PbTiO3 glass-ceramics were produced by a sol-gel process. DTA and X-ray dif
fraction analysis provided information about the structural transformations
and crystallization temperature. The range of crystallization temperature
of PbTiO3 is larger than that of PbTiO3 glass-ceramics. By increasing the g
lass composition, the crystallization temperature was increased. The phase
transformation of PbTiO3 from the cubic to the tetragonal phase depends on
the crystal size caused by the different heat treatment temperatures. The d
ielectric measurements in high frequency range (> 10(7) Hz) exhibited evide
nce of a relaxation phenomena near 850 MHz. With increasing glass compositi
on, the position of the relaxation frequency was increased. The temperature
dependence of the dielectric constant of PbTiO3 and PbTiO3 glass-ceramics
has an obvious discrepancy. The dielectric constant of PbTiO3 glass-ceramic
s shows the characteristic dispersion at the Curie point. It indicated that
the glass ceramic sample has a stronger tendency for a diffuse phase trans
ition.