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Structure and transport properties of composite materials on a basis of Ce0.8Nd0.2O2-δ and BaCe0.8Nd0.2O3-δ

Ju. G. Lyagaeva, D. A. Medvedev

Abstract


In the present work the synthesis of materials was carried out by one-step citrate-nitrate method. The optimal synthesis temperature of the powders was chosen on the base of TG-DSC data. Phase nature of the synthesized materials was investigated by XRD and Rietveld refinement data analyzes. The influence of the perovskite phase content in the system of (1-x)Ce0.8Nd0.2O2-δ-xBaCe0.8Nd0.2O3-δ ( x = 0 , 0.25, 0.5 , 0.75 and 1) on the crystallite and particle size of powders and structure properties of ceramics (relative density, porosity, grain size) were investigated. Measurements of the electrical conductivity of materials in a wide ranges of temperatures (550-900 °C) and oxygen partial pressure (10-23≤pO2/atm≤0,21) revealed features of transport in the composite system.

Keywords


ceramics; relative density; porosity; grain size; oxygen partial pressure

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References


Venkatasubramanian A, Copalan P, Prasanna T. Synthesis and characterization of electrolytes based on BaO–CeO2–GdO1.5 system for Intermediate Temperature Solid Oxide Fuel Cells. Int J Hydrogen Energy. 2010;35(10):4597-605. doi:10.1016/j.ijhydene.2010.02.037

Sun W, Jiang Y, Wang Y, Fang S, Zhu Z, Liu W. A novel electronic current-blocked stable mixed ionic conductor for solid oxide fuel cells. J Power Sources. 2011;196(1):62-8. doi:10.1016/j.jpowsour.2010.07.038

Medvedev D, Maragou V, Pikalova E, Demin A, Tsiakaras P. Novel composite solid state electrolytes on the base of BaCeO3 and CeO2 for intermediate temperature electrochemical devices. J Power Sources 2013;221:217-27. doi:10.1016/j.jpowsour.2012.07.120

Huang J, Zhang L, Wang C, Zhang P. CYO–BZCYO composites with enhanced proton conductivity: Candidate electrolytes for low-temperature solid oxide fuel cells. Int J Hydrogen Energy. 2012;37(17):13044-52. doi:10.1016/j.ijhydene.2012.05.040

Oxygen partial pressure regulator Zirconia-318 [Internet]. Ekaterinburg (Russia): [publisher unknown]; [cited 2015]. Available from: http://zirconiaproject.wordpress.com/devices/zirconia-318/. Russian.




DOI: http://dx.doi.org/10.15826/chimtech.2015.2.1.003

Copyright (c) 2015 Ju. G. Lyagaeva, D. A. Medvedev

© Chimica Techno Acta, 2014-2018
ISSN 2411-1414 (Online), ISSN 2409-5613 (Print)

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