Improved dielectric and ferroelectric properties of Mn doped barium zirconium titanate (BZT) ceramics for energy storage applications
Improved dielectric and ferroelectric properties of Mn doped barium zirconium titanate (BZT) ceramics for energy storage applications
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DOI：
10.1016/j.jpcs.2018.01.051
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发表时间：
2018-06
影响因子：
4
通讯作者：
Kanta Maan Sangwan;N. Ahlawat;R. Kundu;S. Rani;S.Usha Rani;N. Ahlawat;S. Murugavel
中科院分区：
文献类型：
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作者：
Kanta Maan Sangwan;N. Ahlawat;R. Kundu;S. Rani;S.Usha Rani;N. Ahlawat;S. Murugavel
采用固相反应法制备了成分为BaZr0.045(MnxTi1-x)0.955O3（x = 0.00,0.01,0.02）的无铅Mn掺杂钛酸钡锆陶瓷。通过x射线衍射图的Rietveld细化证实了钙钛矿的四方结构。扫描电镜（SEM）分析表明，添加一定量的Mn加速了BZT陶瓷的晶粒生长。Mn掺杂BZT陶瓷的静态介电常数成功地扩展到高频，并且介电损耗明显降低了约70%。符合居里-韦斯定律和幂定律的实验数据证实了所研究体系的一阶跃迁和扩散行为。居里温度（Tc）从387 K到402 K的变化表明掺杂BZMT陶瓷具有持续铁电的趋势。在纯BZT中，随着Mn含量的增加，各组分的电容百分比温度系数TCC在tc10附近均有较高的值，且随Mn含量的增加而增大。在室温下，x = 0.01组成的BZT改性陶瓷具有较好的残余极化（Pr= 5.718 μC/cm2）、饱和极化（Ps= 14.410 μC/cm2）、低矫顽力场（Ec= 0.612 kV/cm）和最高Pr/Ps= 0.396。
Lead free Mn doped barium zirconium titanate ceramic of composition BaZr0.045(MnxTi1-x)0.955O3(x = 0.00, 0.01, 0.02) were prepared by solid state reaction method. Tetragonal perovskite structure was confirmed by Rietveld refinement of X-ray diffraction pattern. Analysis of Scanning electron microscope (SEM) micrographs revealed that addition of Mn up to a certain limit accelerates grain growth of BZT ceramic. Static dielectric constant was successfully extended up to high frequencies with an appreciable decrease in dielectric loss about 70% for Mn doped BZT ceramics. The experimental data fitted with Curie Weiss Law and Power Law confirmed first order transition and diffusive behavior of the investigated system. The shifting of Curie temperature (Tc) from 387 K to 402 K indicated tendency for sustained ferroelectricity in doped BZMT ceramics. High value of percentage temperature coefficient of capacitance TCC >10% near Tcwas observed for all the compositions and increases with Mn content in pure BZT. At room temperature, BZT modified ceramic corresponding to x = 0.01 composition shows better values of remnant polarization (Pr= 5.718 μC/cm2), saturation polarization (Ps= 14.410 μC/cm2), low coercive field (Ec= 0.612 kV/cm), and highest value of Pr/Ps= 0.396.