Burned before and after La 2O3XRD of powders and LaCrO of different burnt materials 3EDS results
Lanthanum chromite (LaCr O3) Is widely used in solid oxide fuel cells, magnetic fluid generators and furnace materials for heating due to its high melting point, high electrical conductivity and chemical stability in a redox environment, but its drawback is that LaCr O3Sintering performance in the air is not good, not dense. It is generally believed that the academic community is due to its volatility above 1000 ℃ gaseous Cr O3, Resulting in poor sintering performance.
Chinese Academy of Sciences Xinjiang Institute of Physics and Chemistry Material Physics and Chemistry Chang Aimin research team, for many years dedicated to the thermal functional ceramic materials research and application of the team researchers based on LaCr O3Volatile at high temperatures produce gaseous CrO 3Resulting in its sintering is not dense assumptions, designed by different materials (Al 2O3La 2O3, Cr 2O3Etc.) Burning LaCr O3In order to improve its compactness of sintering.The results show that La 2O3Burned LaCr O3The compactness is greatly enhanced, which indicates that compact LaCr is sintered in the air O3Is achievable. EDS results revealed sintered LaCrO 3The content ratio of Cr and La is less than 1; after burnt La 2O3The Cr element found in the powder indicates that LaCr O3Cr volatilization occurs at high temperature sintering.Furthermore, X-ray diffraction (XRD) results show that LaCr O3Phase formation, which proves LaCr from the side O3(s) + 3/4 O 2(g) Generate 1/2 La 2O3(s) + Cr O3(g), confirmed from the sintering mechanism LaCr O3Volatile gas produced under high temperature Cr O3Lead to the assumption that its sintering is not dense.
Relevant research results published in the "American Ceramics" (J. Am. Ceram. Soc.), The first author of the article is a master's graduate India xinglian.
The research work has been funded by the National Natural Science Foundation of China and the Xinjiang Uygur Autonomous Region Science and Technology Talent Training Project.
