کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10653343 | 1002869 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Relaxor behavior of (Ba,Sr)(Zr,Ti)O3 ferroelectric ceramics
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We examine the ferroelectric-relaxor behavior of (Ba0.65Sr0.35)(Zr0.35Ti0.65)O3 (BSZT) ceramics in the temperature range from 80 to 380 K. A broad dielectric maximum, which shifts to higher temperature with increasing frequency, signifies the relaxor-type behavior of these ceramics. The value of the relaxation parameter γâ¼2 estimated from the linear fit of the modified Curie-Weiss law, indicates the relaxor nature of the BSZT ceramics. The dielectric relaxation rate follows the Vogel-Fulcher relation with TVF=107 K, Ea=0.121 eV, and ν0=6.83Ã1014 Hz, further supports such relaxor nature. The slim P-E hysteresis loop and 'butterfly' shape dc bias field dependence of permittivity at T>Tm (Tm, the temperature of permittivity maximum) clearly signifies the occurrence of nanopolar clusters, which is the typical characteristic of ferroelectric relaxor. At 300 K and 10 kHz, the dielectric constant and loss tan δ are â¼1100 and 0.0015, respectively. The high tunability (â¼25%) and figure of merit (â¼130) at room temperature show that the BSZT ceramics could be a promising candidate for tunable capacitor applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 136, Issue 2, October 2005, Pages 89-93
Journal: Solid State Communications - Volume 136, Issue 2, October 2005, Pages 89-93
نویسندگان
X.G. Tang, X.X. Wang, K.-H. Chew, H.L.W. Chan,