Diffuse phase transition, piezoelectric and optical study of Bi0.5Na0.5TiO3 ceramic

Bulletin of materials science

S K Rout¹  B Parija³  V Senthil³  S Panigrahi³  T Badapanda² 

[1] Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi 835 215, India$$Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi 835 215, IndiaDepartment of Applied Physics, Birla Institute of Technology, Mesra, Ranchi 835 215, India$$;Department of Physics, C V Raman College of Engineering, Bhubaneswar 752 054, India$$Department of Physics, C V Raman College of Engineering, Bhubaneswar 752 054, IndiaDepartment of Physics, C V Raman College of Engineering, Bhubaneswar 752 054, India$$;Department of Physics, National Institute of Technology, Rourkela 769 008, India$$Department of Physics, National Institute of Technology, Rourkela 769 008, IndiaDepartment of Physics, National Institute of Technology, Rourkela 769 008, India$$

关键词: Dielectric;    piezoelectric;    diffuse phase transition;    optical study.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Bismuth sodium titanate, Bi_0.5Na_0.5TiO₃ (BNT) is considered to be an excellent candidate for a key material of lead-free dielectric ceramics. In this study, we propose the dielectric and optical study of single phase BNT powder prepared by solid-state reaction route. The phase formation and structural study were done by X-ray diffraction (XRD) which shows well developed crystallite with a pure perovskite phase. The ceramic was sintered at different temperatures from 1050°C to 1175°C to study the effect of sintering temperature on the morphology and density. It was found that the sample sintered at 1150°C shows the highest density. The microstructure of the ceramic was investigated by scanning electron microscopic (SEM) technique. The temperature-dependent dielectric study of the sample sintered at 1150°C was done in the frequency range of 50 kHzâ€�??1 MHz which shows a diffuse phase transition. The piezoelectric constant (ð‘�??₃₃) was found to be 41 pCN^-1. The Pâ€�?�E hysteresis loop confirms the ferroelectric behaviour in the ceramic. The UVâ€�?�Vis spectrum indicated that the Bi_0.5Na_0.5TiO₃ ceramic has an optical band gap of 2.94 eV.

【 授权许可】

Unknown