烧结气氛对X8R陶瓷材料结构与性能的影响

Effects of Sintering Atmospheres on Microstructures and Dielectric Properties of X8R Ceramic Materials

研究了Yb/Mg受主离子协同掺杂对BaTiO3陶瓷材料分别在空气、还原性气氛中,以及热处理过后的结构与性能的影响。X-射线衍射(XRD)分析表明,还原性气氛烧结抑制了受主离子在BaTiO3中的固溶度,使材料出现第二相Yb2Ti2O7。差热扫描热分析(DSC)测量图谱表明,过量的Yb掺杂破坏了陶瓷的壳-芯结构。在不同的气氛烧结条件下,通过适当调整Yb/Mg掺杂量,可获得既适用于Pd/Ag内电极又适用于Ni内电极且满足在-55^+150℃范围内,容量随温度的变化率满足±15%内(X8R)特性要求的多层陶瓷电容器(MLCC)介质材料。

The effects of Yb/Mg co-doping on microstructures and electrical properties of BaTiO3 ceramics, which were sintered under oxidizing, reducing and annealing conditions, were investigated in this paper. XRD analyses indicated that the solubility of the acceptor ions in BaTiO3 was suppressed, resulting in the presence of the second phase Yb2Ti2O7 under reducing and annealing conditions. DSC measurements revealed that too much addition of Yb caused the collapse of core-shell structure in BaTiO3 ceramics. X8R MLCC dielectric materials, which can be applied to both Pd/Ag and Ni inner electrodes, were obtained by adopting appropriate Yb/Mg ratio and sintered atmosphere.