Munir Muhammad, Hussain Ali, Ock Ji-Young, Son Jeong-Hun, Khan Salman Ali, Bae Dong-Sik
School of Advanced Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea.
Department of Materials Science and Engineering, Institute of Space Technology, Islamabad 44000, Pakistan.
J Nanosci Nanotechnol. 2019 Mar 1;19(3):1323-1329. doi: 10.1166/jnn.2019.16170.
In this work, bismuth sodium titanate, Bi±Na±TiO₃ (BNT, , = -0.05-0.08) nanopowders were produced using the low-temperature sol-gel technique. The effects of deficient and excess amounts of Bi and Na on BNT structure were systemically examined through X-ray powder diffraction (XRD), energy dispersive analysis (EDS) and scanning electron microscope (SEM). The optimized composition of the BNT nanopowder was pelletized and sintered at different temperatures (950°C-1150 °C). Highly dense ceramics possessing pure perovskite phase was observed for the sample sintered at an optimum sintering temperature (1100 °C). The ferroelectric properties were found to increase with an increase in sintering temperature up to 1100 °C and then decrease. This study justifies that Bi and Na non-stoichiometry (proper excess), processing and sintering temperatures play important role in the successful synthesis of BNT ceramics.
在本工作中，采用低温溶胶-凝胶技术制备了钛酸铋钠（Bi±Na±TiO₃，BNT， = -0.05 - 0.08）纳米粉末。通过X射线粉末衍射（XRD）、能谱分析（EDS）和扫描电子显微镜（SEM）系统地研究了Bi和Na含量不足与过量对BNT结构的影响。将优化后的BNT纳米粉末组成制成颗粒，并在不同温度（950°C - 1150°C）下烧结。在最佳烧结温度（1100°C）下烧结的样品观察到具有纯钙钛矿相的高密度陶瓷。发现铁电性能随着烧结温度升高至1100°C而增加，然后下降。本研究表明，Bi和Na的非化学计量比（适当过量）、加工和烧结温度在BNT陶瓷的成功合成中起着重要作用。
