Synthesis and electrical properties of double borates Ba3R(BO3)3, R = Ho, Yb, Sc

Polycrystalline samples of double barium borates of the composition Ba3R(BO3)3, R = Ho, Yb, Sc, were synthesized by the method of solid-phase reactions. The temperature dependence of the electrical conductivity of the compounds obtained was studied at 200–500°C.