The ceramics of PbTiO 3 and its powders have been prepared by a sol-gel process. The constitution of its phase and structure was examined by x-ray diffraction and Fourier transform infrared spectroscopy. Characterization studies were performed to determine the effects of particle size and degree of tetragonality. The dielectric properties of ceramics and powders of PbTiO 3 , composited with paraffin, were measured from 1 MHz to 18 GHz. All samples exhibited evidence of relaxation phenomena in their dielectric spectra. The relaxation frequencies increased with decreasing particle size.
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Jiwei et al. (2001) studied this question.
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