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Nanograined Ferroelectric Ceramics Prepared by High‐Pressure Densification Technique
Author(s) -
Mesquita Alexandre,
Bernardi Maria Inês B.,
Mastelaro Valmor R.,
Lente Manuel H.,
Eiras José A.,
Gallas Marcia R.,
Costa Tania. M. H.
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03083.x
Subject(s) - materials science , ferroelectricity , dielectric , ceramic , piezoelectricity , sintering , grain size , hysteresis , polarization (electrochemistry) , thermal diffusivity , ferroelectric ceramics , mineralogy , composite material , optoelectronics , condensed matter physics , thermodynamics , chemistry , physics
For the first time, nanograined Pb 1−1.5 x La x TiO 3 ferroelectric ceramics, with x =0.2, were produced by a process based on a high‐pressure densification technique (HPD) that eliminates the need of high‐temperature sintering. Our results showed the production of workable dense ceramics with average grain size around 100 nm and free from secondary phase. Regarding the dielectric measurements, the samples showed satisfactory dielectric losses as well as remarkable diffusivity in the dielectric curves. Moreover, ferroelectric hysteresis measurements showed that samples produced by the HPD technique can stand high electric fields necessary to switch the polarization and thus to induce piezoelectric activity. Our results demonstrated clearly the viability of the proposed method to produce nanograined ferroelectric bulk ceramics, then opening the possibility of developing new technologies.