A Comparative Research on PLMNT Relaxor Ferroelectric Ceramic Prepared by Conventional and Hot-Press Techniques

Abstract:

PLMNT3/75/25 ceramics were prepared by uniaxial hot-press sintering method and conventional sintering method, respectively. X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance analyzer were used to measure the properties of the PLMNT ceramics. PLMNT ceramic with pure perovskite phase was fabricated by uniaxial hot-press sintering method, while, a secondary pyrochlore phase was found in PLMNT ceramic prepared by conventional sintering method. It was observed that the PLMNT ceramic fabricated by uniaxial hot-press sintering showed better densification and more uniform grain size than that of the PLMNT ceramic prepared by conventional sintering. The dielectric responses showed that the samples prepared by two methods both exhibited diffuse phase transition characteristic, and the values of the diffusivity parameter were calculated according to the linear fitting of the modified Curie-Weiss law. The relaxor ferroelectric characteristics of PLMNT ceramics accorded well with the Vogel-Fulcher relationship. The P-E hysteresis loops of the samples from uniaxial hot-press sintering were apparently slight than that of conventional sintering samples, while the value of the P_s (saturation polarization) was significantly higher.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 781-785
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.781
• Online since: March 2014
• Authors: Wen Long Ji, Xi Yun He, Wen Xiu Cheng, Ping Sun Qiu, Xia Zeng, Bin Xia, Dong Wang*
• Keywords: PLMNT Ceramics, Relaxor Ferroelectric, Uniaxial Hot-Press Sintering

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