放电等离子烧结细晶0.8PMN-0.2PT陶瓷的介电性能

doi:10.19964/j.issn.1006-4990.2024-0173

Abstract

Abstract:

Pb（Mg_1/3Nb_2/3）O₃-PbTiO₃（PMN-PT，lead magnesium niobate-lead titanate） ceramic is a typical relaxor ferroelectric material.In order to investigate the effect of grain size on the dielectric properties of PMN-PT ceramics，0.8PMN-0.2PT powder was synthesized using a two-step solid-state reaction method and 0.8PMN-0.2PT ceramics were prepared using a spark plasma sintering at different temperatures.The crystal structure，microstructure，and dielectric properties of the ceramics were analyzed.The results showed that pure 0.8PMN-0.2PT powder could be obtained by the two-step reaction method，and the grain size of the powder was about 0.36 μm.When the sintering temperature was 1 100 ℃，pure 0.8PMN-0.2PT ceramics with fine-grained was obtained by spark plasma sintering.The grain size was about 0.69 μm，the density was 8.02 g/cm³，but the dielectric constant was low，with the maximum value of 12 708.The dielectric-paraelectric transition peak was a very broad peak.With the increase of frequency，the dielectric-paraelectric transition temperature（T_c） moved towards the higher temperature，showing a typical relaxation characteristics.In addition，in the frequency range of 1×10² to 2×10⁶ Hz，both dielectric constant and dielectric loss were increased with increasing temperature.Therefore，dense 0.8PMN-0.2PT ceramics with fine-grained and high dielectric constant could be obtained by spark plasma sintering.

Key words: lead magnesium niobate-lead titanate ceramic, two-step reaction method, spark plasma sintering, fine-grained, dielectric properties

CLC Number:

TQ174.1

LI Lei, LI Yuelei, LIU Bangxian. Dielectric properties of fine-grained 0.8PMN-0.2PT ceramics prepared by spark plasma sintering[J]. Inorganic Chemicals Industry, 2024, 56(11): 139-144.

Figures/Tables 6

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Dielectric properties of fine-grained 0.8PMN-0.2PT ceramics prepared by spark plasma sintering

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