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Diffusivity is the quantitative measure of the relaxor nature of a ferroelectric material. The observed electrocaloric effect of the relaxor ferroelectrics due to the change of diffusivity are reported in this article. Four samples with diffusivities 1.55, 1.72, 1.94 and 2.18 are prepared by precisely doping La in Pb (Zr0.65Ti0.35)O3 [i.e. PZT (65/35)], from 6% to 9%. These values are deduced from...
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