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Ferroelectric Properties of Polycrystalline Ceramics with Dipolar Defect Simulated from the Potts--Ising Model |
| ZHANG Yan-Fei;WANG Chun-Lei;ZHAO Ming-Lei;LI Ji-Chao;ZHANG Rui-Zhi;LIU Jian;MEI Liang-Mo |
| School of Physics and Microelectronics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 |
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| Cite this article: |
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ZHANG Yan-Fei, WANG Chun-Lei, ZHAO Ming-Lei et al 2008 Chin. Phys. Lett. 25 1442-1445 |
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Abstract Physical properties of polycrystalline ferroelectrics including the contributions of the fixed dipolar defects and the average grain size in the Potts--Ising model are simulated by using the Monte Carlo method. Domain pattern,
hysteresis loop and switching current of the polarization reversal process are obtained. Two processes are considered in our simulation. In the first one, the grain texture of ferroelectric ceramics are produced from the Potts model, and then the Ising model is implemented in the obtained polycrystalline texture to produce the domain pattern, hysteresis loop and switching current. It is concluded that the defect has the ability to decrease the remnant
polarization Pr as well as the coercive field Ec. The back switching is obviously observed after the electric field is off, and it shows some variation after introducing the fixed dipolar defect. Meanwhile, the spike of the switching current is found to lower with the increasing defect concentration and the decreasing average grain size.
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77.80.-e
61.72.Bb
05.50.+q
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Received: 10 November 2007
Published: 31 March 2008
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| PACS: |
77.80.-e
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(Ferroelectricity and antiferroelectricity)
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61.72.Bb
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(Theories and models of crystal defects)
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05.50.+q
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(Lattice theory and statistics)
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