کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1612852 1516312 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sintering characteristics and electrical properties of BaBi4Ti4O15 ferroelectric ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Sintering characteristics and electrical properties of BaBi4Ti4O15 ferroelectric ceramics
چکیده انگلیسی
Barium bismuth titanate (BaBi4Ti4O15) ceramics prepared by conventional solid-state reaction method have been characterized, and influence of sintering temperature is shown to greatly affect the electrical properties. Formation of a single phase composition with orthorhombic structure and a randomly oriented plate-like microstructure is confirmed. Raman spectroscopy reveals broad over-damped low frequency modes indicating structural disorder. Room temperature dielectric response in the low frequency range (10−2-10 Hz) reveals the influence of dc conductivity on dielectric dispersion. Analysis in terms of Lorentz type relation describes well the diffuseness in the dielectric data, and indicates only one polarization process in the system. The well fitting of frequency dependent maximum temperature (Tm) in ε′(T) to the non-linear Vogel-Fulcher equation and a similar trend in temperature dependent ac conductivity imply a relaxor-like nature of the material. Sintering at 1050 °C for 5 h is found to be favorable and yields ceramics with high density, high resistivity (4.6 × 1012 Ω cm), low dielectric loss (tan δ ∼ 0.05), remnant polarization (Pr = 3.63 μC/cm2) and a high piezoelectric charge coefficient, d33 = 24 pC/N.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 581, 25 December 2013, Pages 150-159
نویسندگان
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