摘要
利用差热分析、X射线衍射和透射电子显微镜等技术对溶胶-凝胶法合成的凝胶的晶化过程进行了分析,实验结果表明,Bi4Ti3O12非晶凝胶晶化过程经历了四个过程:首先在433℃先形成了Bi2O3和TiO2亚稳相,然后在488℃时TiO2亚稳相与Bi2O3反应形成Bi,Ti复合氧化物亚稳相Bi2Ti4O11,随后在644℃时Bi2Ti4O11与Bi2O3继续反应形成四方Bi4Ti3O12相,最后在830℃附近发生了四方Bi4Ti3O12相向稳定的正交Bi4Ti3O12相转变.
The phase transformation of amorphous bismuth titanate fabricated by sol-gel method was investigated by X-ray diffraction （XRD）, transmissions electron microscopy （TEM） and differential thermal analysis （DTA）. The experimental results show that the four-step crystallizations were present on heating. The metastable phases Bi2O3 and TiO2 were formed firstly at 433℃, and Bi2Ti4O11 phase was subsequently formed at 488℃ by the reaction between Bi2O3 and TiO2. Sequential reaction between Bi2 Ti4 O11 and Bi2O3 resulted in the formation of Bi4 Ti3 O12 phase with tetragonal structure at about 644℃, and stable Bi4 Ti3 O12 phase with orthorhombic structure was finally formed at about 830℃.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第6期3080-3085,共6页
Acta Physica Sinica
关键词
钛酸铋
铁电材料
溶胶凝胶
非晶
晶化过程
bismuth titanate, ferroelectric material, sol-gel, amorphous, crystallization behavior
