Investigation on the calcining condition and sintering temperature of perovskite-type La0.7Ca0.3CrO3 complex oxides by a combustion method |
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| Authors: | Wenfeng Guo Qing Xu Duanping Huang Tifeng Jiao Faming Gao |
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| Affiliation: | 1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, China;2. Department of Mechanical and Electrical Engineering, Nanjing Communications Institute of Technology, Nanjing 211188, China;3. Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210046, China;1. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;3. College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325027, PR China;1. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46 PL-02668, Warsaw, Poland;2. Faculty of Chemistry, Maria Curie-Sklodowska University, Pl. Marii Curie-Sk?odowskiej 2, PL-20031 Lublin, Poland;1. Nanomaterials and Sensor Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, 14204 NE Salmon Creek Avenue, Vancouver, WA 98686, United States;2. Sensors and Electrochemical Devices Group, Los Alamos National Laboratory (LANL), Los Alamos, NM 87545, United States |
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| Abstract: | Perovskite-type La0.7Ca0.3CrO3 composite oxides were synthesized by a combustion method. The calcining condition of the synthesized powders and sintering temperature of ceramic specimens were studied. It was found that a pure perovskite structure was direct acquired in the combustion ash and the fine morphology (～100 nm) was observed in the sample calcined at 600 °C. In view of the relative density, microstructure and electrical conducting properties of the sintering ceramics at different temperatures, the preferred sintering temperature was ascertained to be 1300 °C, at which the sample attains a high relative density of 96.8%, showing an electrical conductivity of 53.6 S cm?1 at 800 °C and much lower activation energy of 0.122 ev. Compared with La0.7Ca0.3CrO3 synthesized by the conventional solid state reaction method, that synthesized by the combustion method exhibits fine morphology and superior sintering activity, effectively lowering the sintering temperature and enhancing electrical conducting properties of the material. |
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