Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Phase Transformation and Dielectric Properties of <001> 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 Single Crystals

<001> 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 단결정의 상변화 및 유전 특성

  • Lee, Eun-Gu (Department of Advanced Materials Engineering, Chosun University) ;
  • Lee, Jae-Gab (School of Advanced Materials Engineering, Kookmin University)
  • Received : 2011.05.11
  • Accepted : 2011.06.15
  • Published : 2011.07.27
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Abstract

The structure and dielectric properties of poled <001>-oriented 0.7Pb($Mg_{1/3}Nb_{2/3})O_3-0.3PbTiO_3$ (PMN-0.3PT) crystals have been investigated for orientations both parallel and perpendicular to the [001] poling direction. An electric field induced monoclinic phase was observed for the initial poled sample. The phase remained stable after the field was removed. A quite different temperature dependence of dielectric constant has been observed between heating and cooling due to an irreversible phase transformation. The results of mesh scans and temperature dependence of the dielectric constant demonstrate that the initial monoclinic phase changes to a single domain tetragonal phase at 370K and to a paraelectric cubic phase at 405K upon heating. However, upon subsequent cooling from the unpoled state, the cubic phase changes to a poly domain tetragonal phase and to a rhombohedral phase. In the ferroelectric tetragonal phase with a single domain state, the dielectric constant measured perpendicular to the poling direction was dramatically higher than that of the parallel direction. A large dielectric constant implies easier polarization rotation away from the polar axis. This enhancement is believed to be related to dielectric softening close to the morphotropic phase boundary and at the phase transition temperature.

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References

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