Abstract
The complex polycrystalline ceramic sample of Na 2Pb 2Sm 2W 2Ti 4Nb 4O 30 was prepared by a high temperature solid-state reaction technique. Preliminary X-ray diffraction (XRD) studies of the compound showed the formation of single-phase compound in an orthorhombic crystal structure at room temperature. Studies of dielectric properties ( ɛ, tan δ) of the above compound at frequencies 10, 100 and 1000 kHz and in a wide temperature range (273–700 K) exhibit a ferroelectric phase transition of diffuse type. Impedance spectroscopy study provides an insight into the electrical properties and understanding of types of relaxation process in the material. Temperature variation of dc resistivity/conductivity shows that this compound exhibits negative temperature coefficient of resistance (NTCR) at high temperature.
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