A Lead-Free High-Curie-Point Ferroelectric Ceramic, CaBi2Nb2O9


  • This research was funded by QinetiQ Ltd under contract number CU004-16541 and the Swedish Research Council through grant 621-2002-4299.


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A lead-free high-Curie-point Aurivillius-phase ferroelectric ceramic, CaBi2Nb2O9, has been fabricated by spark plasma sintering (SPS). It has a Curie point (943 °C) that is much higher than previously reported (650 °C). The piezoelectric constant d33 of the SPS textured material was nearly three times that of ordinary-fired (OF) materials and was stable up to 800 °C (see Figure). These textured ceramics are promising candidates for high- temperature piezoelectric applications.