Positron annihilation studies on nasicon analogues containing cation vacancies | Zendy

V. Sreeramalu | Zendy; H. R. Sreepad | Zendy; A. Chandrashekara | Zendy; V. Ravindrachary | Zendy; S. Gopal | Zendy

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Positron annihilation studies on nasicon analogues containing cation vacancies

Author(s) -

V. Sreeramalu,

H. R. Sreepad,

A. Chandrashekara,

V. Ravindrachary,

S. Gopal

Publication year - 1990

Publication title -

bulletin of materials science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.35

H-Index - 72

eISSN - 0973-7669

pISSN - 0250-4707

DOI - 10.1007/bf02744948

Subject(s) - positron , materials science , annihilation , positron annihilation , trapping , atomic physics , fast ion conductor , nuclear physics , chemistry , physics , electron , electrode , ecology , biology , electrolyte

Positron annihilation studies were carried out on the Nasicon analogue Na2(La, Al)Zr(PO4)3 compound for three different concentrations (2·2, 2·8 and 5·2 by wt.%) of ZrO2 in the nutrient. Angular correlation study of annihilated photons reveals that the defect concentration is maximum for 2·8 (wt.%) of ZrO2. Further, positron lifetime studies indicate that the positrons are trapped at cation vacancies. Application of a two-state trapping model to this system made it possible to evaluate the lifetime of positrons in the Bloch state and of positrons trapped at cation vacancies

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