Bulletin of Materials Science | |
Effect of fluxing additive on sintering temperature, microstructure and properties of BaTiO3 | |
关键词: Electronic materials; Raman spectroscopy; dielectric properties; microstructure.; | |
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】
CC BY
【 预 览 】
Files | Size | Format | View |
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RO201902181998073ZK.pdf | 1106KB | download |