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Influence of Isostatic Pressure on the Superconducting Performance of Nb 3 Al Prepared by Low‐Temperature Sintering
Author(s) -
Zhao Huanhuan,
Li Xinhua,
Ma Qingshuang,
Wen Xin,
Du Zunfeng,
Ma Zongqing
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900238
Subject(s) - sintering , materials science , superconductivity , powder metallurgy , stoichiometry , metallurgy , superconducting transition temperature , phase (matter) , high pressure , critical current , analytical chemistry (journal) , composite material , condensed matter physics , thermodynamics , chemistry , physics , organic chemistry , chromatography
The influence of isostatic sintering pressure on the superconducting performance of Nb 3 Al prepared by powder metallurgy is investigated. It is found that its superconducting transition temperature ( T c ) and critical current density ( J c ) are both improved with the increase in sintering pressure. Specifically, the T c of the 180 MPa sintered sample reaches nearly 16.2 K, and its J c is up to 1.1 × 10 4 A cm −2 (4.2K, 5T), an order of magnitude higher than that of the ambient sintered sample. The Nb/Al in the Nb 3 Al superconducting phase closer to the stoichiometric ratio of 3:1 in the pressure sintered samples is responsible for the increase in T c ; meanwhile, the reduced sintering micropores, refined grains, and more dislocations in the pressure sintered samples all contribute to the enhancement of their J c .
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