Effect of Ba nonstoichiometry on the phase composition,microstructure, chemical stability and electrical conductivity of BaxCe0.7Zr0.1Y0.1Yb0.1O3?δ (0.9≤x≤1.1) proton conductors |
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| Affiliation: | 1. College of Chemical Engineering, Hebei United University, Tangshan 063009, PR China;2. Department of Chemistry, Harbin Institute of Technology, Harbin 150001, PR China;1. George S. Ansell Department of Metallurgy and Materials Engineering, Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401, USA;2. University of Colorado School of Medicine, Department of Orthopaedics, Aurora, CO 80045, USA;1. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China;2. State Grid of China Technology College, Jinan 250002, China;1. Department of Chemistry, Moscow State University, Moscow 119991, Russia;2. Institute of Problems of Chemical Physics RAS, Acad. Semenov av. 1, Chernogolovka, Moscow District 142432, Russia;1. Division of Advanced Materials Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;2. Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;1. High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea;2. Department of Fuel Cells and Hydrogen Technology, Hanyang University, Seoul, Republic of Korea;3. Department of Materials Science & Engineering, Korea University, Seoul, Republic of Korea |
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| Abstract: | The perovskite proton conductors BaxCe0.7Zr0.1Y0.1Yb0.1O3?δ (x=0.9, 0.94, 0.98, 1.0, 1.03, 1.06, and 1.1) have been successfully prepared by the conventional solid state reaction route. X-ray diffraction (XRD) patterns of the samples indicate that BaxCe0.7Zr0.1Y0.1Yb0.1O3?δ (x≥1.0) samples possess a single phase orthorhombic structure, but a secondary phase (Y,Ce)O2?δ exists in BaxCe0.7Zr0.1Y0.1Yb0.1O3?δ (x<1.0) samples. SEM photographs show that the grain size of BaxCe0.7Zr0.1Y0.1Yb0.1O3?δ increases and the porosity decreases with Ba2+ content varying from x=0.9 to 1.1. Because of ZnO addition as sintering aid, the sintering temperature of the samples reduces from 1550 °C to 1250 °C. The chemical stability of the samples against CO2 decreases with the increase in Ba content from x=0.9 to 1.1. All the samples show a excellent stability against water vapor at 850 °C. The conductivities of the samples increase and the activation energies reduce with the increase in Ba content. The present results suggest that it is very important to control the stoichiometry of cations to obtain desired perovskite type high temperature proton conductors. |
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| Keywords: | C Electrical conductivity Nonstoichiometry Microstructure Chemical stability |
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