Transactions of the INDIAN CERAMIC SOCIETY Vol. 66 2007
Ionic Transport through Heterogeneous Solids
Pages : 123-130
The conductivities of an ionic polycrystalline solid lithium iodide (LiI), covalent polycrystalline lithium aluminium titanium phosphate (LATP) glass-ceramic material, and Y(Sc)SZ with Al2O3 and Ba0.6Sr0.4TiO3 (0.6BST) additions were investigated. It was determined that blocking and space charge effects coexist in these heterogeneous solids. However, their magnitudes differ from one system to another. The most pronounced blocking effect was evident in the LATP-Al2O3 system, whereas a dominant space charge effect was observed in the LiI-Al2O3 system. The higher dielectric constant of 0.6BST enhanced the space charge effect and thus conductivity in the LATP-0.6BST system. In the Y(Sc)SZ-Al2O3 system the magnitudes of blocking and space charge effects were comparable. The space charge effect was also determined to be strongly temperature dependent.