Process and Properties of (1-x)CaNb2O6-xTiO2 and (Zn0.67Ni0.33)0.5Ti0.5NbO4 Microwave Dielectric Ceramics

• Main Authors: Ying-Jhih Wang, 王盈智
• Other Authors: 劉依政
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/f6bm67

碩士 === 崑山科技大學 === 電子工程研究所 === 97 === Properties of (1-x)CaNb2O6-xTiO2 (CNT) (x=0.1, 0.3, and 0.5) and (Zn0.67Ni0.33)0.5Ti0.5NbO4 (ZNTN) microwave dielectric ceramics produced using a reaction-sintering process were investigated. With TiO2 addition, the sintering temperature could be effectively lowered and density increased in CNT ceramics. Microwave dielectric properties: εr=20.7, Q×f = 42,900GHz (6.6GHz) were obtained in CNT with x=0.1 after sintering at 1270oC for 6 h. εr=20.6, Q×f=32,900GHz (6.4GHz) were obtained in CNT with x=0.3 after sintering at 1270oC for 6 h. Microwave dielectric properties: εr=17.2, Q×f = 22,100GHz (6.9GHz) were obtained in CNT with x=0.5 after sintering 1250oC for 4 h. The main phase Zn0.5Ti0.5NbO4 and second phase NiNb2O6 accompanied with small amount of Ni0.5Ti0.5NbO4 phase were observed in ZNTN ceramics sintered below 1250oC. Ni0.5Ti0.5NbO4 became the main phase in ZNTN ceramics sintered above 1300oC. Microwave dielectric properties: εr=43.1, Q×f=18,800GHz (6.2GHz) and τf =+12.72 ppm/oC were obtained in ZNTN after sintering at 1150oC for 2 h.