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 produc...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.展开更多
In this work, we present an effective way to increase the density of lanthanum-doped bismuth titanate ceramics （Bi4_xLaxTi3Oa2; BLT）. Dense BLT ceramics with formula Bi4LaxTi3012 （when x = 0.25, 0.5, 0.75, 1.0） ar...In this work, we present an effective way to increase the density of lanthanum-doped bismuth titanate ceramics （Bi4_xLaxTi3Oa2; BLT）. Dense BLT ceramics with formula Bi4LaxTi3012 （when x = 0.25, 0.5, 0.75, 1.0） are prepared by using nanocrystalline powders fabricated by the sol-gel method and high-pressure technique. The thermal decomposition and phase transformation process of the gel precursors are studied by using DTA, infrared spectroscopy （IRS） and X-ray diffraction （XRD）. The micro- structures of BLT ceramics are investigated by using transmission electron microscopy （TEM） and scanning electron microscopy （SEM）. The experimental results indicate that the phase compositions of all samples with various La substitutes at 900℃possess the layer-structure of Bi4Ti3012 （BTO）. The green pellets are pressed under 2.5, 3.0, 3.5 and 4.0 GPa, separately. It is found that the density of BLT ceramics is significantly increased due to the decreasing of porosity in the green compacts by the high-pressure process. The samples are sintered at temperatures between 900 and 1100℃and it is found that the optimum sin- tering temperature is 1100℃. Dense BLT ceramics with 90% of their theoretic density have been achieved from the sample prepared at a sintering temperature of 1100℃ for 1.5 h.展开更多
基金financial support from the Key Research and Development Project of Zhejiang Province,China(No.2017C01056)。
文摘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.
基金supported by the Open Foundation of State Key Laboratory of Superhard Materials (Grant No. 201003)the Science Development Project of Jilin Province (Grant No. 20090144)
文摘In this work, we present an effective way to increase the density of lanthanum-doped bismuth titanate ceramics （Bi4_xLaxTi3Oa2; BLT）. Dense BLT ceramics with formula Bi4LaxTi3012 （when x = 0.25, 0.5, 0.75, 1.0） are prepared by using nanocrystalline powders fabricated by the sol-gel method and high-pressure technique. The thermal decomposition and phase transformation process of the gel precursors are studied by using DTA, infrared spectroscopy （IRS） and X-ray diffraction （XRD）. The micro- structures of BLT ceramics are investigated by using transmission electron microscopy （TEM） and scanning electron microscopy （SEM）. The experimental results indicate that the phase compositions of all samples with various La substitutes at 900℃possess the layer-structure of Bi4Ti3012 （BTO）. The green pellets are pressed under 2.5, 3.0, 3.5 and 4.0 GPa, separately. It is found that the density of BLT ceramics is significantly increased due to the decreasing of porosity in the green compacts by the high-pressure process. The samples are sintered at temperatures between 900 and 1100℃and it is found that the optimum sin- tering temperature is 1100℃. Dense BLT ceramics with 90% of their theoretic density have been achieved from the sample prepared at a sintering temperature of 1100℃ for 1.5 h.
