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Effects of parameter modifications on phase transition properties of ferroelectric thin films

Lu Zhao-Xin

Effects of parameter modifications on phase transition properties of ferroelectric thin films

Lu Zhao-Xin
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  • Received Date:  20 December 2012
  • Accepted Date:  01 February 2013
  • Published Online:  05 June 2013

Effects of parameter modifications on phase transition properties of ferroelectric thin films

  • 1. College of Mechanical Engineering, Linyi University, Linyi 276005, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 11247208, 11205079).

Abstract: Within the framework of effective-field theory with correlations, phase transition properties of ferroelectric thin films with different symmetrical surfaces described by the spin-1/2 transverse field Ising model are studied systematically by the differential operator technique. According to the coupling equations with the layer polarization average, the analytical general equations for phase diagrams of multiple-surface ferroelectric thin films with different surface layers have been derived. Then, effects of various parameter modifications on the crossover values from the FPD (ferroelectric-dominant phase diagram) to the PPD (paraelectric-dominant phase diagram) and phase transition regions in the parameter space are discussed in detail. In comparison with the mean-field approximation, the results indicate that the effective-field theory with correlations maybe reduce the ferroelectricity of the ferroelectric thin films more exaggeratedly than the mean-field approximation to some extent.

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