SOLID-STATE SODIUM ION CONDUCTOR AND METHOD OF MAKING THE SAME

A solid-state ion conductor includes a compound of the formula NaM2-(y+z) My Mz (AO) wherein M, M, and M are each independently Hf, Mg, Sc, In, Y, Ca, or Zr; A is P, Si, S, or a combination thereof; 3≤x≤3.5; 0.5≤y≤1; and 0≤z≤0.5. The solid-state ion conductor can be useful in various components of an electrochemical cell.