Fabrication and characterization of LRE1+xBa2-xCu3Oy (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure

M. Muralidhar; N. Sakai; M. Jirsa; M. Murakami

doi:10.1016/S0921-4534(02)01513-7

Fabrication and characterization of LRE_1+xBa_2-xCu₃O_y (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure

M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We studied the effect of oxygen partial pressure reduction to 0.05% during melt processing of NdBa₂Cu₃O_y, EuBa₂Cu₃O_y, GdBa₂Cu₃O_y, and (Nd,Eu,Gd)Ba₂Cu₃O_y on magnetic properties and microstructure. The superconducting transition of all the optimally oxygenated samples was as narrow as in those prepared in pO₂ of 0.1%, the onset temperature of the present samples was slightly higher or at least same as for 0.1% pO₂. Optical and scanning electron microscopy showed that in the GdBa₂Cu₃O_y and EuBa₂Cu₃O_y clusters are formed of sub-micron sized secondary phase particles. In other two compounds the secondary phase was uniformly dispersed. Magnetic properties of the present samples were always better at low fields than those of the samples prepared in 0.1% pO₂. The irreversibility field data were rather controversial, in some samples improved, in others worse.

Original language	English
Pages (from-to)	646-650
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01513-7
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

Critical current density (J)
Flux pinning
LRE-BaCuO
Melt processing
Microstructure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(02)01513-7

Cite this

@article{287df483f6934550b12e5c37870831d4,

title = "Fabrication and characterization of LRE1+xBa2-xCu3Oy (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure",

abstract = "We studied the effect of oxygen partial pressure reduction to 0.05% during melt processing of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd,Eu,Gd)Ba2Cu3Oy on magnetic properties and microstructure. The superconducting transition of all the optimally oxygenated samples was as narrow as in those prepared in pO2 of 0.1%, the onset temperature of the present samples was slightly higher or at least same as for 0.1% pO2. Optical and scanning electron microscopy showed that in the GdBa2Cu3Oy and EuBa2Cu3Oy clusters are formed of sub-micron sized secondary phase particles. In other two compounds the secondary phase was uniformly dispersed. Magnetic properties of the present samples were always better at low fields than those of the samples prepared in 0.1% pO2. The irreversibility field data were rather controversial, in some samples improved, in others worse.",

keywords = "Critical current density (J), Flux pinning, LRE-BaCuO, Melt processing, Microstructure",

author = "M. Muralidhar and N. Sakai and M. Jirsa and M. Murakami",

note = "Funding Information: This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. M.J. acknowledges support from grant no. A1010919/99 of GA ASCR.",

year = "2002",

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T1 - Fabrication and characterization of LRE1+xBa2-xCu3Oy (LRE

T2 - Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure

AU - Muralidhar, M.

AU - Sakai, N.

AU - Jirsa, M.

AU - Murakami, M.

N1 - Funding Information: This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. M.J. acknowledges support from grant no. A1010919/99 of GA ASCR.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - We studied the effect of oxygen partial pressure reduction to 0.05% during melt processing of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd,Eu,Gd)Ba2Cu3Oy on magnetic properties and microstructure. The superconducting transition of all the optimally oxygenated samples was as narrow as in those prepared in pO2 of 0.1%, the onset temperature of the present samples was slightly higher or at least same as for 0.1% pO2. Optical and scanning electron microscopy showed that in the GdBa2Cu3Oy and EuBa2Cu3Oy clusters are formed of sub-micron sized secondary phase particles. In other two compounds the secondary phase was uniformly dispersed. Magnetic properties of the present samples were always better at low fields than those of the samples prepared in 0.1% pO2. The irreversibility field data were rather controversial, in some samples improved, in others worse.

AB - We studied the effect of oxygen partial pressure reduction to 0.05% during melt processing of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd,Eu,Gd)Ba2Cu3Oy on magnetic properties and microstructure. The superconducting transition of all the optimally oxygenated samples was as narrow as in those prepared in pO2 of 0.1%, the onset temperature of the present samples was slightly higher or at least same as for 0.1% pO2. Optical and scanning electron microscopy showed that in the GdBa2Cu3Oy and EuBa2Cu3Oy clusters are formed of sub-micron sized secondary phase particles. In other two compounds the secondary phase was uniformly dispersed. Magnetic properties of the present samples were always better at low fields than those of the samples prepared in 0.1% pO2. The irreversibility field data were rather controversial, in some samples improved, in others worse.

KW - Critical current density (J)

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KW - Microstructure

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