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 syn...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.展开更多
基金supported by the National Natural Science Foundation of China(Grants Nos.52072218)the National Key Research and Development Program of China(2021YFB3601504)+1 种基金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).
文摘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.
