In、Ta共掺对BaCeO3烧结性能及稳定性的影响

doi:10.15541/jim20160021

摘要/Abstract

摘要：

采用改进的柠檬酸盐法制备了不同In、Ta掺杂量的BaCeO₃基质子导体粉体, 干压成型后分别在1150℃、1250℃和1350℃下进行烧结。采用X射线衍射仪、扫描电镜分别对质子导体的物相结构和微观形貌进行了表征, 并采用电化学工作站测定了样品不同温度下的电导率。结果表明, 1350℃烧结样品气孔率均小于10%, 并且In掺杂量越高越容易烧结。样品在CO₂和H₂O中的化学稳定性测试结果表明, 只掺杂In可以提高样品在水中的化学稳定性, 但是对粉末样品高浓度CO₂气氛下的稳定性影响不大。In、Ta共掺杂可以大幅度提高样品在CO₂中的稳定性, 且稳定性随着Ta掺杂量的增加而提高。但是样品在10%湿润氢气气氛下的电导率随着Ta含量的增加而降低, 其中, BaCe_0.7In_0.25Ta_0.05O_3-_δ在800℃时湿氢气下的电导率为1.16×10^-3 S/cm。

关键词: BaCeO3, In掺杂, Ta掺杂, 烧结活性, 化学稳定性

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

中图分类号:

TQ13

杨春利, 严敏, 李伟. In、Ta共掺对BaCeO₃烧结性能及稳定性的影响[J]. 无机材料学报, 2016, 31(9): 955-960.

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.

图/表 9

图1 在1000℃煅烧6h后不同In、Ta掺杂量BaCeO3粉体的XRD图谱(插图为局部放大图)

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)

图2 经过1150℃烧结后BCI20T10(a)、BCI25T5(b)、BCI30(c)的断面扫描电镜照片

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

图3 经过1250℃烧结后BCI20T10(a)、BCI25T5(b)、BCI30(c)的断面扫描电镜照片

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

图4 在1350℃烧结后BCI20T10(a)、BCI25T5(b)、BCI30(c)及在1400℃烧结后BCY(d)的断面扫描电镜照片

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

图5 在不同温度烧结后BCI20T10、BCI25T5和BCI30薄膜的气孔率

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

图6 在1350℃烧结后BCI20T10、BCI25T5、BCI30和在1400℃烧结后BCY的XRD图谱

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

图7 在100% CO2、700℃处理3 h后BCI20T10、BCI25T5、BCI30和BCY粉体的XRD图谱

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

图8 在水中处理3 h后BCI20T10、BCI25T5、BCI30和BCY粉体的XRD图谱

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

图9 10%H2湿润气氛下BCY、BCI20T10、BCI25T5、BCI30在不同温度的Arrhenius曲线

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

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In、Ta共掺对BaCeO₃烧结性能及稳定性的影响

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

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