A novel Co-ions complexation method to synthesize pyrochlore La2Zr2O7 |
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| Affiliation: | 1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA;3. Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, PR China;1. College of Engineering, Bohai University, Jinzhou 121013, China;2. College of New Energy, Bohai University, Jinzhou 121013, China;1. College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China;3. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, China;4. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China;1. Department of Chemistry, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, TX, 78539, USA;2. Department of Life and Physical Sciences, Fisk University, Nashville, TN, 37208-3051, USA |
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| Abstract: | Pure pyrochlore Lanthanum zirconate (LZ) was synthesized by co-ions complexation method (CCM) at 1300 °C, which is 300 °C lower than that by solid-state method (SSM). At 1450 °C, the LZ prepared by CCM possessed lower thermal conductivity (1.15 W/m K) than that obtained by SSM (1.99 W/m K). This significant decrease may be caused by the different grain size, which is 300 nm and 2.5 μm synthesized by CCM and SSM, respectively. LZ precursor was belt-shaped and the belt shorten and the grain grown with the temperature increasing. Fourier transform infrared spectroscopy suggested the solidification in CCM forms from the complexation between La3+, Zr4+ and CH3COO−, which is the key for solidification. Compared to SSM, CCM is a lower temperature and simpler technology to synthesize nano-size LZ and other rare-earth oxides. |
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| Keywords: | Lanthanum zirconate Co-ions complexation method Solid-state method Thermal barrier coatings Thermal conductivity |
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