EFFECTS OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY BPSCCO

Acta Metall Sin

1992, Vol. 28

Issue (2): 77-81 DOI:

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EFFECTS OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY BPSCCO

ZHANG Hong Shanghai Institute of Metallurgy; Academia Sinica

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ZHANG Hong Shanghai Institute of Metallurgy; Academia Sinica. EFFECTS OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY BPSCCO. Acta Metall Sin, 1992, 28(2): 77-81.

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Abstract 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.

Key words: Bi oxide superconductor positron annihilation glassy state crystallization

Received: 18 February 1992

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