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PHYSICAL PROPERTIES OF FERROELECTRIC BI4-xLAxTI3O12 NANO-PARTICLES SYNTHESIZED BY THE CHEMICAL CO-PRECIPITATION METHOD

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Abstract:

Bi4 - xLaxTi3O12 (BLT) nano-particles have been synthesised by the chemical co-precipitation method utilizing a polymeric precursor. The particle size decreases from 100 to 40 nm with the increase of La content (x = 0 ∼ 1) owing to the increase of a reaction temperature. The axial ratio a/b of BLT decreases with the increase of La content reflects a relaxation of structural distortion from its ideal tetragonal structure. A monoclinic to orthorhombic transition occurs at La > 0.75. The existence of the soft mode in Raman spectra above x = 0.75 demonstrates a displacive nature of orthorhombic to tetragonal phase transition. No noticeable size effect on physical properties is observed.

Keywords: layered ferroelectrics; nano-particles; soft mode

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10584580802540942

Affiliations: Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan

Publication date: January 1, 2008

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