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A conventional solid-state method was used to prepare Pb(Fe1/3Ti1/3W1/3)O3  single perovskite material. The sample sintered at 900°C was studied by XRD  and after Rietveld refinement the orthorhombic structure with Pbam space  group was confirmed. The FTIR frequency bands corresponding to Pb-O, Ti-O,  O-lattice, W- O-W and Fe-O stretching vibrations together with the XRD data  also confirmed that Fe2+ and W6+ ions are incorporated in the structure and  most probably substituted Ti4+ ions at the B site of the perovskite ABO3  structure. The average grain size of the perovskite ceramics, estimated from  SEM micrograph, was 1 to 2 μm. Variation of dielectric properties and AC  conductivity with frequency and temperature revealed that the material had  semiconducting nature and negative temperature coefficient of resistance  (NTCR). The Nyquist plots were modelled with an equivalent circuit consisted  of parallel capacitance, resistance and constant phase element corresponding  to the grains (bulk) and grain boundaries. It was observed that grain  resistance (Rb) of the sample decreases with the rise of temperature, which  supports the NTCR behaviour. The semi-circular arcs of the Nyquist and  Cole-Cole plots confirm the semiconducting nature of the sample.

Structure, electric and dielectric properties of PbFe1/3Ti1/3W1/3O3 single perovskite compound