Synthesis of (Bi0.5Na0.5)TiO3 (BNT) and Pr doped BNT using the soft combustion technique and its properties
Synthesis of (Bi0.5Na0.5)TiO3 (BNT) and Pr doped BNT using the soft combustion technique and its properties
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DOI：
10.1016/j.jallcom.2010.11.163
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发表时间：
2011-02
影响因子：
6.2
通讯作者：
K. A. Razak;Chiah Jun Yip;S. Sreekantan
中科院分区：
文献类型：
--
作者：
K. A. Razak;Chiah Jun Yip;S. Sreekantan
本文采用软燃烧技术成功制备了钛酸铋钠（Bi_（0.5）Na_（0.5））TiO_3（BNT）和掺镨（Pr）的BNT。研究了Pr掺杂对薄膜的化学计量比、微观结构、密度和介电性能的影响。在800°C煅烧3 h后，Pr掺杂量为5、10和20mol%的BNT均得到了纯的Pr掺杂BNT。然后将所产生的粉末压制成丸粒并在1100°C下烧结3小时。Pr ~（3+）与Bi ~（3+）和Na ~+的离子半径非常相似，这使得Bi和Na的取代成为可能。晶粒尺寸和晶粒尺寸随着Pr量的增加而减小，因为Pr作为晶粒生长抑制剂，对于煅烧粉末和烧结球团。在5mol%的Pr掺杂BNT中获得最大密度，超过该密度降低。在5mol% Pr掺杂的BNT中获得了最大的介电常数756，并且在较高的Pr掺杂水平下降低。Pr掺杂到BNT中也引起介电损耗的降低。
In this work, bismuth sodium titanate (Bi0.5Na0.5)TiO3(BNT) and praseodymium (Pr)-doped BNT were successfully produced using the soft combustion technique. The effects of Pr doping on stoichiometry, microstructure, density and dielectric properties were studied. Pure Pr-doped BNT was obtained in all samples containing 5, 10 and 20mol% Pr after calcination at 800°C for 3h. The produced powders were then pressed into pellets and sintered at 1100°C for 3h. The very similar ionic radii of Pr3+with Bi3+and Na+made it possible to substitute both Bi and Na. The crystallite size and grain size decreased with increasing Pr amount because Pr acted as grain growth inhibitor, both for calcined powders and for sintered pellets. Maximum density was obtained in 5mol% Pr-doped BNT, beyond which density decreased. The maximum dielectric constant of 756 was obtained in 5mol% Pr-doped BNT and decreased at higher levels of Pr doping. Pr doped into BNT also caused a decrease in dielectric loss.