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| Mechanical Properties and Depoling of Porous Poled PZT95/5 Ferroelectric Ceramics under Uniaxial Compression |
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Abstract Four kinds of poled lead zirconate titanate (PZT95/5) ferroelectric ceramics were fabricated with a range of different porosity levels by systematic additions of added pore formers. The mechanical behavior, domian switching, phase transformation and depoling behavior of porous poled PZT95/5 ferroelectric ceramics were investigated as a function of porosity. The unlinear deformation mechanism of porous poled PZT95/5 ferroelectric ceramics is attributed to the domian switching and phase transformation processes and not related to the deformation and collapse of voids. The depolarization mechanism of porous poled PZT95/5 ferroelectric ceramics is caused by both domian-reorientation and phase transformation. The elastic modulus and fracture strength the porous poled PZT95/5 ferroelectric ceramics are decreased with the porosities, but the fracture strain is independent on the porosities.Critical stresses of the domian switching and phase transformation and the peak of polarization released of poled PZT95/5 ferroelectric ceramics linearly decrease with increasing porosities, but the critical volumetric strain needed for phase transformation and the rate of polarization released are independent on the porosities.
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Received: 31 December 2014
Published: 24 February 2016
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2016, Vol. 37 
