Effect of Bi2O3 Additives on Properties of La0.7Ca0.3CrO3
来源期刊：JOURNAL OF RARE EARTHS2005年第1期
论文作者：MENG Guangyao Liu Xingqin Zhou Xiaoliang Zhong Honghai
Key words：La0.7Ca0.3CrO3; gel-casting process; sintering aid; electrical conductivity; rare earths;
Abstract: Sintering characteristics of Ca-doped lanthanum chromite [La(Ca)CrO3] powder, prepared by gel-casting process were studied by measuring density and the evaluation of micro structural information. Bi2O3 is found to be an effective sintering additive for this material. The amount of Bi2O3 is altered to investigate Bi2O3 effect on the properties of La0.7Ca0.3CrO3. The amount of 10% (mass fraction) Bi2O3 is suitable to increase sinter-ability of La0.7Ca0.3CrO3. 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 Bi2O3 does not have any significant effect on these properties.
MENG Guangyao1，Liu Xingqin1，Zhou Xiaoliang1，Zhong Honghai1
(1.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China)
Abstract:Sintering characteristics of Ca-doped lanthanum chromite [La(Ca)CrO3] powder, prepared by gel-casting process were studied by measuring density and the evaluation of micro structural information. Bi2O3 is found to be an effective sintering additive for this material. The amount of Bi2O3 is altered to investigate Bi2O3 effect on the properties of La0.7Ca0.3CrO3. The amount of 10% (mass fraction) Bi2O3 is suitable to increase sinter-ability of La0.7Ca0.3CrO3. 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 Bi2O3 does not have any significant effect on these properties.
Key words:La0.7Ca0.3CrO3; gel-casting process; sintering aid; electrical conductivity; rare earths;
【全文内容正在添加中】
