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High-pressure studies on lithium fast-ion conductors

Published online by Cambridge University Press:  31 January 2011

D. Mazumdar ,
D. N. Bose ,
G. Parthasarathy  and
E. S. R. Gopal
D. Mazumdar
Affiliation:
Materials Science Centre, Indian Institute of Technology, Kharagpur, India 721 302
D. N. Bose
Affiliation:
Materials Science Centre, Indian Institute of Technology, Kharagpur, India 721 302
G. Parthasarathy
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India 560 012
E. S. R. Gopal
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India 560 012
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Abstract

The variation of resistivity of the lithium fast-ion conductor Li3+y Ge1−yO4 (y = 0.25, 0.6, 0.72) has been studied with hydrostatic pressure up to 70 kbar and compared with that of Li16−2x Znx (GeO4)4(x = 1, 2). Both types showed pronounced resistivity maxima between 20–30 kbar and marked decrease thereafter. Measurements as a function of temperature between 120–300 K permitted the determination of activation energies and prefactors that also showed corresponding maxima. The activation volumes (ΔV) of the first type of compound varied between 4.34 to −4.90 cm3/mol at 300 K and decreased monotonically with increasing temperature. For the second type ΔV was much smaller, varied with pressure between 0.58 and −0.24 cm3/mol, and went through a maximum with increasing temperature. High-pressure studies were also conducted on aged samples, and the results are discussed in conjunction with results of impedance measurements and nuclear magnetic resonance (NMR) studies. The principal effect of pressure appears to be variations of the sum of interatomic potentials and hence barrier height, which also causes significant changes in entropy.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 3 , June 1987 , pp. 366 - 373
Copyright
Copyright © Materials Research Society 1987

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References

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