Lithium ion conductivity in new Li-ADPESSs La_(0.56-X)M(I)_XLi_(0.33)Ta_(2X)Ti_(l-2X)O_3

摘要

This paper describes the formation of Li-ADPESSs based on the substitution mechanism, La~(3+)+ 2Ti~(4+)→ M~++2Ta~(5+), in the series [M(I)-series] of composition La_(0.56-X)M(I)_XLi_(0.33)Ta_(2X)Ti_(l-2X)O_3 [M(I) =Na,K,Rb,Cs,Ag], Li-ADPESSs formed at least up to X=03 in the Na-series and X=0.2 in the Ag-series, and in a range of X≤0.1 for the K-series, while no single phase of ADPESS formed in a range of X≧0.05 for the Rb- and Cs-series. The bulk conductivity (σ_b) decreased with increasing M(I) content in all the series. The controlling factors for σ_b, are discussed in relation to the result that σ_b, decreased the most steeply in the Na-series despite of almost no change in the cell volume.