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XRD of La2O3 powder before and after burning and EDS results of LaCrO3 with different buried materials
Lanthanum chromite (LaCr O 3) because of its high melting point, high electrical conductivity and chemical stability in the redox environment, widely used in solid oxide fuel cells, MHD generator and the heating furnace material. But its drawback is that LaCr O 3 sintered poor performance in the air, not dense. Because it is broad consensus that will volatilize at above 1000 ℃ gaseous Cr O 3, the sintering result in poor performance.
Chang Aimin research team of Materials Physics and Chemistry Research Institute of Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences has devoted many years to the research and application of thermal functional ceramic materials. The team of researchers LaCr O 3 volatilization gas at elevated temperature according CrO3 lead to sintering densification assumption design buried burning LaCr O Experiment 3 by a different material (Al2 O 3, La2 O 3 , Cr2 O 3 , etc.), To improve the compactness of its sintering. The results show, La2 O 3 burying burn LaCr O 3 denseness is greatly improved, which indicates that a dense sintered in air LaCr O 3 can be achieved. Energy dispersive spectroscopy (EDS) found after sintering of LaCrO3 of Cr and a content of La is less than 1; La2 O 3 powder was found buried after burning of Cr element indicates, LaCr O 3 Cr volatilization is present at a high temperature sintering. Further, the buried La2O3 powder after burning X-ray diffraction (XRD) and found to be LaCr O 3 phase is formed, which proves LaCr O 3 (s) from the side of + 3/4 O2 (g) generating a 1/2 La 2 O 3 (s) + Cr O 3 (g), confirms LaCr O 3 at a high temperature to produce a gaseous volatile Cr O 3 does not lead to dense sintering assumed from the sintering mechanism.
The relevant research results were published in the "J. Am. Ceram. Soc." The first author of the article was a graduate student, Ying Xinglian.
The research work was funded by the National Natural Science Foundation of China and the Xinjiang Science and Technology Talent Cultivation Project.
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