Abstract
A series of complex oxides of general formula Bi26Mo10-2xFe2xO69-3x was synthesized and studied. The solid solution formation ranges and polymorphic modification limits were determined. SEM investigations and chemical analysis showed homogenous samples and confirmed the theoretical concentrations of the dopant. High-resolution neutron and X-ray diffraction were used to describe the structural features of the solid solution at ambient and high temperatures (30–800 °C). Structure refinement was carried out by Rietveld analysis using a combination of X-ray and backscattered neutron data. Close inspection of the fit at room temperature revealed a non-centrosymmeric P1 space group and additional peaks associated with oxygen and/or magnetic ordering. Magnetic measurements showed the samples had low magnetic susceptibility and a magnetic transition at ~ − 20 °C. A.C. impedance spectroscopy was used to determine the electroconductive properties of Bi26Mo10-2xFe2xO69-3x. Two basic types of impedance curves were detected at low and high temperatures, correlated with a change from triclinic to monoclinic symmetry. Details of both the monoclinic and triclinic structures are discussed, with the variation of electroconductive properties explained by structural changes.
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