Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

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• 作者：Maalti Puri ; Shalini Bahel ; Sukhleen Bindra Narang
• 关键词：Relative permittivity ; loss tangent ; temperature coefficient of relative permittivity ; impedance ; electrical modulus ; activation energy
• 刊名：Journal of Electronic Materials
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：45
• 期：10
• 页码：5048-5057
• 全文大小：2,354 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X
• 卷排序：45

文摘

The purpose of the present study is to improve the dielectric properties of lead calcium iron niobate with Zr substitution, and to make it suitable for multilayer capacitor applications in resonant circuits. (Pb_0.45Ca_0.55)(Fe_0.5Nb_0.5)_1−yZr_yO₃ dielectric ceramics where y varies from 0.00 to 0.15 in steps of 0.03, that have been synthesized by the columbite precursor method. Dielectric and electrical properties were measured as a function of frequency (10 kHz to 1 MHz) and temperature. Two frequency dependent anomalies were observed in relative permittivity (ε_r) versus temperature (T) plots around 375 K and between 500 K and 575 K. The temperature coefficient of relative permittivity, (τ_ε) has been improved with the substitution of (Fe_0.5Nb_0.5)4+ ions by Zr4+ ions at B-sites. The single semicircle, observed in Nyquist plots at different temperatures, suggests a single relaxation process in the synthesized samples. The activation energies obtained from different dependences are found to be approximately comparable.