| EFFECT OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y |
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| 作者姓名： | ZHANG Hong Shanghai Institute of Metallurgy Academia Sinica Shanghai China |
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| 作者单位： | ZHANG Hong Shanghai Institute of Metallurgy，Academia Sinica，Shanghai，China |
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| 摘 要： | 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 influencesobviously 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 Iineshape parameter,with annealing temperature;the bulk lifetime ofpositron annihilation in the glassy state is longer than that in the crystalline one.Positronannihilation spectroscopy could be used for studying structure of glassy BPSCCO andits change with heat treatment.
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| 收稿时间： | 1992-10-11 |
| 修稿时间： | 1992-10-11 |
EFFECT OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y |
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| ZHANG Hong Shanghai Institute of Metallurgy,Academia Sinica,Shanghai,China.EFFECT OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y[J].Acta Metallurgica Sinica(English Letters),1992,5(10):306-310. |
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| Authors: | ZHANG Hong |
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| Affiliation: | ZHANG Hong Shanghai Institute of Metallurgy,Academia Sinica,Shanghai,China |
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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_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. |
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| Keywords: | Bi oxide superconductor positron annihilation gipsy state crystallization Bi_(1 6)Pb_(0 4)Sr_(1 9)Ca_2Cu_(3 1)O_y |
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