Effect of silver addition on the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductors

Shinya Nariki, Naomichi Sakai, Motohide Matsui, Masato Murakami

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of Ag addition on the microstructure and the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductor has been investigated. The single grain Gd-Ba-Cu-O bulk superconductors 32 mm in diameter were fabricated with 0-30 mass%Ag2O additions by the melt growth method under controlled oxygen partial pressure of 1.0%. From microscopic observations, it was found that the macro-cracks in the a-b plane decreased with Ag addition. The three-point bending test showed that the average strength of Ag-free bulk was 69 MPa at room temperature, while the strength was dramatically improved to 110-115 MPa with 10-30 mass%Ag2O additions. The trapped magnetic field of Ag-free bulk sample was 1.3 T at 77 K. The trapped field of bulk Gd-Ba-Cu-O samples with 10-20 mass%Ag2O exhibited high values of 1.8-2.0 T at 77 K. However, the trapped field of the sample with 30 mass%Ag2O addition was lowered to 1.1 T with decreasing the critical current density. The trapped field of Ag-added sample did not deteriorate with thermal cycles. The trapped fields at lower temperatures were also measured for the Ag-free and 20 mass%Ag2O added bulk samples without reinforcement by the metal ring or resin. The Ag-free bulk exhibited the trapped field of 3.0 T at 65 K, however, the bulk was fractured at lower temperature due to an electromagnetic force. On the other hand, the Ag-added bulk could trap the higher field of 6.7 T at 55 K, thanks to the improvement in mechanical strength.

Original languageEnglish
Pages (from-to)309-314
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume66
Issue number4
Publication statusPublished - 2002 Apr
Externally publishedYes

Fingerprint

Silver
Superconducting materials
trapping
silver
Bending tests
Partial pressure
Temperature
Strength of materials
Macros
trapped magnetic fields
Reinforcement
Resins
Metals
Magnetic fields
Oxygen
Cracks
Microstructure
reinforcement
resins
partial pressure

Keywords

  • Crack
  • Critical current density
  • GdBaCuO
  • Mechanical property
  • Melt-g rowth
  • Silver
  • Superconductor
  • Three point bending strength
  • Trapped magnetic field

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

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title = "Effect of silver addition on the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductors",
abstract = "The effect of Ag addition on the microstructure and the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductor has been investigated. The single grain Gd-Ba-Cu-O bulk superconductors 32 mm in diameter were fabricated with 0-30 mass{\%}Ag2O additions by the melt growth method under controlled oxygen partial pressure of 1.0{\%}. From microscopic observations, it was found that the macro-cracks in the a-b plane decreased with Ag addition. The three-point bending test showed that the average strength of Ag-free bulk was 69 MPa at room temperature, while the strength was dramatically improved to 110-115 MPa with 10-30 mass{\%}Ag2O additions. The trapped magnetic field of Ag-free bulk sample was 1.3 T at 77 K. The trapped field of bulk Gd-Ba-Cu-O samples with 10-20 mass{\%}Ag2O exhibited high values of 1.8-2.0 T at 77 K. However, the trapped field of the sample with 30 mass{\%}Ag2O addition was lowered to 1.1 T with decreasing the critical current density. The trapped field of Ag-added sample did not deteriorate with thermal cycles. The trapped fields at lower temperatures were also measured for the Ag-free and 20 mass{\%}Ag2O added bulk samples without reinforcement by the metal ring or resin. The Ag-free bulk exhibited the trapped field of 3.0 T at 65 K, however, the bulk was fractured at lower temperature due to an electromagnetic force. On the other hand, the Ag-added bulk could trap the higher field of 6.7 T at 55 K, thanks to the improvement in mechanical strength.",
keywords = "Crack, Critical current density, GdBaCuO, Mechanical property, Melt-g rowth, Silver, Superconductor, Three point bending strength, Trapped magnetic field",
author = "Shinya Nariki and Naomichi Sakai and Motohide Matsui and Masato Murakami",
year = "2002",
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language = "English",
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journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
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TY - JOUR

T1 - Effect of silver addition on the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductors

AU - Nariki, Shinya

AU - Sakai, Naomichi

AU - Matsui, Motohide

AU - Murakami, Masato

PY - 2002/4

Y1 - 2002/4

N2 - The effect of Ag addition on the microstructure and the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductor has been investigated. The single grain Gd-Ba-Cu-O bulk superconductors 32 mm in diameter were fabricated with 0-30 mass%Ag2O additions by the melt growth method under controlled oxygen partial pressure of 1.0%. From microscopic observations, it was found that the macro-cracks in the a-b plane decreased with Ag addition. The three-point bending test showed that the average strength of Ag-free bulk was 69 MPa at room temperature, while the strength was dramatically improved to 110-115 MPa with 10-30 mass%Ag2O additions. The trapped magnetic field of Ag-free bulk sample was 1.3 T at 77 K. The trapped field of bulk Gd-Ba-Cu-O samples with 10-20 mass%Ag2O exhibited high values of 1.8-2.0 T at 77 K. However, the trapped field of the sample with 30 mass%Ag2O addition was lowered to 1.1 T with decreasing the critical current density. The trapped field of Ag-added sample did not deteriorate with thermal cycles. The trapped fields at lower temperatures were also measured for the Ag-free and 20 mass%Ag2O added bulk samples without reinforcement by the metal ring or resin. The Ag-free bulk exhibited the trapped field of 3.0 T at 65 K, however, the bulk was fractured at lower temperature due to an electromagnetic force. On the other hand, the Ag-added bulk could trap the higher field of 6.7 T at 55 K, thanks to the improvement in mechanical strength.

AB - The effect of Ag addition on the microstructure and the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductor has been investigated. The single grain Gd-Ba-Cu-O bulk superconductors 32 mm in diameter were fabricated with 0-30 mass%Ag2O additions by the melt growth method under controlled oxygen partial pressure of 1.0%. From microscopic observations, it was found that the macro-cracks in the a-b plane decreased with Ag addition. The three-point bending test showed that the average strength of Ag-free bulk was 69 MPa at room temperature, while the strength was dramatically improved to 110-115 MPa with 10-30 mass%Ag2O additions. The trapped magnetic field of Ag-free bulk sample was 1.3 T at 77 K. The trapped field of bulk Gd-Ba-Cu-O samples with 10-20 mass%Ag2O exhibited high values of 1.8-2.0 T at 77 K. However, the trapped field of the sample with 30 mass%Ag2O addition was lowered to 1.1 T with decreasing the critical current density. The trapped field of Ag-added sample did not deteriorate with thermal cycles. The trapped fields at lower temperatures were also measured for the Ag-free and 20 mass%Ag2O added bulk samples without reinforcement by the metal ring or resin. The Ag-free bulk exhibited the trapped field of 3.0 T at 65 K, however, the bulk was fractured at lower temperature due to an electromagnetic force. On the other hand, the Ag-added bulk could trap the higher field of 6.7 T at 55 K, thanks to the improvement in mechanical strength.

KW - Crack

KW - Critical current density

KW - GdBaCuO

KW - Mechanical property

KW - Melt-g rowth

KW - Silver

KW - Superconductor

KW - Three point bending strength

KW - Trapped magnetic field

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M3 - Article

VL - 66

SP - 309

EP - 314

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 4

ER -