CONDUCTION CHARACTERISTICS OF SOME LITHIUM FLUORIDE BASED SYSTEMS

A systematic approach of homogeneously and heterogeneously doping, a low ion conducting material, lithium fluoride (LiF), is adopted to influence the ionic conductivity. Homogeneous doping of the aliovalent ion (Mg2+) for 1500 ppm in lithium fluoride depicts higher ionic conductivity as compared to 1000 ppm and 2000 ppm doping levels. The heterogeneously doped samples with gamma-Al2O3 show better conduction characteristics with an ionic conductivity of 5.9 x 10(-5) S cm(-1) for the smallest particle size of 20 nm with a concentration level of 10 mol%. The variation of ionic conductivity with particle size and concentration of Al2O3 is discussed in the light of space charge layer model. Further, the influence of LiF on the Li+ dynamics in the disordered glass matrix 60Li(2)O-40P(2)O(5) has been investigated.