High-pressure studies on lithium fast-ion conductors

Mazumdar, D. ; Bose, D. N. ; Parthasarathy, G. ; Gopal, E. S. R. (1987) High-pressure studies on lithium fast-ion conductors Journal of Materials Research, 2 (3). pp. 366-373. ISSN 0884-2914

Full text not available from this repository.

Official URL: http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=307...

Related URL: http://dx.doi.org/10.1557/JMR.1987.0366


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 (V) 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 V 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.

Item Type:Article
Source:Copyright of this article belongs to Materials Research Society.
ID Code:5808
Deposited On:19 Oct 2010 10:53
Last Modified:06 Jul 2012 05:02

Repository Staff Only: item control page