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磷灰石结构电解质La_(10-x)Si_6O_(27-1.5x)的合成及电性质 被引量：2

Synthesis and conducting properties of La_(10-x)Si_6O_(27-1.5x)
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摘要 以La2O3和SiO2为原料,采用凝胶注模工艺合成了具有磷灰石结构晶相的固体电解质材料La10-xSi6O27-1.5x(x=0,0.5)。通过X射线衍射光谱法(XRD)对所得化合物的结构进行表征。在300～800℃的温度范围内,利用电化学阻抗谱详细研究了La10-xSi6O27-1.5x陶瓷的烧结温度和La元素的含量对La10-xSi6O27-1.5x电导率的影响。结果表明:陶瓷样品的烧结温度对其电导率的影响较大,La10Si6O27的电导率随着陶瓷样品烧结温度的上升而提高,1650℃烧结的La10Si6O27在800℃电导率为3.46×10-2S/cm,约是1550℃烧结样品的6倍。La9.5Si6O26.25的电导率随着陶瓷样品烧结温度上升呈先上升后下降的变化趋势,当烧结温度高于1600℃时,晶粒和晶界内有大量未知相析出,这可能是导致其电导率反而下降的直接原因。 Apatite-type La10-xSi6O27-1.5x （x=0, 0.5） was successfully synthesized by water-based gel-casting technique, using La2O3 and SiO2 as raw materials. The apatite phases were characterized by X-ray diffraction （XRD）. The effect of sintering temperature and lanthanum content on the conducting properties of La10-xSi6O27-1.5x was investigated by electrochemical impedance spectroscopy （EIS） at 300-800℃. It is found that the conductivity is significantly influenced by the sintering temperature and lanthanum content. The conductivity of La10Si6O27 is increased with the increase of sintering temperature, and the conductivity of La10Si6O27 sintered at 1 650 ℃ is 6 times higher than that of La10Si6O27 sintered at 1 550℃. However, the conductivity of La10Si6O27 increases with the increase of sintering temperature and reaches a maximum at 1 600℃, and the conductivity decreases again when the sintering temperature is higher than 1 600℃, which is due to the unknown phases formed on the samples.
作者 张兰 何洪泉 蒋三平 张玉军
机构地区 南洋理工大学机械与航天航空学院 山东大学材料科学与工程学院材料液态结构及其遗传性教育部重点实验室
出处 《电源技术》 CAS CSCD 北大核心 2009年第11期980-984,共5页 Chinese Journal of Power Sources
基金 新加坡教育部Academic Research Fund AcRF tier 2(ARC2/08)
关键词 凝胶注模工艺 磷灰石结构 电解质 电导率 固体氧化物燃料电池 gel casting apatite electrolyte conductivity solid oxide fuel cell
分类号 TM911 [电气工程—电力电子与电力传动]
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参考文献12

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同被引文献29

  • 1李锋,金江,张华.磷灰石型低温固体电解质材料的研究进展[J].硅酸盐通报,2006,25(4):137-141. 被引量：3
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电源技术
2009年 第11期

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