Modification of grain boundary structure of SrTiO3 using hydroxyl additives
Modification of grain boundary structure of SrTiO3 using hydroxyl additives
复制标题
使用羟基添加剂对 SrTiO3 晶界结构进行改性
DOI：
10.1016/j.ceramint.2017.11.188
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发表时间：
2018
影响因子：
5.2
通讯作者：
Shao-Ju Shih and Toshihiro Moriga
中科院分区：
文献类型：
--
作者：
Tzu-Yi Li;Katsuya Nakata;Shao-Ju Shih and Toshihiro Moriga
钛酸锶（SrTiO 3）是一种典型的钙钛矿材料，由于其重要的性能，如良好的介电常数和良好的导电性。早期的研究报道羟基（OH）基团可以通过改变表面能来操纵SrTiO 3表面的形状和控制晶体的生长。该概念可用于增加（111）表面的数量以形成更多的具有较低能量的高离子电导率的α 3晶界。本研究以甘油和1，2-丙二醇两种常用的羟基添加剂为原料，制备了钛酸锶粉体。采用喷雾热分解法制备SrTiO 3粉体，并对其进行烧结，得到多晶SrTiO 3。结果表明，添加剂处理后的SrTiO 3粉体具有更高的（111）晶面数和更高的电导率。此外，1，2-丙二醇处理的SrTiO 3产生最多的γ 3晶界（11.0 ± 0.8%），其次是甘油处理（10.0 ± 0.3%）和未处理（2.5 ± 0.2%）。
Strontium titanate (SrTiO3) is a typical perovskite material due to its crucial properties such as a good dielectric constant and favorable conductivity. Early studies reported that hydroxyl (OH) groups can manipulate the shape of the SrTiO3surface and control the crystal growth by changing the surface energy. This concept may be used to increase the population of (111) surfaces to form more Σ3 grain boundaries, which have lower energy for high ionic conductivity. In this study, two common OH additives, glycerol and 1,2-propanediol, were used for preparation of SrTiO3powders. SrTiO3powders were synthesized by spray pyrolysis and then sintered to form polycrystalline SrTiO3. The results showed that the additive-treated SrTiO3powders had a higher population of (111) planes and exhibited higher conductivity than did un-treated powder. In addition, the highest population of Σ3 grain boundaries was generated by 1,2-propanediol treatment (11.0 ± 0.8%) of SrTiO3, followed by glycerol treatment (10.0 ± 0.3%) and no treatment (2.5 ± 0.2%), respectively.