Authors: Yuji Hiruma Kota Marumo Rintaro Aoyagi Hajime Nagata Tadashi Takenaka
Publish Date: 2007/06/01
Volume: 21, Issue: 1-4, Pages: 296-299
Abstract
Bismuth potassium titanate Bi1/2K1/2TiO3 BKT ceramics were prepared by the hotpressing HP method without dopant and with dopants of Bi2O3 La2O3 and MnCO3 The relative density of BKT ceramics hotpressed at 1060 and 1080 °C hereafter abbreviated to BKTHP1060°C and BKTHP1080°C and x mass Bi2O3 La2O3 and MnCO3 doped BKT ceramics hotpressed at 1060 °C hereafter abbreviated as BKTBix x = 01–06 BKTLax x = 01–06 and BKTMnx x = 01–03 were all higher than 97 In this study the ferroelectric properties of BKT ceramics were successfully obtained and the remanent polarization P r and coercive field E c of BKTHP1080°C were 222 μC/cm2 and 525 kV/cm respectively A small amount of La tends to increase P r and the P r of BKTLa01 was 192 μC/cm2 The piezoelectricities were improved to optimize poling conditions and the electromechanical coupling factor k 33 and piezoelectric constant d 33 of BKTHP1080°C were 034 and 828 pC/N respectivelyThe authors would like to thank Toho Titanium Co Ltd for providing titanium oxide powder with high purity This work was partially supported by a GrantinAid for Scientific Research B No 17360327 from the Japan Society for the Promotion of Science
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