Thermal decomposition of gallium nitrate hydrate Ga(NO3)3•xH2O

被引：49

作者：

Berbenni, V ^{[1
]}

Milanese, C ^{[1
]}

Bruni, G ^{[1
]}

Marini, A ^{[1
]}

机构：

[1] Univ Pavia, Dipartimento Chim Fis, CSGI, CNR,IENI, I-27100 Pavia, Italy

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2005年 / 82卷 / 02期

关键词：

dehydration; gallium nitrate hydrate; thermal decomposition; thermogravimetric analysis;

D O I：

10.1007/s10973-005-0909-x

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermal decomposition of gallium nitrate hydrate (Ga(NO3)(3)center dot xH(2)O) to gallium oxide has been studied by TG/DTG and DSC measurements performed at different heating rates. It is concluded that 8 water molecules are present in the hydrate compound. The anhydrous gallium nitrate does not form at any temperature as the reaction consists of coupled dehydration/decomposition processes that occur with a mechanism dependent on heating rate. TG measurements performed with isothermal steps (between 31 and 115 degrees C) indicate that Ga(OH)(2)NO3 forms in the first stage of the reaction. Such a compound undergoes further decomposition to Ga(OH)(3) and Ga(NO3)O, compounds that then decompose respectively to Ga(OH)O and finally to Ga2O3 and directly to Ga2O3. Diffuse reflectance Fourier transform IR spectroscopy (DRIFTIR) has been of help in assessing that the reaction consists of parallel dehydration/decomposition processes.

引用

页码：401 / 407

页数：7

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