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自蔓延高溫合成La1-xSrxMnO3過程中雜質(zhì)產(chǎn)生原因的熱力學(xué)分析
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TQ174.75

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國家自然科學(xué)基金資助項目（50602051）;中國博士后科學(xué)基金資助項目（2004036425）


Thermodynamic Study of Impurity Forming in Preparing La1-xSrxMnO3 by Self-Propagating High-Temperature Synthesis Method
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    摘要:

    熱力學(xué)計算和實驗分析相結(jié)合，分析了自蔓延高溫合成La1-xSrxMnO3過程中雜質(zhì)產(chǎn)生的原因并給出了消除雜質(zhì)的方法。結(jié)果表明：當(dāng)采用Mn02稀釋劑時，由于生成La2SrO4的吉布斯自由能與生成SrMnO3的自由能相當(dāng)，自蔓延高溫合成產(chǎn)物中容易生成La2SrO4雜質(zhì)相，采用La1-xSrxMnO3作稀釋劑，可以避免La2SrO4的產(chǎn)生；當(dāng)稀釋劑較多時，合成產(chǎn)物中容易產(chǎn)生Mn3O4雜質(zhì)相，消除的方法是控制稀釋劑添加量，控制自蔓延反應(yīng)速度和體系溫度。

    Abstract:

    Through thermodynamic calculation and experiment analysis, the cause of impurity forming in preparing La1-xSrxMnO3 by self-propagating high-temperature synthesis (SHS) was studied and the suggestion was given in this paper to avoid or diminish it. The results show that La2SrO4 impurity was produced inevitably in the products synthesized by SHS because the Gibbs free energy of La2SrO4 forming reaction is equivalent to that of SrMnO3 forming reaction when MnO2 was adopted as dilution. When La1-xSrxMnO3 was used as dilution, La2SrO4 forming could be avoided. The over-dilution of La1-xSrxMnO3 resulted in Mn3O4 impurity forming, which could be avoided by adjusting the proportion of dilution and controlling the reaction speed and system temperature of SHS process.

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祝寶軍 陶穎 貢濤 唐元洪 王平.自蔓延高溫合成La1-xSrxMnO3過程中雜質(zhì)產(chǎn)生原因的熱力學(xué)分析[J].稀有金屬材料與工程,2007,36(3):513~516.[Zhu Baojun, Tao Ying, Gong Zao, Tang Yuanhong, Wang Ping. Thermodynamic Study of Impurity Forming in Preparing La1-xSrxMnO3 by Self-Propagating High-Temperature Synthesis Method[J]. Rare Metal Materials and Engineering,2007,36(3):513~516.]
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  • 最后修改日期:2006-01-12
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