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Size effect for lead zirconate titanate nano-particles with PZT(40/60) composition

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This paper focuses on the size effect for lead zirconate titanate. Pb(Zr0.4Ti0.6)O3(PZT40) nano-particles with different sizes were prepared by the sol–gel method. The crystal size and structure were determined by X-ray diffraction. As a result, the c/a ratio (tetragonality) was close to 1 with decreasing particle size. Raman spectra for PZT40 nano-particles of various sizes have been observed to exhibit a decrease in the soft mode at around 35 nm, suggesting the existence of a critical size for the PZT40 particles. The temperature dependence of Raman spectra clearly revealed that the Curie temperature for PZT40 nano-particles shifted toward lower temperatures due to the size effect. The intrinsic dielectric constants for PZT40 nano-particles calculated by the Lyddane–Saches–Teller relation increased with decreasing particle size. These results show that Raman scattering is a powerful tool to investigate ferroelectric materials.

Affiliations: 1: Department of Material Science, Graduate School of Engineering, Shizuoka University, 3-5-1 Johoku Hamamatsu 432-8561, Japan; 2: Faculty of Policy Management, Yokkaichi University, 1200 Kayo-cho, Yokkaichi 512-8512, Japan


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