Bi26Mo10O69–based solid solution with nonmetal dopants: Synthesis and properties

Abstract

A series of S- and P- doped Bi26Mo10O69 was synthesized by conventional solid state method and studied. Chemical analysis detected closeness of experimental and theoretical ratios of bismuth, molybdenum and dopant for P-doped samples and 50% deficiency of sulfur for S-doped samples. The solid solutions ranges were determined to be x = 0–0.7 for Bi26Mo10−2xP2xO69−d and x = 0–0.6 for Bi26Mo10−2xSxO69−d. Stabilization of the monoclinic form is observed when x > 0.1 for P and x > 0.4 for S doping. The IR FT spectroscopy and Rietveld whole profile structure refinement at X-Ray diffraction data showed substitution of Mo by S and P forming SO4 and PO4 groups. The geometrical sizes of particles were determined to be in the range of 1–20 μm. Materials under study are characterized with total ionic conductivity of the 1 × 10−4 − 9 × 10−3 S cm−1 at 273–1073 K.