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采用固相烧结法,探讨了MnCO_3掺杂降低Ba(Mg_(1/3)Nb_(2/3))O_3(BMN)烧结温度的机理,研究了MnCO_3掺杂量对BMN陶瓷微波介电性能的影响。结果表明,适量的MnCO_3掺杂可以促进烧结,有效降低BMN陶瓷的烧结温度,改善陶瓷的微波介电性能。当MnCO_3掺杂量为4%(质量分数)时,BMN陶瓷的烧结温度从纯相烧结时的1 550℃降低到1 250℃,表观密度ρ=6.36 g/cm~3,相对理论密度达到98.6%,并具有良好的微波介电特性:高相对介电常数ε_r=31.4,高品质因数与谐振频率的乘积Q·f=99 200 GHz(8 GHz),接近于零的谐振频率温度系数τ_f=3×10~(–7)/℃。
The mechanism of reducing the sintering temperature of Ba (Mg_ (1/3) Nb_ (2/3)) O_3 (BMN) by MnCO_3 doping was investigated by solid state sintering method. The effects of MnCO_3 doping on the microwave dielectric properties of BMN ceramics influences. The results show that proper amount of MnCO_3 doping can promote sintering, effectively reduce the sintering temperature of BMN ceramics and improve the microwave dielectric properties of ceramics. When the content of MnCO_3 is 4% (mass fraction), the sintering temperature of BMN ceramics decreases from 1 550 ℃ to 1 250 ℃ and the apparent density ρ is 6.36 g / cm ~ 3, and the relative theoretical density reaches 98.6% and has good microwave dielectric properties: high relative permittivity ε_r = 31.4, product of high quality factor and resonant frequency Q · f = 99 200 GHz (8 GHz), resonant frequency near zero temperature coefficient τ_f = 3 × 10 -7 / ° C.