Structural and temperature dependent dielectric properties of nanocrystalline PbTiO3 synthesized through auto-igniting combustion technique

Abstract

Nanocrystalline PbTiO3 has been synthesized through an auto-ignited combustion method. The structure of the powder was examined using X-ray diffraction, thermogravimetric analysis, differential thermal analysis and Fourier Transform Raman spectroscopy. Rietveld-refinements were performed in order to determine the structural parameters of the material. The crystalline size of the particle was calculated using Scherrer formula and examined using transmission electron microscopy. The nanopowder could be sintered to 95% of the theoretical density at 1100 °C for a short duration of time 2 h. The microstructure of the sintered surface was examined using scanning electron microscopy. The variation of dielectric properties of the specimen was studied at different frequencies and temperatures. A maximum of dielectric constant 30901 obtained at 50 Hz when the temperature is 500 °C (near transition temperature, Tc). The excellent dielectric properties of the PbTiO3 ceramics at different conditions assure the sample is useful to many electronic devices.