Synthesis and Electrical Properties of Aurivillius-type Sodium Bismuth Titanate at Low Temperatures [Aurivillius型钛酸铋钠的低温合成及电性能研究]

作者：Fan J.; He X.^*; Chen D.

来源：Rare Metal Materials and Engineering, 2018, 47: 213-217.

• Dielectric properties
• Hydrothermal
• Na0.5Bi4.5Ti4O15
• Nanopowders

The Aurivillius-type sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) powders were prepared by two-step hydrothermal routes with starting chemicals containing Bi(NO3)3?5H2O, Ti(C4H9O)4 and CH3COONa?3H2O. The crystalline phase and morphology of hydrothermally derived powders were investigated by XRD and SEM, and the microstructure and electrical properties of derived ceramics were measured. The results indicate that the elemental ratio in the composition of hydrothermally derived nanopowders is very close to stoichiometric ratio of NBT, which possesses an average diameter of about 1.0 μm and a thickness of less than 100 nm. The synthesis temperatures of NBT nanopowders are as low as 260~270℃, which is the lowest temperature among those published literatures. Compared with NBT ceramics by solid state sintering process, the ceramics resulting from hydrothermally derived powders, with dense ceramic body and fine grain size (<2 μm), have very similar Curie temperature (≈674℃) and improved dielectric properties at high temperature.

• 单位
  华南理工大学