Size Effects on the Crystallite Structure and Phase Transition in Lanthanaum-Modified Lead Titanate Nanocrystals

Chin. Phys. Lett.

1994, Vol. 11

Issue (9): 581-584 DOI:

Original Articles

Size Effects on the Crystallite Structure and Phase Transition in Lanthanaum-Modified Lead Titanate Nanocrystals

WANG Xiaohui;WANG Zichen;ZHAO Muyu;MENG Jinfang^*;LI Jiangping^*;ZOU Guangtian^*

Department of Chemistry, Jilin University, Changchun 130023 ^*Department of Physics, Jilin University, Changchun 130023

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WANG Xiaohui, WANG Zichen, ZHAO Muyu et al 1994 Chin. Phys. Lett. 11 581-584

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Abstract The size effects on the crystallite structure, Raman spectra as well as phase tian-sition in lanthanum-modified lead titanate Pb_1-xLa_xTi_1-3/4xO₃(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.

Keywords: 77.80.Bh 78.30.Hv 81.30.Dz

Published: 01 September 1994

PACS:	77.80.Bh
	78.30.Hv	(Other nonmetallic inorganics)
	81.30.Dz	(Phase diagrams of other materials)

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	WANG Xiaohui
	WANG Zichen
	ZHAO Muyu
	MENG Jinfang
	LI Jiangping
	ZOU Guangtian

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