| Title |
Structural and Dielectirc Properties of Ba_{0.5}Sr_{0.5}TiO_3 Thick Films Doped with MgO |
| Authors |
강원석(Kang, Won-Seok) ; 남성필(Nam, Sung-Pil) ; 고중혁(Koh, Jung-Hyuk) ; 이성갑(Lee, Sung-Gap) ; 이영희(Lee, Young-Hie) |
| Keywords |
Sol-Gel ; screen printing ; BST ; MgO ; thick film |
| Abstract |
Using the Ba_{0.5}Sr_{0.5}TiO_3(BST) powders prepared by the Sol-Gel method, the BST thick films were fabricated on the Al_2O_3 substrates coated with Pt by the screen printing method. Compared with pure BST thick films, the structural and dielectric properties of the BST thick films doped with 1~10 wt% MgO were investigated. It was observed that the Mg substitution into BST causes a shift in the cubic-tetragonal BST phase transition peak to a lower temperature. The microstructure of the BST substituted with Mg was homogeneous and dense. Mg substitution into BST had a significant effect on the grain size reduction. Dielectric constant was decreased with increasing the MgO content and temperature. In the case of BST thick films doped with 1 wt% MgO, the relative permittivity and dielectric loss were 1581 and 1.4 % at 1 MHz. |