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采用固相烧结法制备Ba(Mg_(1/3)Ta_(2/3))O_3+x%ZrO_2(BMZT)微波介质陶瓷,研究了ZrO_2掺杂对Ba(Mg_(1/3)Ta_(2/3))O_3(BMT)微波介质陶瓷结构和介电性能的影响。结果表明:陶瓷体系中存在2种相,主晶相Ba(Mg_(1/3)Ta_(2/3))O_3和附加相Ba_(0.5)TaO_3。随着x的增大,陶瓷体系的相结构由六方结构逐渐向立方结构转变,同时有序相由1:2有序结构逐渐向1:1有序结构转变。添加适量的ZrO_2可以促进液相烧结,当x=8时,陶瓷致密化烧结温度由纯相时的1 650℃以上降至1 450℃,表观密度ρ=7.568 g/cm~3,相对理论密度达到99.1%,BMZT体系拥有良好的微波介电性能:相对介电常数ε_r=25.5,品质因数与谐振频率的乘积Qf=137 600 GHz(8GHz),谐振频率温度系数τ_f=0.3×10~(-6)/℃。
The microwave dielectric ceramics of Ba (Mg 1/3 Ta 2/3) O 3 + x% ZrO 2 (BMZT) were prepared by solid state sintering. The effects of ZrO 2 doping on the dielectric constant of Ba (Mg 1/3 Ta 2 / 3)) O_3 (BMT) microwave dielectric ceramics structure and dielectric properties. The results show that there are two phases in the ceramic system: Ba (Mg 1/3 Ta 2/3) O 3 and Ba 0.5 TaO 3. With the increase of x, the phase structure of the ceramic system gradually changes from the hexagonal structure to the cubic structure, and the ordered phase gradually changes from 1: 2 ordered structure to 1: 1 ordered structure. When x = 8, the densification sintering temperature of ceramic decreases from above 1 650 ℃ to 1 450 ℃ and the apparent density ρ is 7.568 g / cm ~ 3 when adding appropriate amount of ZrO_2. Relative theory The density of the BMZT system is 99.1%. The microwave dielectric properties of the BMZT system are as follows: the relative permittivity ε_r = 25.5, the product of the quality factor and the resonance frequency Qf = 137 600 GHz (8GHz), the temperature coefficient of resonance frequency τ_f = 0.3 × 10 ~ -6) / ° C.