摘要
High-temperature piezoelectric materials with excellent piezoelectricity,low dielectric loss and large resistivity are highly desired for many industrial sectors such as aerospace,aircraft and nuclear power.Here a synergistic design strategy combining microstructural texture and chemical doping is employed to optimize CaBi 4Ti 4O15(CBT)ceramics with bismuth layer structure.High textured microstructure with an orientation factor of 80%e82%has been successfully achieved by the spark plasma sintering tech-nique.Furthermore,by doping MnO_(2),both advantages of hard doping and sintering aids are used to obtain the excellent electrical performance of d_(33)=27.3 pC/N,tandδ-0.1%,Q_(31)~2,307 and electrical re-sistivityρ~6.5×10^(10)Ω·cm.Up to 600℃,the 0.2%(in mass)Mn doped CBT ceramics still exhibit high performance of d_(33)=26.4 pC/N,r~1.5×10^(6)Ω·cm and tandδ~15.8%,keeping at an applicable level,thus the upper-temperature limit for practical application of the CBT ceramics is greatly increased.This work paves a new way for developing and fabricating excellent high-temperature piezoelectric materials.
基金
supported by the National Natural Science Foundation of China(Grants Nos.52072218)
the National Key Research and Development Program of China(2021YFB3601504)
the Natural Science Foundation of Shandong Province(ZR2022YQ43 and ZR2020KE019)
the Peixin Fund of Qilu University of Technology(Shandong Academy of Sciences)(Grant No.2023PY093).
