Enhanced energy storage properties of La-doped Pb_(0.99)Nb_(0.0.2)(Zr_(0.85)Sn_(0.13)Ti_(0.02))_(0.98)O_3 antiferroelectric ceramics

摘要

Pb_(0.99)Nb_(0.0.2)(Zr_(0.85)Sn_(0.13)Ti_(0.02))_(0.98)O_3-x mol% La (PNZST-xLa, x = 0, 0.005, 0.01, and 0.02) antiferroelectric ceramics with orthorhombic perovskite structure were synthesized by solid-state reaction methods and the effect of La content on the phase stability and energy storage properties of PNZST-xLa was investigated. The introduction of La can enhance the stability of antiferroelectric phase and broaden the dielectric peak. Moreover, La doping leads to an increase of grain boundary resistance. La-doped PNZST ceramics show larger recoverable energy density and higher energy efficiency than un-doped PNZST ceramic due to the increased switching electric field and polarization as the La doping. Meanwhile, the temperature- and electric field-dependent energy storage properties were studied. The energy storage density increases with increasing electric field but declines with increasing temperature.