National Institute of Materials Physics, Bucharest-Magurele, Romania.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Sep;56(9):1792-8. doi: 10.1109/TUFFC.2009.1251.
Lead titanate (PT) ceramics co-doped with 8 to 13 mol% Ni-Nb, by substituting titanium ions, were prepared by conventional ceramic method and the influence of Ni-Nb doping level on their morpho-structural, electromechanical and dielectric properties was investigated. Dense tetragonal PT ceramics were obtained for 8 to 12 mol% Ni-Nb co-doping. Lattice anisotropy decreased from 1.053 to 1.046 with increasing doping level. Large thickness coupling factors of 0.4 were obtained for 8, 11, and 12 mol% Ni-Nb. Large electromechanical anisotropy of 10 was obtained for 8 mol% Ni-Nb. It was found that Ni-Nb co-doping has both softening and hardening effects as a function of donor or acceptor behavior of different amounts of Ni-Nb. For 13 mol% Ni-Nb, segregation of a small amount of a secondary phase occurs, lattice constants and tetragonality significantly decrease and the resulting ceramic becomes very hard.
掺镍-铌 8-13 摩尔%的钛酸铅（PT）陶瓷通过取代钛离子，采用传统陶瓷法制备，并研究了镍-铌掺杂水平对其形态结构、机电和介电性能的影响。8-12 摩尔%的镍-铌共掺杂可得到致密的四方相 PT 陶瓷。随着掺杂水平的增加，晶格各向异性从 1.053 降低至 1.046。8、11 和 12 摩尔%的镍-铌共掺杂可获得 0.4 的大厚度耦合系数。8 摩尔%的镍-铌共掺杂可获得 10 的大机电各向异性。结果表明，镍-铌共掺杂具有软化和硬化效应，这取决于不同量的镍-铌的施主或受主行为。对于 13 摩尔%的镍-铌，会发生少量的第二相偏析，晶格常数和四方性显著降低，所得陶瓷变得非常硬。
