The thermal decomposition of silver (I, III) oxide: A combined XRD, FT-IR and Raman spectroscopic study
The thermal decomposition of silver (I, III) oxide: A combined XRD, FT-IR and Raman spectroscopic study
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DOI：
10.1039/b103226g
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发表时间：
2001-01-01
影响因子：
3.3
通讯作者：
Metson, JB
中科院分区：
文献类型：
--
作者：
Waterhouse, GIN;Bowmaker, GA;Metson, JB
报道了银（I，II）氧化物AgO和银（I）氧化物Ag 2 O多晶粉末的FT-IR和拉曼光谱。每种氧化物的振动光谱进行了讨论，其晶体结构，并被发现是一致的因子组分析预测。红外和拉曼光谱，结合粉末XRD，也被用来跟踪氧化银粉末在空气中的热分解。采用差示扫描量热法（DSC）和程序升温反应（TPR）进行的补充研究提供了与分解过程相关的额外信息。与先前报道的机制一致，氧化银通过两个不可逆的步骤被热还原为金属银，中间形成氧化银。在373-473 K范围内加热时，AgO转变为Ag 2 O，而该反应的产物在超过623 K的温度下保持稳定。Ag 2 O中间体在673 K完全热分解为Ag和O-2。
FT-IR and Raman spectra for polycrystalline powders of silver (I, II) oxide, AgO, and silver (I) oxide, Ag2O, are reported. The vibrational spectra for each oxide are discussed in relation to its crystal structure, and were found to be consistent with factor group analysis predictions. Infrared and Raman spectroscopy, in conjunction with powder XRD, were also used to follow the thermal decomposition of AgO powder in air. Supplementary studies employing differential scanning calorimetry (DSC) and temperature programmed reaction (TPR), provided additional information relevant to the decomposition process. In agreement with mechanisms previously reported, AgO was thermally reduced to metallic silver via two non-reversible steps, with the intermediate formation of Ag2O. The transformation of AgO to Ag2O occurred with heating in the 373-473 K region, while the product of this reaction remained stable to temperatures in excess of 623 K. Complete thermal decomposition of the Ag2O intermediate to Ag and O-2 occurred at 673 K.