Study of dielectric and ferroelectric properties of five-layer Aurivillius oxides: A2Bi4Ti5O18 (A = Ba, Pb and Sr) synthesized by solution combustion route

Bulletin of materials science

Rajnish Kurchania¹  Shivangi Dubey¹ 

[1] Department of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal 462 003, India$$Department of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal 462 003, IndiaDepartment of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal 462 003, India$$

关键词: Ceramics;    X-ray diffraction;    dielectric properties;    ferroelectric properties.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

This paper presents the ferroelectric and dielectric properties of five-layer Aurivillius oxides (Ba₂Bi₄Ti₅O₁₈, Pb₂Bi₄Ti₅O₁₈ and Sr₂Bi₄Ti₅O₁₈) prepared by a solution combustion route with glycine as a fuel at low calcination temperature. The phase formation of these materials with pseudo-tetragonal structure was achieved after calcination at 750°C for 3 h; as confirmed by X-ray diffraction studies. Scanning electron microscopy of the sintered ceramics shows that the grains exhibit a plate-like morphology. The ferroelectric to paraelectric transition temperature (ð‘�??_ð‘�?) for Ba-, Pb- and Sr-based bismuth titanate ceramics was found to be 350, 280 and 260°C, respectively. All three materials show multiple relaxation phenomena and their electrical conductivity was found to be temperature dependent. The Pb₂Bi₄Ti₅O₁₈ ceramic possessed the highest value of activation energy (0.68 eV) and hence shows better ferroelectric properties, as compared to barium and strontium bismuth titanates.

【 授权许可】

Unknown