Electrical and Ferroelectric Properties of Strontium Doped Lead-Free BCZT Ceramics

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

ECS Journal of Solid State Science and Technology Pub Date : 2024-06-17 DOI:10.1149/2162-8777/ad5589

Ritesh Verma, Muskan Saini, Ankush Chauhan, Rohit Jasrotia, Rahul Kalia, Leena Bhardwaj and Atul Thakur

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Abstract

Herein, we synthesized Ba0.9-xCa0.1SrxTi0.8Zr0.2O3(x = 0.05, 0.1, 0.15, 0.2) ceramic samples by employing a solid-state reaction technique. The variation of dielectric constant is studied concerning temperature in the range 1 kHz to 1 MHz frequency. Variation of dielectric constant ( ) with temperature reveals that charge carrier dispersion pushes the transition temperature towards higher frequency. Impedance analysis reveals that the maximum value of the imaginary part of impedance i.e., maxima, increases in all samples except for x = 0.05, which shows the opposite behaviour. This behaviour is due to the calcium (Ca2+) substitution at the titanium (Ti4+)-site at low doping concentration of Sr2+ ions. Nyquist plots show the presence of a single semi-circular arc, indicating the contribution of resistance and capacitance through grain boundary. PE hysteresis loops reveal that the values of saturation polarization ( ) decrease with increasing Sr-doping, from 10.989 μC cm−2 to 6.586 μC cm−2, whereas the remnant polarization ( ) shows variable values with increasing Sr-doping.

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掺锶无铅 BCZT 陶瓷的电学和铁电特性

在此，我们采用固态反应技术合成了 Ba0.9-xCa0.1SrxTi0.8Zr0.2O3（x = 0.05、0.1、0.15、0.2）陶瓷样品。在 1 kHz 至 1 MHz 频率范围内，研究了介电常数随温度的变化。介电常数（）随温度的变化表明，电荷载流子的分散将过渡温度推向更高的频率。阻抗分析表明，除了 x = 0.05 样品的阻抗虚部最大值（即最大值）与 x = 0.05 样品的情况相反外，其他所有样品的阻抗虚部最大值都在增加。这种行为是由于在 Sr2+ 离子掺杂浓度较低时，钙（Ca2+）取代了钛（Ti4+）位点。奈奎斯特图显示存在单个半圆弧，表明电阻和电容通过晶界产生。PE 磁滞环显示，饱和极化值（）随着 Sr 掺杂量的增加而降低，从 10.989 μC cm-2 降至 6.586 μC cm-2，而残余极化值（）则随着 Sr 掺杂量的增加而变化。

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来源期刊

ECS Journal of Solid State Science and Technology MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED

CiteScore

4.50

自引率

13.60%

发文量

455

期刊介绍： The ECS Journal of Solid State Science and Technology (JSS) was launched in 2012, and publishes outstanding research covering fundamental and applied areas of solid state science and technology, including experimental and theoretical aspects of the chemistry and physics of materials and devices. JSS has five topical interest areas: carbon nanostructures and devices dielectric science and materials electronic materials and processing electronic and photonic devices and systems luminescence and display materials, devices and processing.