The molten-salt method was used to synthesize CaBi2Ta2O9 (CBTa) powder, and the influence of temperature on the structure and micromorphology of products was investigated using X-ray diffraction and the scanning and transmission electron microscope. The results showed that highly crystalline CBTa nanoplates exhibit single orthorhombic symmetry and could be obtained in the temperature range of 850–900 °C. Among which, the nanoplates prepared at 900 °C have optimal properties (average grain size of 1.7 μm and uniform size distribution). Above 900 °C, various CaO–Ta2O5 binary compounds, Bi2O3, and BiTaO4 formed due to the decomposition of CBTa and subsequent reactions of decomposition products, transforming plate-like grains to cuboid nano-particles with a small amount of prismatic grains. Possible reaction mechanisms at different synthesizing temperature were proposed. This work provides a method for the preparation of template grains to synthesize textured CaBi2Ta2O9 high-temperature piezoelectric ceramics by the template grain growth method.

采用熔融盐法合成了CaBi 2 Ta 2 O 9（CBTa）粉末，并利用X射线衍射和扫描电子显微镜研究了温度对产物结构和微观形貌的影响。结果表明，高度结晶的CBTa纳米板表现出单一的正交对称性，可以在850-900°C的温度范围内获得。其中，在900°C下制备的纳米板具有最佳性能（平均晶粒尺寸为1.7μm，尺寸分布均匀）。高于900°C，各种CaO–Ta 2 O 5二元化合物，Bi 2 O 3和BiTaO 4由于CBTa的分解和随后的分解产物的反应而形成的纳米管，将板状晶粒转变为长方体纳米颗粒，并带有少量棱柱形晶粒。提出了不同合成温度下可能的反应机理。这项工作提供了一种制备模板晶粒的方法，该模板晶粒通过模板晶粒生长法合成有织纹的CaBi 2 Ta 2 O 9高温压电陶瓷。