Modification of microwave dielectric properties of MgTiO3 ceramics by a layered structure

• Main Authors: Chia -Wen Kuo, 郭嘉文
• Other Authors: Yi-Cheng Liou
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/27722805310699843290

碩士 === 崑山科技大學 === 電子工程研究所 === 101 === Modification of microwave dielectric properties of MgTiO3 ceramics by a layered structure was investigated in this study. MgTiO3 cermics were stacked with SrTiO3, CaTiO3, and Ba5Nb4O15, respectively. When the thickness of SrTiO3, CaTiO3, and Ba5Nb4O15 increased, dielectric constant (εr) and the temperature coeffcient of resonant frequency (τf) of the layred stack increased. On the contrary, the resonant frequency (f0) and quality factor (Q×f) decreased. MgTiO3 stacked with 8.57% SrTiO3 resulted in τf = 8 ppm/°C, Q×f = 58145 GHz, and εr = 18.97. When 8.57% CaTiO3 was stacked, τf = -34 ppm/°C, Q×f = 37577 GHz, and εr = 18.9 were obtained, 12% CaTiO3 was suggested to obtain a τf of 0 ppm/°C. MgTiO3 stacked with 42.86% Ba5Nb4O15 resulted in τf = 0 ppm/°C, Q×f = 10756 GHz, and εr = 25.7. The layered structure is effective in modifying the microwave dielectric properties of MgTiO3 ceramics.