ZHANG Hong Shanghai Institute of Metallurgy
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Academia Sinica
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Shanghai
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China
金属学报(英文版)
Effects of isochronal annealing on the positron annihilation of glassy Bi_(1.6) Pb_(0.4) Sr_(1.9)Ca_2 Cu_(3.1)O_y(BPSCCO)have been reported.It is shown that the crystallization influences obviously the positron annihilation characteristics of BPSCCO.A maximum is found in the region of crystallization temperature in curves of mean lifetime and peak/wing ratio, one of Doppler Iineshape parameter,with annealing temperature;the bulk lifetime of positron annihilation 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 heat treatment.
关键词:
Bi oxide superconductor
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