Influence of Sintering Aids on Dielectric Properties of Nd(Zn1/2Ti1/2)O3 Ceramics and Their Applications at Microwave Frequency

• Main Authors: Hsin-Hao Yen, 顏昕皓
• Other Authors: Cheng-Liang Huang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/52549509965141238375

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === The influence of sintering aids on dielectric properties of Nd(Zn1/2Ti1/2)O3 ceramic at microwave frequency would be discussed in this paper. We expected to decrease the sintering temperature of Nd(Zn1/2Ti1/2)O3 by adding three kinds of different sintering aids : Fe2O3、ZnO and V2O5 respectively. The experiment results showed that adding 0.75 wt% ZnO could not only achieve the goal of reducing sintering temperature but also reach to the best dielectric properties amount three kinds of sintering aids. Adding 0.75 wt% ZnO has high dielectric constant(εr) of 32.26，Q×f ~128000 (7.7GHz) and τf ~-45 (ppm/oC) while reducing the sintering temperature from 1330 oC to 1300 oC. In the end, we designed and fabricated a microstrip band pass filters with one tunable transmission zero in upper band of mid-band frequency 2.0 GHz on FR4 、Al2O3 and Nd(Zn1/2Ti1/2)O3 + 0.75 wt% ZnO substrates. We could find that with the higher dielectric constant(εr) and Q×f , our filter could diminish the scale of size and demonstrate better frequency response.