FT-Raman Spectra of Pb1-xCaxTiO3 nanocrystals with different lanthanum amou
nts were measured at 288 K and 378 K. Several nanocrystals of Pb0.85Ca0.15T
iO3 with different grain size were also prepared at 288 K. The effects of t
he amount of lanthanum, grain size and temperature on phonon frequency were
discussed in details. Furthermore, the conclusion that lattice expansion's
presentation in PCT nanocrystals can be obtained by the frequency comparis
on of PCT nanocrystal of x greater than or equal to 0.2 with ceramic doped
with the same amount of calcium.