摘要
CaBi_(4)Ti_(4)O_(15)(CBT)-based Aurivillius high-temperature piezoceramics with different Sb-Mn co-doping amounts were synthesized via the conventional sintering technique.The influences of doping amount on the product were studied via their crystal structure,microstructure,and piezoelectric performance.It is found that an appropriate Sb-Mn co-doping amount can effectively optimize the crystal structure and decrease the oxygen vacancy concentration in CBT ceramics,leading to enhanced electrical properties.Optimized electrical performance with a high Curie temperature(TC)of 792℃and a remarkable piezoelectric coefficient(d33)of 25 p C/N were achieved at a doping amount(x)of 0.05.Furthermore,this ceramic is found to exhibit an excellent thermal stability,with d33 retaining 88%of its original value after annealing at 600℃for 2 h.Moreover,this ceramic shows a high electrical resistivity(ρ)of 1.35×10^(8)Ω·cm with a small dielectric loss(tanδ)of 1.7%at 400℃.Because of such outstanding piezoelectric performance,it is believed that these Sb-Mn co-doped CBT ceramics could be potential candidates for high-temperature piezoelectric applications.
采用常规烧结方法合成不同Sb-Mn共掺杂量的CaBi_(4)Ti_(4)O_(15)(CBT)基Aurivillius高温压电陶瓷。从晶体结构、显微组织和压电性能等方面研究掺杂量(x)对陶瓷性能的影响。研究发现,适当的Sb-Mn掺杂量可以有效地优化CBT陶瓷的晶格结构,降低氧空位浓度,从而提高其电学性能。在x=0.05组分时获得优化的电性能,792℃的高居里温度、25 p C/N的压电系数(d33)。另外,这种陶瓷表现出良好的热稳定性,在600℃退火2 h后d33仍保持初始值的88%。此外,在400℃时陶瓷还显示出高电阻率(ρ=1.35×10^(8)Ω·cm)和小的介电损耗(tanδ=1.7%)。由于这些优异的压电性能,Sb-Mn共掺杂的CBT陶瓷有可能成为高温压电应用的潜在候选材料。
基金
financial support from the Key Research and Development Project of Zhejiang Province,China(No.2017C01056)。
