کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1532106 | 1512022 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structure and ferroelectric properties of mixed bismuth layer-structured Bi7Ti4+x/2Nb1âxWx/2O21 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of Ti and W substitutions for Nb on the ferroelectric properties and the crystal structure of Bi7Ti4+x/2Nb1âxWx/2O21 ceramics were investigated in this study. From the XRPD patterns, no impurity phase was observed in the composition range from 0 to 1. The solid solutions have orthorhombic symmetry, with I2cm space group. The curve representing the relationship between composition x and remanent polarization (Pr) passes through a maximum at approximately x = 0.75; therefore, the maximum Pr value of 12.4 μC/cm2 was obtained for this composition. The variation in the structural distortion of oxygen octahedra in the pseudo-perovskite block showed the same tendency as that of the Pr values. On the other hand, the coercive field (Ec) of the samples at the composition range from 0 to 1 remained the approximately constant value of 90 kV/cm. Moreover, the Curie temperature (Tc) of the samples was decreased from 840 to 715 °C by the increase of the structural distortion of the pseudo-perovskite block, which was caused by the Ti and W substitutions for Nb.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 129, Issues 1â3, 15 April 2006, Pages 80-85
Journal: Materials Science and Engineering: B - Volume 129, Issues 1â3, 15 April 2006, Pages 80-85
نویسندگان
Atsushi Yokoi, Hirotaka Ogawa,