Sintering and electric conductivity of (Fe,Mn,Sm) codoped CeO2-δ
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Two ceria-based samples, Sm0.1Ce0.9O2 (ST00) and Fe0.005Mn0.005Sm0.09Ce0.9O2 (S9HH) were synthesized by EDTA-citratemethod to achieve molecular-scale homogeneity. The solubility limits of the (Fe, Mn) dopants were determined by quantitativeX-ray diffraction (QXRD). The microstructure of samples after sintering were analyzed by SEM and TEM. The conductivitywas measured by 2-probe DC and AC impedance methods. The results showed no solubility limit of Mn and Fe with 5-9 mol%Sm in CeO2. Two ceria-based samples, ST00 and S9HH could be densified at 1,500 oC and 1,250 oC respectively in 1 h to fulldensity. The electrical conductivity results showed that densified 9HH performed higher electrical conductivity at 800 oC, i.e. 7.15 x 10^-2 S·cm^-1 with an ionic transference ratio (ti) 0.76 at 600 oC. Sm-segregation near grain boundary was found in SDC,but amorphous submicron-domains in (Fe, Mn, Sm) co-doped grains were responsible for the ease of the sintering at 1,250 oC.
Abstract
Two ceria-based samples, Sm0.1Ce0.9O2 (ST00) and Fe0.005Mn0.005Sm0.09Ce0.9O2 (S9HH) were synthesized by EDTA-citratemethod to achieve molecular-scale homogeneity. The solubility limits of the (Fe, Mn) dopants were determined by quantitativeX-ray diffraction (QXRD). The microstructure of samples after sintering were analyzed by SEM and TEM. The conductivitywas measured by 2-probe DC and AC impedance methods. The results showed no solubility limit of Mn and Fe with 5-9 mol%Sm in CeO2. Two ceria-based samples, ST00 and S9HH could be densified at 1,500 oC and 1,250 oC respectively in 1 h to fulldensity. The electrical conductivity results showed that densified 9HH performed higher electrical conductivity at 800 oC, i.e. 7.15 x 10^-2 S·cm^-1 with an ionic transference ratio (ti) 0.76 at 600 oC. Sm-segregation near grain boundary was found in SDC,but amorphous submicron-domains in (Fe, Mn, Sm) co-doped grains were responsible for the ease of the sintering at 1,250 oC.
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