Effect of fluxing additive on sintering temperature, microstructure and properties of BaTiO3

Bulletin of materials science

Riaz Ullah¹  M Naeem Khan¹  Asad Jamal¹  Yaseen Iqbal¹  Rick Ubic² 

[1] Materials Research Laboratory, Institute of Physics & Electronics, University of Peshawar, Peshawar 25120, Pakistan$$Materials Research Laboratory, Institute of Physics & Electronics, University of Peshawar, Peshawar 25120, PakistanMaterials Research Laboratory, Institute of Physics & Electronics, University of Peshawar, Peshawar 25120, Pakistan$$;College of Engineering, Boise State University, Idaho, USA$$College of Engineering, Boise State University, Idaho, USACollege of Engineering, Boise State University, Idaho, USA$$

关键词: Electronic materials;    Raman spectroscopy;    dielectric properties;    microstructure.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Various fluxing materials are added to technical ceramics in an attempt to lower their sintering temperatures and make their processing economical. The effect of 0.3wt%Li₂CO₃ addition on the phase, microstructure, phase transition temperatures and dielectric properties of BaTiO₃ was investigated in the present study. The addition of 0.3wt% Li₂CO₃ was observed to lower the optimum sintering temperature by ∼200°C with no second phase formation and cause a five-fold reduction in grain size. Rhombohedral-to-orthorhombic and tetragonal-to-cubic phase transitions at the expected temperatures were evident from the Raman spectra, but the orthorhombic-totetragonal phase transition was not clearly discernible. The persistence of various phase(s) at higher temperatures in the flux-added materials indicated that the phase transitions occurred relatively slowly. A decrease in dielectric constant of Li₂O-added BaTiO₃ in comparison to pure BaTiO₃ may be due to the diminished dielectric polarizability of Li⁺ in comparison to Ba²⁺.

【 授权许可】

Unknown