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研究了BaZrO3、MnCO3对Ba(Zn1/3Nb2/3)O3(BZN)系统结构和介电性能的影响。表明BaZrO3及Mn-CO3均能有效降低系统的烧结温度。系统中加入过多的BaZrO3(BZ)会降低介电常数,增大介质损耗,并使容量温度系数负向发展;加入微量MnCO3对系统的介电性能影响不大。系统中加入的x(BaZrO3)=4%会生成较多的第二相BaNb2O6、BaZrO3摩尔分数增加至8%时,第二相消失。这是由于过多BZ的加入会在烧结温度到达前生成较多液相,促进烧结的同时也阻碍了ZnO的挥发,从而抑制了第二相的生成。向96%BZN-4%BZ中加入r(MnCO3)=0.5%,也会抑制第二相的生成,这可能是由于Mn2+占据了B′位Zn2+挥发后留下的空位,形成固溶体,没有形成富Nb液相区,从而抑制了第二相的生成。
The effects of BaZrO3 and MnCO3 on the structure and dielectric properties of Ba (Zn1 / 3Nb2 / 3) O3 (BZN) system were investigated. It shows that both BaZrO3 and Mn-CO3 can effectively reduce the sintering temperature of the system. Addition of too much BaZrO3 (BZ) into the system will reduce the dielectric constant, increase the dielectric loss, and make the capacity temperature coefficient negatively develop. Adding trace MnCO3 has little effect on the dielectric properties of the system. The addition of x (BaZrO3) = 4% in the system will generate more second phase BaNb2O6. When the mole fraction of BaZrO3 increases to 8%, the second phase disappears. This is because the addition of too much BZ generates more liquid phase before the sintering temperature is reached, promotes sintering and also hinders the volatilization of ZnO, thereby suppressing the formation of the second phase. The addition of r (MnCO3) = 0.5% to 96% BZN-4% BZ also suppresses the formation of the second phase, possibly due to Mn2 + occupying the vacancies left after the Zn2 + volatilization at the B ’position, forming a solid solution that did not form Nb-rich liquid phase, thereby suppressing the formation of the second phase.