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首页> 外文会议>Fourth International Symposium on Ionic and Mixed Conducting Ceramics, null >La(Sr)Ga(Fe)O_3 PEROVSKITE OXIDE AS A NEW MIXED CONDUCTOR FOR AN OXYGEN PERMEATING MEMBRANE
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La(Sr)Ga(Fe)O_3 PEROVSKITE OXIDE AS A NEW MIXED CONDUCTOR FOR AN OXYGEN PERMEATING MEMBRANE

机译：La（Sr）Ga（Fe）O_3钙钛矿氧化物作为透氧膜的新型混合导体

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The oxygen permeating property of Fe doped LaGaO_3 based perovskite oxide was investigated in this study. Fe doped La_(1-x)Sr_xGaO_3 exhibits very high total conductivity (～1 S/cm) and high oxygen permeation rate. In particular, the highest total conductivity and the highest oxygen permeating rate were obtained for the composition, La_(0.7)Sr_(0.3)Ga_(0.6)Fe_(0.4)O_3 (LSGF). At this composition, the oxygen permeation rate from air to He was as high as 2.5cc/min'cm~2 at 1273 K and 0.3 mm membrane thickness. The application of LSGF membrane for the CH_4 partial oxidation was further studied. Since the P_(o2) gradient is large, the oxygen permeation rate drastically increased and attained a value of 12 cc/min.cm~2 at 1273 K for 0.36 mm thickness. Electronic conductivity in LSGF was further investigated by polarization methods. Electronic hole conduction was observed in LSGF and the oxide ion conductivity estimated by the polarization method was as high as 0.6 Scm~(-1). Electronic hole conduction decreased with decreasing P_(o2) with a P_(o2)~(1/4) The electron hole conductivity was independent of P_(o2) in the range of P_(o2) =0.21-10~(-7) atm. Therefore, at high P_(o2)(>10~(-5) atm), the main defect in LSGF is O_i and Fe_(Fe) and .at intermediate P_(o2) (10~(-15)～10~(-5) atm), concentration of Fe_(Fe)' is balanced by that of O_i". The estimated transport number of oxide ion was ca. 0.6 ( for Po2=10~(-8)～10~(-2) atm) which is in good agreement with that estimated by the electromotive force in a H2-O_2 gas concentration cell.
机译：本研究研究了掺Fe的LaGaO_3基钙钛矿氧化物的透氧性能。 Fe掺杂的La_（1-x）Sr_xGaO_3具有很高的总电导率（〜1 S / cm）和高的氧渗透率。特别地，对于组合物La_（0.7）Sr_（0.3）Ga_（0.6）Fe_（0.4）O_3（LSGF）获得了最高的总电导率和最高的氧气渗透速率。在该组成下，在1273 K和0.3 mm的膜厚度下，从空气到He的氧气渗透率高达2.5cc / min'cm〜2。进一步研究了LSGF膜在CH_4部分氧化中的应用。由于P_（o2）的梯度大，氧气渗透率急剧增加，在厚度为0.36 mm的情况下，在1273 K时氧气渗透率达到12 cc / min.cm〜2。通过极化方法进一步研究了LSGF中的电导率。在LSGF中观察到电子空穴传导，并且通过极化方法估计的氧化物离子传导性高达0.6Scm〜（-1）。电子空穴传导率随着P_（o2）〜（1/4）的降低P_（o2）而降低电子空穴传导率在P_（o2）= 0.21-10〜（-7）范围内与P_（o2）无关atm。因此，在高P_（o2）（> 10〜（-5）atm）时，LSGF的主要缺陷是O_i和Fe_（Fe），而在中等P_（o2）（10〜（-15）〜10〜（ -5）atm），Fe_（Fe）'的浓度与O_i“的浓度平衡。估计的氧化物离子迁移数约为0.6（对于Po2 = 10〜（-8）〜10〜（-2）atm ）与通过H2-O_2气体浓缩池中的电动势估算的结果非常吻合。

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