Jf. Meng et al., TEMPERATURE-INDUCED PHASE-TRANSITION AND MORPHOTROPIC PHASE-BOUNDARY IN THE NANOCRYSTALLINE PB1-XSRXTIO3 SYSTEM, Journal of physics. Condensed matter, 6(32), 1994, pp. 6549-6556
The Raman spectra in the nanocrystalline Pb1-xSrxTiO3 system show that
the morphotropic phase transition from the tetragonal phase to the cu
bic structure occurs at x(c) = 0.57 and it can be associated with 'sof
tening' of the lowest-frequency E(TO) phonon mode. The phase transitio
n temperature in Pb0.8Sr0.2TiO3 decreases with decreasing grain size.
The disappearance of the ferroelectric phase of Pb0.8Sr0.2TiO3 has bee
n discussed as a function of grain size. The correlation between the t
emperature-induced and the Sr-concentration-induced phase transition i
n nanocrystalline Pb1-xSrxTiO3 has been observed.