金属水素化物 PdDx の超伝導相における格子欠陥の役割

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/12382
File
Title
金属水素化物 PdDx の超伝導相における格子欠陥の役割
Title Alternative
Role of lattice defects on superconducting phase in PdDx system
Author
氏名 井下 聖賀
ヨミ イノシタ セイガ
別名 Seiga INOSHITA
氏名 安塚 周磨
ヨミ ヤスヅカ シュウマ
別名 Syuma YASUZUKA
Subject
palladium, hydrogen, lattice defect, Cottrell cloud, spinodal decomposition
Abstract

The interactions of hydrogen with the lattice defects in palladium have attracted much attention because macroscopic properties such as hydrogen storage and metal embrittlement are markedly affected by H (D)-defect interactions. In this paper we report the inhomogeneous superconducting state in PdDx and the hydrogen absorption/desorption processes on annealed and unannealed Pd wires. Deuterium was loaded simultaneously with unannealed Pd wire in the “as received” condition and annealed Pd wire by electrolysis in 0.1M LiOD in D2O at room temperature. A superconducting (SC) state, however, is induced only for the unannealed Pd wire and is robust against time. Since the easier insertion and stronger trapping of D atoms is realized at the vacancies and dislocation cores, an SC region (relatively D-rich region) may be formed around the lattice defects and a nonSC region may be formed around the regions away from the dislocation cores and vacancies. In addition, we find that the reduction of x estimated from Tc is much smaller than reduction of x estimated from Ta, indicating the slower escape of D atoms in the SC region than in the nonSC region. This result suggests occurrence of the SC state is associated with the formation of a dense Cottrell cloud of D atoms at around lattice defects.

Journal Title
広島工業大学紀要. 研究編
Volume
55
Spage
1
Epage
5
Published Date
21-Feb
Publisher
広島工業大学
ISSN
1346-9975
NCID
AA11599110
Language
jpn
NIIType
Departmental Bulletin Paper
Text Version
出版社版
Set
it-hiroshima