Dense Oxide Ion Conducting Apatites Prepared by Spark Plasma Sintering
Dense Oxide Ion Conducting Apatites Prepared by Spark Plasma Sintering
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DOI：
10.1007/s40010-012-0004-1
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
A. Orera;P. Slater
中科院分区：
文献类型：
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作者：
A. Orera;P. Slater
本文研究了用常规等离子烧结和放电等离子烧结制备致密la8y2ge6o27磷灰石电解质的方法。对于SPS微球，还研究了起始前驱体的影响，包括通过标准固态和新的溶胶-凝胶途径制备的前驱体。结果表明，尽管晶界电导率随着烧结温度的升高而降低，但无论采用何种烧结方法或前驱体，样品的体积电导率都是相似的（≈1.5 × 10−3Scm−1at 550°C），因此传统烧结制备的样品的电导率最低。制备了Ga取代样品（La8Y2Ge5GaO26.5），并采用火花等离子烧结技术进行了烧结。这显示了与未掺杂相相似的电导率，与先前常规烧结样品的结果一致。此外，采用火花等离子烧结法制备了La9SrSi6-xGexO26.5（x= 0,3,6）系列致密球团，研究了Si/Ge对烧结和电导率的影响。所有样品都获得了相似的体积电导率，纯锗酸盐（x= 6）的晶界（因此总）电导率最高。
In this paper we present a study into the preparation of dense La8Y2Ge6O27apatite electrolytes through both conventional and spark plasma sintering (SPS). For the SPS pellets, the effect of the starting precursor was also examined to include precursors prepared via both standard solid state and a new sol gel route. The results show that similar bulk conductivities (≈1.5 × 10−3Scm−1at 550°C) were found irrespective of the sintering method/precursor, although the grain boundary conductivity decreased with increasing sintering temperature, being hence lowest for the sample prepared by conventional sintering. A Ga substituted sample (La8Y2Ge5GaO26.5) was also prepared and sintered using spark plasma sintering. This showed similar conductivities to the undoped phase in agreement with prior results on conventionally sintered samples. In addition dense pellets of the series La9SrSi6-xGexO26.5(x= 0, 3, 6) have been prepared by spark plasma sintering to study the effect of Si/Ge on the sintering and conductivity. Similar bulk conductivities were obtained for all samples, with the highest grain boundary (and hence total) conductivity observed for the pure germanate (x= 6).