NASICON phases of variable composition K1−x A1−x R1+x (MoO4)3 (0 ≤ x ≤ 0.2–0.6), where A = Ni, Mg, Co, or Mn and R = Yb, Lu, or Sc

Phases of variable composition K1−x A1−x R1+x (MoO4)3) (0 ≤ x ≤ 0.2–0.6), where A = Ni, Mg, Co, or Mn and R = Yb, Lu, or Sc, which crystallize in a NASICON-type structure (space group R $$ \bar 3 $$ c) were synthesized by solid-phase reactions. Their crystal parameters were calculated, and IR and Raman spectra described.