Abstract： The size effects on the crystallite structure, Raman spectra as well as phase tian-sition in lanthanum-modified lead titanate Pb1-xLaxTi1-3/4xO3(x=0.14) (PLT14) nanocrystalline powders were investigated. The results show that with decreasing grain size, the crystallite structure changes from tetragonal perovskite phase to cubic perovskite phase; the soft mode frequency at room temperature decreases, and disappears when the grain size is as small as 19nm; the phase transition temperature from ferroelectric to paraelectric shifts towards a low temperature region. The phase transition in nanocrystalline PLT14 is a second order one, which is confirmed by its dielectric constant measurement.
WANG Xiaohui;WANG Zichen;ZHAO Muyu;MENG Jinfang*;LI Jiangping*;ZOU Guangtian*. Size Effects on the Crystallite Structure and Phase Transition in Lanthanaum-Modified Lead Titanate Nanocrystals
[J]. 中国物理快报, 1994, 11(9): 581-584.
WANG Xiaohui, WANG Zichen, ZHAO Muyu, MENG Jinfang*, LI Jiangping*, ZOU Guangtian*. Size Effects on the Crystallite Structure and Phase Transition in Lanthanaum-Modified Lead Titanate Nanocrystals
. Chin. Phys. Lett., 1994, 11(9): 581-584.
1994, Vol. 11 
