Sintering and Oxygen Transport in Ce0.8Pr0.2O2 − δ : A Comparative Study of Mn and Co Oxide Additives
作者： D. P. Fagg , S. García-Martin , M. J. Pascual , V. V. Kharton , J. R. Frade
DOI: 10.1149/1.3068396
关键词: Inorganic chemistry 、 Ionic conductivity 、 Cobalt oxide 、 Conductivity 、 Oxide 、 Oxygen transport 、 Sintering 、 Grain boundary 、 Grain size 、 Materials science
摘要: Minor additions of manganese oxide and cobalt are both shown to be good sintering aids for Ce 0.8 Pr 0.2 O 2-δ , a promising ceramic membrane material with comparable values partial oxygen-ionic electronic conductivities, offer dense ceramics submicron grain sizes under 1150°C. Transmission electron microscopy X-ray energy dispersive spectroscopy suggest the transition-metal addition located in boundary regions. The smallest size is observed case materials Mn additions. Whereas radically improves transport properties boosting level conductivity by two three times leaving ionic intact, detrimental, increasing activation while offering no benefit conductivity. These characteristic impact on levels oxygen permeation. flux significantly improved Co due an increased ambipolar surface kinetics, whereas improvement permeation comparison base composition . It has been suggested that very slight increase solubility transition bulk Mn-doped may explanation resultant properties.
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sci-hub.se 参考文章(39)
Zhang Tianshu, Peter Hing, Haitao Huang, J Kilner, None, Early-stage sintering mechanisms of Fe-doped CeO2 Journal of Materials Science. ,vol. 37, pp. 997- 1003 ,(2002) , 10.1023/A:1014362000128
Duncan P Fagg, Vladislav V Kharton, Jorge R Frade, P-Type Electronic Transport in Ce0.8Gd0.2O2 − δ: The Effect of Transition Metal Oxide Sintering Aids Journal of Electroceramics. ,vol. 9, pp. 199- 207 ,(2002) , 10.1023/A:1023269326651
T Zhang, L Kong, Z Zeng, Haitao Huang, P Hing, Z Xia, J Kilner, None, Sintering behavior and ionic conductivity of Ce0.8Gd0.2O1.9 with a small amount of MnO2 doping Journal of Solid State Electrochemistry. ,vol. 7, pp. 348- 354 ,(2003) , 10.1007/S10008-002-0337-9
Marco Nauer, Christos Ftikos, Brian C.H. Steele, An evaluation of Ce-Pr oxides and Ce-Pr-Nb oxides mixed conductors for cathodes of solid oxide fuel cells: Structure, thermal expansion and electrical conductivity Journal of The European Ceramic Society. ,vol. 14, pp. 493- 499 ,(1994) , 10.1016/0955-2219(94)90118-X
D.P. Fagg, A.L. Shaula, V.V. Kharton, J.R. Frade, High oxygen permeability in fluorite-type Ce0.8Pr0.2O2−δ via the use of sintering aids Journal of Membrane Science. ,vol. 299, pp. 1- 7 ,(2007) , 10.1016/J.MEMSCI.2007.04.020
H AVILAPAREDES, S KIM, The effect of segregated transition metal ions on the grain boundary resistivity of gadolinium doped ceria: Alteration of the space charge potential Solid State Ionics. ,vol. 177, pp. 3075- 3080 ,(2006) , 10.1016/J.SSI.2006.08.017
D Pérez-Coll, P Núñez, JCC Abrantes, DP Fagg, VV Kharton, JR Frade, Effects of firing conditions and addition of Co on bulk and grain boundary properties of CGO Solid State Ionics. ,vol. 176, pp. 2799- 2805 ,(2005) , 10.1016/J.SSI.2005.06.023
D FAGG, V KHARTON, A SHAULA, I MAROZAU, J FRADE, Mixed conductivity, thermal expansion, and oxygen permeability of Ce(Pr,Zr)O2 − δ Solid State Ionics. ,vol. 176, pp. 1723- 1730 ,(2005) , 10.1016/J.SSI.2005.04.023
DuncanP. Fagg, VladislavV. Kharton, JorgeR. Frade, Transport in ceria electrolytes modified with sintering aids: effects on oxygen reduction kinetics Journal of Solid State Electrochemistry. ,vol. 8, pp. 618- 625 ,(2004) , 10.1007/S10008-004-0509-X
Ch. Ftikos, M. Nauer, B.C.H. Steele, Electrical conductivity and thermal expansion of ceria doped with Pr, Nb and Sn Journal of The European Ceramic Society. ,vol. 12, pp. 267- 270 ,(1993) , 10.1016/0955-2219(93)90101-V