TY - JOUR
T1 - Effect of Nd422 content on the trapped fields of Nd-Ba-Cu-O bulk superconductors
AU - Matsui, M.
AU - Sakai, N.
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.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both Jc-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag2O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag2O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.
AB - The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both Jc-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag2O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag2O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.
KW - Bulk
KW - Nd-Ba-Cu-O
KW - Nd422
KW - Pinning force
KW - Trapped field
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U2 - 10.1016/S0921-4534(02)01531-9
DO - 10.1016/S0921-4534(02)01531-9
M3 - Article
AN - SCOPUS:17144432618
VL - 378-381
SP - 732
EP - 737
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - PART 1
ER -