Dielectric and energy storage properties of Pb(Mg1/3Nb2/3)O3-PbTiO3 thick film ceramics under high electric field

Abstract: In this paper,(1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3(PMN-PT) ( x=0.05, 0.06, 0.07) relaxor ferroelectric ceramic powders were synthesized via the well-known two-step method(columbite method). Then, the thick film ceramics with the thickness of about 40 μm were fabricated using a tape - casting process and series of sintering approaches afterwards. The polycrystalline structures and morphologies of PMN - PT ceramics were characterized using the X - ray diffraction ( XRD) and scanning electron microscopy(SEM) techniques. The dielectric and ferroelectric properties of PMN-PT ceramics were characterized using the impedance analyzer and ferroelectric polarization-electric field hysteresis loop measuring equipment, respectively. Based on the hysteresis loop, the charge and discharge energy storage densities and corresponding energy storage efficiencies of the ceramic samples were calculated. The procured ceramics manifest typical relaxor ferroelectric characteristics and excellent dielectric properties near room temperature. The energy storage densities of the samples with PT content of x=0.05, x=0.06, x=0.07 are 0.87J/cm³, 0.94J/cm³, 0.88J/cm³and the energy storage efficiencies of them are 72.28%, 81.44%, 81.54% at 15 MV/m, respectively.

Key words: PMN-PT; thick film ceramics; dielectric properties; energy storage density; energy storage efficiency

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