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稀土離子半徑對稀土鋯酸鹽的組織結(jié)構(gòu)和電學性能的影響
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中國科學院青島生物能源與過程研究所

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中圖分類號:

TB321

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國家自然科學基金項目（面上項目），山東省自然科學基金（青年基金）


Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics
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Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences

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    摘要:

    采用X射線衍射、高分辨透射電鏡、選區(qū)電子衍射、拉曼光譜以及阻抗譜等手段研究了稀土鋯酸鹽（A2Zr2O7）材料的晶體結(jié)構(gòu)和電學性能，發(fā)現(xiàn)稀土鋯酸鹽A2Zr2O7的有序度隨稀土陽離子半徑的減小逐漸降低。Sm2Zr2O7和Eu2Zr2O7陶瓷為有序的燒綠石相，而Gd2Zr2O7和Dy2Zr2O7為無序的缺陷型螢石相。與其它幾種稀土鋯酸鹽的電導率相比，有序度相對較低的燒綠石相Eu2Zr2O7具有最大的晶粒電導率(1.03?10–2S?cm–1, 1173K)。

    Abstract:

    The microstructure and electrical conductivity of A2Zr2O7 ceramic have been investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) coupled with selected area electron diffraction (SAED), Raman spectroscopy and Impedance spectroscopy. The results show that the degree of structural order of rare-earth zirconates A2Zr2O7 ceramics gradually decreases with decreasing ionic radius of rare-earth cations. The Sm2Zr2O7 and Eu2Zr2O7 ceramics exhibit an ordered pyrochlore phase, while Gd2Zr2O7 and Dy2Zr2O7 ceramics have a disordered fluorite phase. Pyrochlore-type Eu2Zr2O7 ceramic with a relatively low structural order degree shows the maximum grain conductivity of 1.03?10–2S?cm–1 at 1173K, as compared with that of the other rare-earth zirconates.

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夏校良.稀土離子半徑對稀土鋯酸鹽的組織結(jié)構(gòu)和電學性能的影響[J].稀有金屬材料與工程,2016,45(8):2003~2008.[xiaxiaoliang. Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics[J]. Rare Metal Materials and Engineering,2016,45(8):2003~2008.]
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  • 收稿日期:2013-07-23
  • 最后修改日期:2016-04-14
  • 錄用日期:2016-04-26
  • 在線發(fā)布日期: 2016-10-09
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