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AgO超細(xì)粉末的制備及銀的價(jià)態(tài)變化研究
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陜西省重點(diǎn)學(xué)科建設(shè)專項(xiàng)資金資助(101-00X902)


Preparation of Ultrafine AgO Powder and Silver Valence Change
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    摘要:

    采用臭氧氧化硝酸銀制備了高純AgO超細(xì)粉末，利用差熱法研究了AgO在不同溫度下銀的價(jià)態(tài)變化，同時(shí)采用X射線衍射、掃描電子顯微鏡和X射線光電子能譜等方法，分析了AgO粉末的物相、形貌以及不同溫度加熱后粉末中銀的價(jià)態(tài)變化。結(jié)果表明，制備的AgO超細(xì)粉末屬于單斜晶系，AgO粉末呈棒狀。AgO超細(xì)粉末經(jīng)過加熱后，其顏色發(fā)生明顯變化，且隨著加熱溫度升高，粉末中AgO含量逐漸減少，Ag2O含量先增加后減少，Ag含量逐漸增加。當(dāng)溫度高于350 ℃時(shí)，AgO全部分解，46.49%轉(zhuǎn)化為Ag2O，53.51%轉(zhuǎn)化為Ag，至400 ℃時(shí)全部分解成銀。XPS高分辨結(jié)果表明，不同粉末中氧的結(jié)構(gòu)明顯不同，反映出粉末中相的變化

    Abstract:

    High pure ultrafine AgO powder was synthesized by ozone oxidation of AgNO3. Silver valence change of AgO at different temperatures was determined by differential thermal analysis. AgO powder were also characterized by XRD, SEM and XPS to analyze the phase and morphology and the silver valence change of the powder heated at different temperatures. The results show that the crystal structure of the prepared ultrafine AgO powder belongs to monoclinic system and AgO particles are of virgulate shapes. The colour of ultrafine AgO powder changes obviously after heating. In the heating process, with increasing of the temperature, the content of AgO decreases gradually, the content of Ag2O increases firstly and then decreases and the content of Ag increases gradually. When the temperature exceeds 350 oC, AgO decompose completely, 46.49 % of which transforms into Ag2O and 53.51% transforms into Ag. And complete decomposition to Ag occurs at 400 oC. The XPS spectra of O1s on different powder surfaces are quite distinct, reflecting the lattice structure change of powder

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沈文寧,馮拉俊,孔珍珍. AgO超細(xì)粉末的制備及銀的價(jià)態(tài)變化研究[J].稀有金屬材料與工程,2011,40(11):1961~1965.[Shen Wenning, Feng Lajun, Kong Zhenzhen. Preparation of Ultrafine AgO Powder and Silver Valence Change[J]. Rare Metal Materials and Engineering,2011,40(11):1961~1965.]
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  • 收稿日期:2010-03-18
  • 最后修改日期:2010-06-22
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