铅基压电陶瓷因其优异的压电性能,被广泛应用于压电器件。其中,压电驱动器要求压电陶瓷具有较高压电性能并且在电场下具有较高的电致应变和较小的应变滞后。本研究通过施主-受主共掺,得到高压电性能和低电场应变滞后的PZT陶瓷。采用传...铅基压电陶瓷因其优异的压电性能,被广泛应用于压电器件。其中,压电驱动器要求压电陶瓷具有较高压电性能并且在电场下具有较高的电致应变和较小的应变滞后。本研究通过施主-受主共掺,得到高压电性能和低电场应变滞后的PZT陶瓷。采用传统固相反应法制备了(1-x)(Pb_(0.95)Sr_(0.05))(Zr_(53)Ti_(47))O_(3)-x BiAlO_(3)+0.2%MnO_(2)陶瓷(掺杂量为质量百分数),并对其微观结构和压电性能进行了研究。结果表明:BiAlO_(3)掺杂量较少时,陶瓷中缺陷偶极子的“钉扎”效应使得陶瓷畴壁转动困难,陶瓷压电性能较弱,应变滞后也较小。随BiAlO_(3)掺杂量增加,缺陷偶极子“钉扎”效应减弱,陶瓷的压电性能和应变滞后随之提高。本实验得到的性能最优组分为x=1.75%,该组份陶瓷的压电系数d_(33)=504 p C/N,机电耦合系数k_(p)=0.71,机械品质因数Q_(m)=281,居里温度T_(C)=312℃,在10k V/cm电场下的应变滞后仅为15%,并且还具有较好的温度稳定性,是一种具有应用价值的压电驱动器用压电陶瓷材料。展开更多
The collision of C_(60) with a graphite(0001)surface has been investigated by molecular dynamics simulation with TLHL potential.At an impact energy of 90eV,the C_(60) buckyball first deformed to a disc-like structure ...The collision of C_(60) with a graphite(0001)surface has been investigated by molecular dynamics simulation with TLHL potential.At an impact energy of 90eV,the C_(60) buckyball first deformed to a disc-like structure and then transformed back to its original shape and recoiled slowly.No dissociation of the C_(60) was observed on the time scale of the simulation.Unlike a single-atom-surface collision,the C_(60)-surface interaction is a highly inelastic process.展开更多
基金National Natural Science Foundation of China(51831010)National Key R&D Program(2021YFA0716502,2021YFB3800604)。
文摘铅基压电陶瓷因其优异的压电性能,被广泛应用于压电器件。其中,压电驱动器要求压电陶瓷具有较高压电性能并且在电场下具有较高的电致应变和较小的应变滞后。本研究通过施主-受主共掺,得到高压电性能和低电场应变滞后的PZT陶瓷。采用传统固相反应法制备了(1-x)(Pb_(0.95)Sr_(0.05))(Zr_(53)Ti_(47))O_(3)-x BiAlO_(3)+0.2%MnO_(2)陶瓷(掺杂量为质量百分数),并对其微观结构和压电性能进行了研究。结果表明:BiAlO_(3)掺杂量较少时,陶瓷中缺陷偶极子的“钉扎”效应使得陶瓷畴壁转动困难,陶瓷压电性能较弱,应变滞后也较小。随BiAlO_(3)掺杂量增加,缺陷偶极子“钉扎”效应减弱,陶瓷的压电性能和应变滞后随之提高。本实验得到的性能最优组分为x=1.75%,该组份陶瓷的压电系数d_(33)=504 p C/N,机电耦合系数k_(p)=0.71,机械品质因数Q_(m)=281,居里温度T_(C)=312℃,在10k V/cm电场下的应变滞后仅为15%,并且还具有较好的温度稳定性,是一种具有应用价值的压电驱动器用压电陶瓷材料。
基金Supported by the National Natural Science Foundation of China.
文摘The collision of C_(60) with a graphite(0001)surface has been investigated by molecular dynamics simulation with TLHL potential.At an impact energy of 90eV,the C_(60) buckyball first deformed to a disc-like structure and then transformed back to its original shape and recoiled slowly.No dissociation of the C_(60) was observed on the time scale of the simulation.Unlike a single-atom-surface collision,the C_(60)-surface interaction is a highly inelastic process.
