Synthesis and electrophysical properties of some rare-earth molybdates with fluorite-like structure of the Nd5Mo3O16 type

Polycrystalline samples of PbLn ₄Mo₃O₁₆ (Ln = La, Pr, Nd, or Sm), CdLn ₄Mo₃O₁₆ (Ln = La, Nd, Sm, Eu, or Tm), and PbLa_4–xNd_xMo₃O₁₆ (0 ≤ x ≤ 3) with the cubic fluorite-like structure and sp. gr. Pn n have been obtained by solid-phase synthesis in air. The specific conductivity of lead compounds is established to reach 10^–2 S/cm (which is an order of magnitude higher than that for cadmium compounds). The conductivity value is shown to reach a maximum at a concentration ratio of rare-earth elements of Nd: La = 1: 1.