Sintering characteristics of Ca-doped lanthanum chromite [La(Ca)CrO_3] powder, prepared by gel-casting process were studied by measuring density and the evaluation of micro structural information. Bi_2O_3 is found to ...Sintering characteristics of Ca-doped lanthanum chromite [La(Ca)CrO_3] powder, prepared by gel-casting process were studied by measuring density and the evaluation of micro structural information. Bi_2O_3 is found to be an effective sintering additive for this material. The amount of Bi_2O_3 is altered to investigate Bi_2O_3 effect on the properties of La_(0.7)Ca_(0.3)CrO_3. The amount of 10% (mass fraction) Bi_2O_3 is suitable to increase sinter-ability of La_(0.7)Ca_(0.3)CrO_3. Increased concentration of point defects arising form substitution of Bi in La site is the plausible cause of enhanced sintering. Measurement of electrical conductivity and thermal expansion coefficient indicate that the doping of Bi_2O_3 does not have any significant effect on these properties.展开更多
基金Project supported by the Natural Science Foundation of China (20271047) and the Ministry of Science and Technology of China (G2000026409)
文摘Sintering characteristics of Ca-doped lanthanum chromite [La(Ca)CrO_3] powder, prepared by gel-casting process were studied by measuring density and the evaluation of micro structural information. Bi_2O_3 is found to be an effective sintering additive for this material. The amount of Bi_2O_3 is altered to investigate Bi_2O_3 effect on the properties of La_(0.7)Ca_(0.3)CrO_3. The amount of 10% (mass fraction) Bi_2O_3 is suitable to increase sinter-ability of La_(0.7)Ca_(0.3)CrO_3. Increased concentration of point defects arising form substitution of Bi in La site is the plausible cause of enhanced sintering. Measurement of electrical conductivity and thermal expansion coefficient indicate that the doping of Bi_2O_3 does not have any significant effect on these properties.
