利用固相合成法制备了Ba1-x Lax Co0．9 Nb0．1 O3-δ(x＝0~0．3)透氧膜材料.研究发现,La 的掺杂虽然降低了材料的透氧率,但使得相结构更加稳定.分析结果表明,BaCo0．9 Nb0．1 O3-δ在较低工作温度下透氧率的衰减是由相分解所致. La 的掺杂能够减小容差因子,有利于立方相的形成和稳定,并有效改善透氧率衰减问题.Ba0．9 La0．1 Co0．9 Nb0．1 O3-δ在850℃、Air/He条件下表现出稳定的高透氧率,达到1．75 mL/(cm2?min).
Ba1-xLaxCo0.9Nb0.1O3-δ(x=0-0.3)membranes were synthesized through conventional solid-phase re-action.Although the raise of La doping level sacrifices the oxygen permeability,the phase stability of cubic per-ovskite structure was effectively improved.The material characterizations indicate that the degradation behavior of BaCo0.9 Nb0.1 O3-δwas attributed to the phase decomposition of cubic structure.The introduction of La decrea-ses the tolerance factors and successfully solves the problem of oxygen flux degradation.Impressively high and long-term stable oxygen flux as high as 1.75 mL/(cm2?min)was obtained through 1 mm Ba0.9 La0.1 Co0.9 Nb0.1 O3-δmembrane at 850 ℃ under air/He gradient.
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