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熔鹽法制備Ba1-xKxBiO3超導(dǎo)體及Ba0.6K0.4BiO3的穩(wěn)定性
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Preparation of Ba1-xKxBiO3 by Molten Salt Method and Thermostability of Ba0.6K0.4BiO3
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2007 Innovation Fund for Ph.D. Student of Southwest Jiaotong University and China National Funds for Distinguished Young Scientists（50588201）

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    摘要:

    利用熔鹽法在260 °C的低溫下制備出了單相Ba1-xKxBiO3 (BKBO, 0.315￡x￡0.6)樣品。磁性測量結(jié)果表明，在x值整個范圍內(nèi)的BKBO樣品都表現(xiàn)出超導(dǎo)電性，x=0.4時，超導(dǎo)轉(zhuǎn)變溫度達(dá)到最高值（Tc=30.6 K）；粉末X射線衍射結(jié)果表明，所有樣品中均含有少量的BaCO3雜相，它是由于反應(yīng)過程中Ba(OH) 2·8H2O和空氣中的二氧化碳反應(yīng)造成的；掃描電鏡觀察BKBO微觀形貌為片狀。為與熔鹽法作比較，利用溶膠-凝膠法制備Ba0.6K0.4BiO3，發(fā)現(xiàn)此法難以制備出單相BKBO樣品。利用熱分析和退火處理來研究熔鹽法制備Ba0.6K0.4BiO3的熱穩(wěn)定性，發(fā)現(xiàn)樣品大約在400 °C開始分解，表明Ba0.6K0.4BiO3在400 °C以上是不穩(wěn)定的。

    Abstract:

    Ba1-xKxBiO3 (BKBO) samples with 0.315 ￡ x ￡ 0.6 were synthesized at a relatively low temperature of 260 °C by molten salt method. The superconductivity was tested in the whole range of x value, the highest superconducting transition temperature Tc = 30.6 K at x = 0.4. X-ray Diffraction patterns reveal that small amount of impurity phase of BaCO3 were detected in BKBO which is attributed to the reactions between Ba(OH)2·8H2O and CO2 in air. The plate-like morphology of BKBO was observed from SEM images. For comparison, sol-gel method was also used in synthesizing Ba0.6K0.4BiO3 sample, but no single phase of BKBO was obtained. For the sample of Ba0.6K0.4BiO3 prepared by molten salt method, the thermostability was investigated by thermo- gravimetric analysis (TGA) and annealing treatment, and the sample was decomposed at 400 °C . The result showed that Ba0.6K0.4BiO3 was thermally unstable above 400 °C.

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崔雅靜,陳永亮,王法社,李 璟,張 勇,趙 勇.熔鹽法制備Ba1-xKxBiO3超導(dǎo)體及Ba0.6K0.4BiO3的穩(wěn)定性[J].稀有金屬材料與工程,2009,38(4):583~586.[Cui Yajing, Chen Yongliang, Wang Fashe, Li Jing, Zhang Yong, Zhao Yong. Preparation of Ba1-xKxBiO3 by Molten Salt Method and Thermostability of Ba0.6K0.4BiO3[J]. Rare Metal Materials and Engineering,2009,38(4):583~586.]
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  • 收稿日期:2008-04-22
  • 最后修改日期:2009-02-17
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