Synthesis, conductivity and structural characterization of phosphorous bronzes originating from heteropolyacids. Relation with similar proton containing phases

Abstract The phosphorus doped molybdenum oxide compound (P 0.18 Mo 4.00 O 12.66 ), isostructural with molybdite was synthesized in the process of thermally induced phase transformation of 12-molybdophosphoric acid. The synthesized phases (low and high temperature) and the precursor compound ( Q -phase) have been characterized by thermal (DTA and TGA), X-ray powder diffraction, electron scanning microscopy and spectroscopic (IR) methods. The temperature dependence of electric conductivity σ ( ω → 0) is discussed. It was concluded that the electronic conductivities of bronzes obtained from heteropolyacids are very similar to those of corresponding anhydrous polyacids.