Patent ID: 8246863

Claim:
A metal ion conducting ceramic material having a structure providing high metal cation conductivity having the general formulation: Me 1+x+y−z M III y M IV 2−y Si x P 3−x O 12−z/2 wherein Me is Na + , Li + , K + , Rb + , Cs + , Ag + , or mixtures thereof, 2.0≦x≦2.4, 0.0≦y≦1.0, and 0.25≦z≦0.9, where M III is Al 3+ , Ga 3+ , Cr 3+ , Sc 3+ , Fe 3+ , In 3+ , Yb 3+ , Y 3+ , or mixtures thereof and M IV is Ti 4+ , Zr 4+ , Hf 4+ , or mixtures thereof.