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Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan
Center for Scientific Instrument Renovation and Manufacturing Support, Osaka University, Toyonaka 560-8531, Japan
Department of Electrical Engineering, Kyushu Sangyo University, Fukuoka 813-8503, Japan
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan
抄録
In fifth-group element superconductors V, Nb, and Ta, the increase in superconducting transition temperature (Tc) was attempted by using both high-pressure torsion (HPT) and additional hydrostatic pressure (HP) compression. The former brings about the grain refinement and strain accumulation in the unit-cell level. The additional compression for severely strained superconductors triggers strengthening intergrain-contact and/or structural deformation in the unit-cell level. The manner of the appearance of the above two effects depends on the kind of elements: First, in V, there is no prominent effect of HPT, comparing to the hydrostatic compression effects on its non-strained material. Next, in Ta, the effect of strengthening intergrain-contact appears at small hydrostatic compression, resulting in temporal increase in Tc. Finally, Nb exhibits prominent increase in Tc by both effects and, in particular, the structural deformation in the unit-cell level promotes the increase in Tc. Thus, the accumulation of residual strain in the level of starting material can be a promising work to manipulate Tc under HP compression.
雑誌名
Materials Transactions
巻
60
号
8
ページ
1472 - 1483
発行年
2019-08-01
出版者
日本金属学会
ISSN
1347-5320
1345-9678
書誌レコードID
AA1151294X
DOI
https://doi.org/10.2320/matertrans.MF201932
権利
Copyright (c) 2019 The Japan Institute of Metals and Materials
Hydrostatic Compression Effects on Fifth-Group Element Superconductors V, Nb, and Ta Subjected to High-Pressure Torsion
scunit-2020_02.pdf
(3.55MB)
