Microwave dielectric properties of Ba_3Ti_(4-x)(Zn_(1/3)Nb_(2/3)_xNb_4O_(21) for low temperature co-fired ceramics

摘要

The effects of substitution of (Zn_(1/3)Nb_(2/3)) for Ti on the sintering behavior and microwave dielectric properties of Ba_3Ti_(4-x)(Zn_(1/30Nb_(2/3))_xNb_4O_(21) (0 < = x < = 4) ceramics have been investigated. The dielectric constant (?_r) and the temperature coefficient of the resonant frequency (?_f) of Ba_3Ti_(4-x)(Zn_(1/3)Nb_(2/3)_xNb_4O_(21) ceramics decreased with increasing x. However, the Q X f values enhanced with the substitution of (Zn_(1/3)Nb_(2/3)) for Ti. It was found that a small amount of MnCO_3-CuO (MC) and ZnO-B_2O_3-SiO_2 (ZBS) glass additives to Ba_3Ti_(4-x)(Zn_(1/3)Nb_(2/3)_xNb_4O_(21) (x=2) ceramics lowered the sintering temperature from 1250 to 900 °C. And Ba_3Ti_(4-x)(Zn_(1/3)Nb_(2/3)_xNb_4O_(21) (x = 2) ceramics with 1 wt% MC and 1 wt% ZBS sintered at 900°C for 2h showed excellent dielectric properties: ?_r= 53, Q x f= 14,600 GHz, ?_f=6ppm/°C. Moreover, it has a chemical compatibility with silver, which made it as a promising material for low temperature co-fired ceramics technology application.