Effects of synthesized method on glassy behavior and freezing process of 0.75PFW-0.25PT ceramics

Cheng Shong Hong, Sheng Yuan Chu, Cheng Che Tsai, Wen Chang Su, Chi Cheng Hsu

研究成果: Article

1 引文 斯高帕斯(Scopus)

摘要

Two different methods, the conventional direct oxide synthesized method and the two-step indirect synthesized (IS) method, were employed to synthesize the 0.75Pb (Fe2/3W1/3)O3-0.25 PbTiO3 ceramics. The low-field dielectric responses were investigated using the empirical law and the Curie-Weiss law. The temperature-dependent local ordering parameters were derived from the experimental results using the spin-glass model and the modified-Landau theory separately. According to the experimental data and the fitting results, it is concluded that the temperature-dependent local order parameters are changed from a short-range-ordered relaxor to a long-range-ordered ferroelectric state using the IS method. On the basis of the physical concepts of the spin-glass model, the modified-Landau theory and the ordering models, it is suggested that local polarizations are affected not only by degree of ordering but also by space charge polarization. In contrast, the glassy behavior of local polarization is affected only by degree of ordering but has nothing to do with space charge polarization. It is because local fields induced by space charge polarization have the same effect on local polarizations and are neutralized when calculating the correlation between neighboring polar microregions. On the other hand, the freezing process of local polarizations is affected by both degree of ordering and space charge polarization because local polarization affected by local fields cannot be neutralized when calculating the individual behavior of local polarization.

原文English
文章編號034106
期刊Journal of Applied Physics
109
發行號3
DOIs
出版狀態Published - 2011 二月 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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