Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7920497 | Journal of Physics and Chemistry of Solids | 2018 | 16 Pages |
Abstract
The dielectric performance of BaTiO3 ceramic coatings is enhanced significantly by the addition of ZnO. In this study, the maximum relative permittivity value (εrâ¯ââ¯923) was measured in BaTiO3 coatings with ZnO added at 6â¯wt%. The Curie temperature (Tc) was in the range of 111â¯Â°C-121â¯Â°C for all of the ZnO-modified BaTiO3 coatings. Tc shifted to low temperatures as the ZnO content increased. Detailed analyses were performed to determine the phase composition and optical band gaps of powders collected in liquid nitrogen, which showed that the Zn2+ ions were incorporated into the BaTiO3 lattice where they substituted into the Ti4+ sites, and the composite powders (BaTiO3 + 6 wt% ZnO) tolerated high temperatures in the plasma beam. In addition, some residual Zn accumulated in the grain boundary in the form of ZnO. X-ray diffraction and Raman spectroscopy showed that the substitution led to changes in the compositional and structural properties. The red shift in the optical band gap of BaTiO3 indicated that the ZnTi'' defects caused by the dopants acted as carriers in the doped BaTiO3 coatings.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Zhe Liu, Zhiguo Xing, Haidou Wang, Zifan Xue, Shuying Chen, Xiufang Cui, Guo Jin,