Structural phase-transition in a superionic conductor na2(la,al)zr(po4)3 - positron-annihilation study

Sreepad, H. R. and Sreeramalu, V. and Chandrashekara, A. and Ravindrachary, V. and Gopal, S. (1990) Structural phase-transition in a superionic conductor na2(la,al)zr(po4)3 - positron-annihilation study. Physica Status Solidi A-Applied Research, 120 (2). pp. 411-417.

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Abstract

Positron lifetime measurements are made in a Nasicon analogue Na2(La, Al)Zr(PO4)3 with 2.8 wt% of ZrO2 in the nutrient under an isochronal annealing cycle from 25 to 275 °C in steps of 25 K. The analysis of the lifetime spectra is best fitted to two lifetime components. The second lifetime component is attributed to the positron trapping at structural vacancies, vacancyclusters, and tetrahedral voids present in the material. A diffuse phase transition observed at 125 °C confirms the fact that the thermal effct associated with the transition in a Nasicon is weak and is spread over a large temperature range. Positron trapping rate is calculated using the two state trapping model. The activation energy is also calculated using the same, and is found to be 0.11 eV.

Item Type:	Article
Uncontrolled Keywords:	Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	Dr Raju C
Date Deposited:	21 Jan 2021 10:00
Last Modified:	28 Oct 2022 05:33
URI:	http://eprints.uni-mysore.ac.in/id/eprint/14324

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