摘要
研究了等时退火对玻璃态Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y正电子湮没特性的影响,指出晶化对正电子湮没特性有明显影响,平均寿命和Doppler线形参数峰翼比在晶化温区出现极大值,玻璃态的特征寿命大於晶态体寿命,正电子湮没谱术可应用於探测玻璃态的结构及其变化。
Effects of isochronal annealing on the positron annihilation of glassy Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y(BPSCCO) have been reported. It is shown that the crystallization in- fluences obviously the positron annihilation characteristics of BPSCCO. A maximum is found inthe region of crystallization temperature in curves of mean lifetime and peak / wing ratio, one of Doppler lineshape parameter, with annealing temperature; the bulk lifetime of positron annihi-lation in the glassy state is longer than that in the crystalline one. Positron annihilation spectroscopy could be used for studying structure of glassy BPSCCO and its change with heattreatment.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第2期B075-B079,共5页
Acta Metallurgica Sinica
基金
国家超导技术联合研究中心提供部份经费资助
关键词
超导氧化物
正电子湮没
玻璃态
Bi oxide superconductor
positron annihilation
glassy state
crystallization
