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電流馳豫法測(cè)試氧化鑭摻雜氧化鈰中氧離子遷移
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清華大學(xué) 新型陶瓷與精細(xì)工藝國(guó)家重點(diǎn)實(shí)驗(yàn)室

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51323001)


Investigation of ion transportiation using the method of current relaxation
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Tsinghua University,School of Material Science Engineering,State Key Lab of Advance Ceramics Fine Processing

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    摘要:

    本文采用甘氨酸-硝酸鹽法(GNP)合成了Ce0.65La0.35O1.825 (LDC)粉末,在1400℃下燒結(jié)10小時(shí)得到陶瓷試樣,用XRD和SEM表征了樣品的物相和表面形貌。用直流電場(chǎng)測(cè)試了試樣在不同溫度下的電流馳豫現(xiàn)象,并計(jì)算了不同溫度下試樣中遷移氧離子數(shù)目和材料直流電導(dǎo)率。結(jié)果表明,在固態(tài)電解質(zhì)材料中突然施加強(qiáng)電場(chǎng),可遷移離子基本都發(fā)生了位置偏移,但極少部分可以產(chǎn)生長(zhǎng)程遷移。隨著溫度的升高,樣品中發(fā)生遷移的氧離子數(shù)目增加,但都遠(yuǎn)小于氧空位總量。遷移氧離子數(shù)目與溫度之間滿足阿累尼烏斯公式,其遷移活化能為0.83 eV。

    Abstract:

    glycine-nitrate process (GNP) was used to synthesis Ce0.65La0.35O1.825 (LDC) powders. The samples were obtained by sintering for 10 h at 1400 ℃. The phase composition and morphology were characterized by XRD and SEM. We measured the current change with time of specimen at different temperatures and thus calculated the transferred number of ions and the DC conductivity. Almost all the mobile ions will shift around their positions, but only tiny portion can migrate through a few lattice length. The number of transferred ions increased with temperature, but far smaller than the total number of oxygen vacancies. The transferred ion number and temperature follows Arrhenius relationship with the activation energy of 0.83 eV.

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李天君,張夢(mèng)霏,劉廣華,潘偉.電流馳豫法測(cè)試氧化鑭摻雜氧化鈰中氧離子遷移[J].稀有金屬材料與工程,2020,49(2):505~509.[Tianjun Li, Mengfei Zhang, Guanghua Liu, Wei Pan. Investigation of ion transportiation using the method of current relaxation[J]. Rare Metal Materials and Engineering,2020,49(2):505~509.]
DOI：10.12442/j. issn.1002-185X. QH20190057

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  • 收稿日期:2019-04-22
  • 最后修改日期:2019-05-10
  • 錄用日期:2019-10-23
  • 在線發(fā)布日期: 2020-03-12
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