MOSSBAUER EFFECT STUDY OF YBa<sub>2</sub>Cu<sub>3-x</sub>Sn<sub>x</

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M(?)ssbauer spectra measurements reveal that Sn exists in YBa<sub>2</sub>Cu<sub>3<sub>x</sub></sub>Sn<sub>x</sub>O<sub>7<sub>y</sub></sub> system(x=0.05,0.10,0.20,0.30 and 0.40)in for
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