Effects of In, Ta Co-doped on the Sinterability and Stability of BaCeO3

doi:10.15541/jim20160021

Abstract

Abstract:

BaCe_0.7In_0.3-_xTa_xO_3-_δ powders were synthesized by a modified citrate method. The powders were pressed into pellets, and then sintered at 1150℃, 1250℃ and 1350℃. The phase composition and the microstructure were investigated by using X-ray diffraction patterns and scanning electron microscope, respectively. The conductivity was measured by AC impedance method. The results indicate that porosities of the samples sintered at 1350℃ are less than 10% and the sample’s sinterability becomes better with the increasing doping amount of In. The doping of In can improve stability of the BaCeO₃ based powders against water, but not improve its stability against high concentration CO₂. However, Co-doping with In and Ta definitely improves the samples’ resistance against CO₂ and the higher Ta-doping level, the much more stability is, while the conductivities in wet H₂ decrease. Conductivity of the BaCe_0.7ln_0.25Ta_0.05O_3-_δ sample at 800℃ in wet 10% H₂ atmosphere reaches 1.16×10^-3S/cm.

Key words: BaCeO3, In-doping, Ta-doping, sintering activity, chemical stability

CLC Number:

TQ13

YANG Chun-Li, YAN Min, LI Wei. Effects of In, Ta Co-doped on the Sinterability and Stability of BaCeO₃[J]. Journal of Inorganic Materials, 2016, 31(9): 955-960.

Figures/Tables 9

Fig. 1 XRD patterns of the BaCeO3 powders doped with different In and Ta after being calcined at 1000℃ for 6 h (Inset is a partial enlarged patterns)

Fig. 2 Cross-sectional SEM images of BCI20T10 (a), BCI25T5 (b) and BCI30 (c) pellets sintered at 1150℃

Fig. 3 Cross-sectional SEM images of BCI20T10 (a), BCI25T5 (b) and BCI30 (c) pellets sintered at 1250℃

Fig. 4 Cross-sectional SEM images of BCI20T10 (a), BCI25T5 (b) and BCI30 (c) pellets sintered at 1350℃ while BCY (d) sintered at 1400℃

Fig. 5 Porosities of BCI20T10, BCI25T5 and BCI30 pellets sintered at different temperatures

Fig. 6 XRD patterns of BCI20T10, BCI25T5 and BCI30 pellets sintered at 1350℃ while BCY sintered at 1400℃

Fig. 7 XRD patterns of BCI20T10, BCI25T5, BCI30 and BCY powders after exposure to 100%CO2 at 700℃ for 3 h

Fig. 8 XRD patterns of BCI20T10, BCI25T5, BCI30 and BCY powders after treatment in boiling water for 3 h

Fig. 9 Arrhenius curves of BCY, BCI20T10, BCI25T5, and BCI30 at different temperatures in 10% wet H2

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Effects of In, Ta Co-doped on the Sinterability and Stability of BaCeO₃

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References 29

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