| 초록 |
The properties of lanthanum chromites with various doping materials were investigated in terms of sintering capability and electrical conductivity. For this purpose, doped-lanthanum chromites were prepared by two types of co-preparation and Pechini methods. XRD analysis revealed that the doped-lanthanum chromites have a single phase of perovskite structure. The particle size of doped-lanthanum chromites were controlled by high energy ball milling process and were characterized by PSA. The electrical conductivity was measured by D.C. fourprobe method. From the experimental methods, we concluded that the sinterability is closely related to the second phase transformation, that is, the second phase melting above 1300 ℃ significantly promotes the sinterability. In case of electrical conductivities, Ca-doped lanthanum chromite showed better electrical conductivity than Sr-doped one. |
