Results (
Thai) 1:
[Copy]Copied!
Bismuth sodium titanate (BNT) discovered by Smolensky et al. in1960 [11] is one of several attractive lead-free perovskite structurematerials with high mechanical bending strength [11]. BNT also hasinteresting electrical properties such as good dielectric constant(3r w 406) and acceptable piezoelectric coefficient (d33 w 94 pC/N)[9]. BNT possesses strong ferroelectric properties at a relativelyhigh Curie temperature (Tc ¼ 320 C) with large remanent polarization(Pr ¼ 38 mC/cm2) and coercive field (Ec ¼ 73 kV/cm) at roomtemperature [9,12e14]. Furthermore, it also allows free control ofsintering atmosphere and no lead pollution during fabricationprocess [15].With their complementary features, the solid solutions betweenPZT and BNT (PZT/BNT system) are expected to exhibit betterproperties than those of single phase PZT and BNT. Furthermore,the properties can also be tailored over a wide range by changingthe compositions to meet the strict requirements for specificapplications. The study of PZT-based solid solutions with BNT wasfirstly reported by Kitagawa et al. [16], whose results showed thatmechanical strength and piezoelectric properties of BNT-added PZTceramics were improved over those of pure PZT. Since dielectricand ferroelectric properties of PZT/BNT ceramics have not beenstudied, the effects of BNT compound on structure and electricalproperties such as dielectric, ferroelectric and piezoelectric of PZTceramic were therefore investigated in this work.
Being translated, please wait..