کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7994284 | 1516157 | 2018 | 40 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, dielectric, electromechanical, piezoelectric, elastic and ferroelectric properties of lanthanum and sodium co-substituted barium titanate ceramics
ترجمه فارسی عنوان
ساختار، دی الکتریک، الکترومکانیکی، پیزوالکتریک، الاستیک و خواص فیزیکی لانتانیم و سدیم با هم تداخل سرامیک تیتانات باریم
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کلمات کلیدی
همبستگی، اندازه دانه، الکترومکانیکی، پیزوالکتریک، کشسان، انتقال فاز پرتو، فلوئور،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
چکیده انگلیسی
In this paper, the polycrystalline ceramics Ba(1-x) (La, Na)xTiO30â¤xâ¤0.08 were synthesized by microwave assisted heating of the starting materials. Room temperature X-ray diffraction along with Rietveld refinement analysis confirmed the formation of single-phase polycrystalline compound with the tetragonal crystal structure. A dense microstructure with several grains having different size distribution throughout the sintered pellet has been observed. The incorporation of La3+ and Na+ ions in BaTiO3 enhanced the room temperature relative permittivity. The studies of the temperature dependence of dielectric permittivity indicate ferroelectric-paraelectric phase transition with a clear shift in the Curie temperature (Tc) of BaTiO3 towards lower temperature side on co-substitution. The co-substituted sample with xâ¯=â¯0.08 exhibited superior dielectric constant (É'â¯=â¯4226) with low dielectric loss (tanδâ¯=â¯0.0113) which is highly essential for the fabrication of ceramic capacitors. Resonance and antiresonance characteristics of impedance and phase for poled Ba(1-x)(La,Na)xTiO3 samples have been investigated in the frequency range of 300 kHz-1 MHz. Based on IRE standards for piezoelectric ceramics the piezoelectric response has been discussed. The room temperature P-E loop is investigated at an applied electric field of 80â¯kV/cm at 33â¯Hz frequency using Precision Premier II.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 464-476
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 464-476
نویسندگان
Mahmoud.S. Alkathy, K.C. James Raju,