Internal friction of superconducting YBa2Cu3O6+x wires at 200 kHz under in situ heat treatment

被引：0
作者：
Masakuni Ozawa
Masahiko Inagaki
Suguru Suzuki
机构：
[1] Nagoya Institute of Technology,
[2] CRL,undefined
来源：
Journal of Electronic Materials | 1999年 / 28卷
关键词：
Internal friction; superconducting wire; modulus; phase transition; YBa; Cu; O;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Using piezoelectric LiNbO3 crystal oscillator method at 200 kHz, we have measured internal friction and modulus of YBa2Cu3O6+x short wires with 1 mm-diameter and about 5mm length under in situ cyclic heating-cooling treatment at temperatures of 300–1020K. Polycrystalline YBa2Cu3O6+x wires show anelastic behavior as well as orthorhombic-to-tetragonal (O-T) phase transition within present temperature range. There appears a strong internal friction peak below the O-T transition temperature, corresponding to the atomic site relaxation between oxygen and a vacancy in the Cu-O plane of oxygen defective YBa2Cu3O6+x. A novel peak is observed after the cyclic heat treatments at around 700K. This relaxation is attributed to the hopping movement of oxygen in the defective local structure of YBa2Cu3O6+x.
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页码：1032 / 1037
页数：5
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