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PMN–PT Ceramics Prepared By Spark Plasma Sintering

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(1−x)Pb(Mg1/2Nb2/3)O3xPbTiO3 (PMN–PT) ceramics of stoichiometric composition were fabricated by conventional pressureless sintering (CS) and spark plasma sintering (SPS). The CS ceramics exhibited a change from relaxor to normal ferroelectric behavior (FE) with increasing PT content. However, low dielectric constants, frequency dispersion, and diffuse phase transition behavior typical for relaxors were obtained for all SPS ceramics. FE and piezoelectric measurements further demonstrated low remanent polarization and strain, high coercive field, and low electromechanical response from SPS materials. Normal dielectric and enhanced FE performance appeared following high-temperature heat treatment after SPS. The effects of grain size, microstructure, and chemical heterogeneity formed during fast sintering are considered.
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Document Type: Research Article

Affiliations: Institute of Materials Science, Darmstadt University of Technology, Petersenstr. 23, Darmstadt, Germany

Publication date: April 1, 2007

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