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The dielectric properties of 0.75Pb(Mg1/3Nb2/3)O3-0.25PbTiO3 (PMN-25PT) ceramic under hydrostatic pressure and pressure-induced phase transition were investigated. PMN-25PT ceramic is pure perovskite with weak relaxation at 1 bar. With increasing hydrostatic pressure,the temperature,Tm,of top dielectric constant decreases,/+{dTm}/-{dP}≈-4℃/kbar,frequency dispersion and phase transition diffuse increases,remnant polarization decreased continuously. The hydrostatic pressure dependence of dielectric constant (ε) is similar to the temperature dependence of dielectric constant. The relax ferroelectric-paraelectric (RFE-PE) phase transition was induced by hydrostatic pressure and the transition was gradual change process with stronger relaxor behavior than by temperature-induced.
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Keywords:
- Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramic /
- hydrostatic pressure /
- dielectric relaxation /
- pressure-induced phase transition
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