Thermal transformations and infrared studies of Mn2P2O7 • 2H2O
Thermal transformations and infrared studies of Mn2P2O7 • 2H2O
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DOI：
10.1080/10426500490468137
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发表时间：
2004-07-01
影响因子：
1.3
通讯作者：
Harcharras, M
中科院分区：
文献类型：
--
作者：
Brouzi, K;Ennaciri, A;Harcharras, M
Mn2P2O7的热脱水。在 25-600℃ 范围内通过热重分析（TG-DTG 和 DSC）、X 射线衍射和红外光谱研究了 2H(2)O。根据（TG-DTG 和 DSC）曲线，该盐的脱水分两个阶段进行。该化合物在不同温度下加热的热分析、X射线图谱和红外光谱结果表明，脱水后，Mn2P2O7。 2H(2)O分解成无定形产物，在544℃结晶，得到无水二磷酸盐MN2P2O7。 Mn2P2O7 脱水的自由焓。 2H(2)O和Mn2P2O7的形成已由热重数据计算。 Mn2P2O7·2H(2)O及其加热产物的红外光谱研究揭示了P2O7基团特征带（v(as) POP和v(s) POP）的存在，并表明初始产物的POP角是弯曲的，并且在二磷酸盐Mn2P2O7中观察到线性POP桥。 Mn2P2O7 的红外光谱。 2H(2)O 已使用因子组分析进行解释。
The thermal dehydration of Mn2P2O7 . 2H(2)O was studied, in the range 25-600degreesC by thermogravimetric analysis (TG-DTG and DSC), x-ray diffraction, and infrared spectroscopy. According to the (TG-DTG and DSC) curves, the dehydration of this salt takes place in two stages. The results of thermal analysis, x-ray patterns, and infrared spectra of this compound heated, at different temperatures showed that after dehydration, Mn2P2O7 . 2H(2)O decomposes to an amorphous product which crystallizes at 544degreesC to give anhydrous diphosphate MN2P2O7. The free enthalpy of the dehydration of Mn2P2O7 . 2H(2)O and of the formationoOf Mn2P2O7 have been calculated from thermogravimetric data. The infrared spectroscopic study of Mn2P2O7 .2H(2)O and of its heated products reveals the existence of the characteristic bands of the P2O7 group (v(as) POP and v(s) POP) and showed that the POP angle is bent for the initial product and a linear POP bridge is observed in the diphosphate Mn2P2O7. The infrared spectrum of Mn2P2O7 . 2H(2)O has been interpreted using factor group analysis.