Toward nanograined gadolinia doped ceria via two-step sintering at ultralow temperature and its electrical conductivity |
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| Affiliation: | 1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China;2. College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan, 637009, China;1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Science and Technology, Guilin, 541004, China;2. ARC Hub for Computational Particle Technology, Monash University, Clayton, Victoria, 3800, Australia;1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China;2. Bruker (Beijing) Scientific Technology Co., Ltd, Shanghai, 200233, China;3. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610068, China;2. The Second Research Institute of Civil Aviation Administration of China (CAAC), Chengdu, 610041, China |
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| Abstract: | Highly dense (>98%) and nanograined (∼60 nm) gadolinia doped ceria are obtained from ultrafine powders by adopting two-step sintering (TSS) procedure at an ultralow temperature of 750 °C with a dwell time of 20 h, which is the lowest sintering temperature for ceria family without sintering aids up to now. Electrochemical impedance spectroscopy investigations suggest that the electrical conductivities of densified electrolytes are closely related to sintering temperature and grain size, and GDC900-750 exhibits the highest total electrical conductivity of 3.640 S m−1 at 700 °C in air. Fitting calculation indicates partial grain-size dependence of oxygen vacancy association enthalpy and grain-size independence of oxygen ion migration enthalpy. Grain boundary maturity influences on grain boundary conductivity to some extent, and younger grain boundary endues the densified electrolytes with higher grain boundary conductivity. |
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| Keywords: | Gadolinia doped ceria Two-step sintering Electrical conductivity Nanograined electrolyte |
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