کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7960861 | 1513927 | 2014 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The behaviour of 180° polarization switching in BaTiO3 from first principles calculations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
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چکیده انگلیسی
In this paper, the behaviour of 180° polarization switching in tetragonal BaTiO3 single crystal was investigated by first principles density functional theory calculations to understand the atomic scale mechanisms of 180° switching in this ferroelectric material. The calculation results indicate that the switching energy barrier per unit cell for direct 180° switching (5.11 Ã 10â3 eV) is over 4.5 times higher than the barrier for two-step 90° switching (1.10 Ã 10â3 eV). Consequently, there are two critical electric fields for 180° switching in tetragonal BaTiO3 single crystal and which can be evaluated as E90°c=744V/mm for two-step 90° switching and E180°c=2445V/mm for direct 180° switching in an ideal condition, respectively. In other words, if the applied antiparallel field Eaâ¤E90°c, the switching cannot happen. If E90°câ¤Eaâ¤E180°c, the 180° switching occurs by two 90°-switching steps. If Eaâ¥E180°c, the direct 180° switching can occur. These calculation results can explain the 180° switching behaviours experimentally observed under various electric field intensities.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 82, 1 February 2014, Pages 1-4
Journal: Computational Materials Science - Volume 82, 1 February 2014, Pages 1-4
نویسندگان
Hai-You Huang, Ming Wu, Li-Jie Qiao,