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首页> 外文期刊>Journal of advanced dielectrics >DIELECTRIC RESPONSE AND IMPEDANCE SPECTROSCOPY OF (Na_(0.5)Bi_(0.5))_(0.95)Ba_(0.05)Zr_(0.04)Ti_(0.96)O_3 FERROELECTRIC CERAMIC
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DIELECTRIC RESPONSE AND IMPEDANCE SPECTROSCOPY OF (Na_(0.5)Bi_(0.5))_(0.95)Ba_(0.05)Zr_(0.04)Ti_(0.96)O_3 FERROELECTRIC CERAMIC

机译：（Na_（0.5）Bi_（0.5））_（0.95）Ba_（0.05）Zr_（0.04）Ti_（0.96）O_3铁电陶瓷的介电响应和阻抗谱

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摘要

A new lead-free ferroelectric relaxor ceramic was prepared by conventional solid-state synthesis by modifying A-site and B-site in (Na_(0.5)Bi_(0.5))TiO_3 system, i.e., (Na_(0.5)Bi_(0.5))_(0.95)Ba_(0.05)Zr_(0.04)Ti_(0.96)O_3 (0.05BNBZT). X-ray diffraction studies reveal a single phase rhombohedral structure. Crystallite size and strain analysis has been done by Debye-Scherrer and Williamson-Hall technique. The tolerance factor is 0.81, indicating a stable Perovskite structure of the material. Scanning electron micrograph of the material shows a distribution of grains, average grain size is 1.41 μm. Dielectric response of (Na_(0.5)Bi_(0.5))_(0.95)Ba_(0.05)Zr_(0.04)Ti_(0.96)O_3, ferroelectric ceramic has been studied as a function of frequency over a wide range of temperatures. The studied ceramic exhibited maximum frequency dispersion in both real and imaginary part of dielectric susceptibility at and around the dielectric transition temperature (T_m). The frequency dependence of transition temperature, T_m (temperature of the maximum of dielectric constant) was studied in terms of Vogel-Fulcher relation. The dielectric relaxation of(Na_(0.5)Bi_(0.5))_(0.95)Ba_(0.05)Zr_(0.04)Ti_(0.96)O_3 ceramic was studied at different temperatures using the complex impedance (Z*) and electrical modulus (M*) formalism. Impedance measurements were made on over a wide range of temperatures (300-600℃) and frequencies (45 Hz-5 MHz) which show the presence of both grain and grain boundary effects in the material. The Impedance spectroscopy is shown to be an efficient method capable of detecting the contributions of the resistances of grain boundaries (at higher temperature), in addition to granular contribution (at all temperatures), which influences the device properties of a material. The electric modulus (M~*) formalism used in the analysis enabled us to distinguish and separate the relaxation processes. Conductivity studies in the material obey the Jonscher's power law in frequency (45 Hz-5 MHz) and temperature (30-600℃). These results give evidence that the lead-free ferroelectric ceramics is extensively may be used for device and electronic applications, when compared with lead-based materials.
机译：通过改变（Na_（0.5）Bi_（0.5））TiO_3体系即（Na_（0.5）Bi_（0.5）的A位和B位，通过常规固相合成制备了新型无铅铁电弛豫陶瓷。 ）_（0.95）Ba_（0.05）Zr_（0.04）Ti_（0.96）O_3（0.05BNBZT）。 X射线衍射研究揭示了单相菱面体结构。微晶尺寸和应变分析已通过Debye-Scherrer和Williamson-Hall技术完成。公差系数为0.81，表明该材料具有稳定的钙钛矿结构。该材料的扫描电子显微镜照片显示晶粒的分布，平均晶粒尺寸为1.41μm。研究了（Na_（0.5）Bi_（0.5））_（0.95）Ba_（0.05）Zr_（0.04）Ti_（0.96）O_3的介电响应，该铁电陶瓷是在较宽的温度范围内随频率变化的函数。所研究的陶瓷在介电转变温度（T_m）及其附近的介电常数的实部和虚部均表现出最大的频率色散。根据Vogel-Fulcher关系研究了转变温度T_m（最大介电常数的温度）的频率依赖性。利用复阻抗（Z *）和电模量（M）研究了（Na_（0.5）Bi_（0.5））_（0.95）Ba_（0.05）Zr_（0.04）Ti_（0.96）O_3陶瓷在不同温度下的介电弛豫*）形式主义。在很宽的温度范围（300-600℃）和频率范围（45 Hz-5 MHz）上进行了阻抗测量，表明材料中同时存在晶粒和晶界效应。阻抗谱显示是一种有效的方法，除了可以影响材料的器件性能的颗粒作用（在所有温度下）外，它还可以检测晶界电阻（在较高温度下）的作用。分析中使用的电子模量（M〜*）形式使我们能够区分和分离松弛过程。材料的电导率研究在频率（45 Hz-5 MHz）和温度（30-600℃）时遵循Jonscher的功率定律。这些结果表明，与铅基材料相比，无铅铁电陶瓷可广泛用于设备和电子应用。

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