RE′)-Ba-Cu-O composites increased linearly with increasing the average ionic radius between two different rare earth elements. Large grain growth was observed in almost all the (RE,RE′)-Ba-Cu-O bulks except those containing Y, when they were melt-processed in a reduced oxygen atmosphere. Compositional analyses revealed that the ratio of RE to RE′ in the (RE,RE′)Ba2Cu3O7-d matrix phase was almost the same as that of the nominal composition, showing that the mixture of the two different rare earth elements was very uniform. All the samples showed onset superconducting transition temperatures (Tc) exceeding 93 K with a sharp transition, and exhibited a secondary peak effect in the M-H loops.",
keywords = "(RE,RE′)-Ba-Cu-O, Decomposition temperature, Low oxygen partial pressure, Melt-processing, Superconductor",
author = "T. Saitoh and K. Segawa and K. Kamada and Naomichi Sakai and T. Segawa and Yoo, {S. I.} and Masato Murakami",
year = "1997",
month = "8",
day = "20",
language = "English",
volume = "288",
pages = "141--147",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O

AU - Saitoh, T.

AU - Segawa, K.

AU - Kamada, K.

AU - Sakai, Naomichi

AU - Segawa, T.

AU - Yoo, S. I.

AU - Murakami, Masato

PY - 1997/8/20

Y1 - 1997/8/20

N2 - We have studied the microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O composite bulks (RE and RE′ are two different rare earth elements selected from a group of Nd, Sm, Eu, Gd and Y). It was found that the peritectic decomposition temperatures (Tm) of the (RE,RE′)-Ba-Cu-O composites increased linearly with increasing the average ionic radius between two different rare earth elements. Large grain growth was observed in almost all the (RE,RE′)-Ba-Cu-O bulks except those containing Y, when they were melt-processed in a reduced oxygen atmosphere. Compositional analyses revealed that the ratio of RE to RE′ in the (RE,RE′)Ba2Cu3O7-d matrix phase was almost the same as that of the nominal composition, showing that the mixture of the two different rare earth elements was very uniform. All the samples showed onset superconducting transition temperatures (Tc) exceeding 93 K with a sharp transition, and exhibited a secondary peak effect in the M-H loops.

AB - We have studied the microstructures and superconducting properties of melt-processed (RE,RE′)-Ba-Cu-O composite bulks (RE and RE′ are two different rare earth elements selected from a group of Nd, Sm, Eu, Gd and Y). It was found that the peritectic decomposition temperatures (Tm) of the (RE,RE′)-Ba-Cu-O composites increased linearly with increasing the average ionic radius between two different rare earth elements. Large grain growth was observed in almost all the (RE,RE′)-Ba-Cu-O bulks except those containing Y, when they were melt-processed in a reduced oxygen atmosphere. Compositional analyses revealed that the ratio of RE to RE′ in the (RE,RE′)Ba2Cu3O7-d matrix phase was almost the same as that of the nominal composition, showing that the mixture of the two different rare earth elements was very uniform. All the samples showed onset superconducting transition temperatures (Tc) exceeding 93 K with a sharp transition, and exhibited a secondary peak effect in the M-H loops.

KW - (RE,RE′)-Ba-Cu-O

KW - Decomposition temperature

KW - Low oxygen partial pressure

KW - Melt-processing

KW - Superconductor

UR - http://www.scopus.com/inward/record.url?scp=0031198929&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031198929&partnerID=8YFLogxK

M3 - Article

VL - 288

SP - 141

EP - 147

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 1-2

ER -