Temperature programmed decomposition of thorium nitrate pentahydrate

被引：18

作者：

Dash, S ^{[1
]}

Kamruddin, M ^{[1
]}

Ajikumar, PK ^{[1
]}

Tyagi, AK ^{[1
]}

Raj, B ^{[1
]}

Bera, S ^{[1
]}

Narasimhan, SV ^{[1
]}

机构：

[1] BARC Facilit, Water & Steam Chem lab, Kalpakkam 603102, Tamil Nadu, India

来源：

JOURNAL OF NUCLEAR MATERIALS | 2000年 / 278卷 / 2-3期

关键词：

D O I：

10.1016/S0022-3115(99)00261-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature programmed decomposition (TPD) of thorium nitrate pentahydrate has been studied using evolved gas analysis-mass spectrometry (EGA-MS) in the temperature range 300-1200 K. A thermogravimetric (TGA) investigation was also carried out in the same temperature range. Complexity of the TGA decomposition profile was resolved through use of EGA-MS data. The activation energies and pre-exponential factors were determined for various gas release stages from the fractional extent of decomposition plots. Residues left over after each decomposition stage were analysed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The XRD investigations revealed formation of a nanocrystalline thoria intermediate product, ultimately agglomerating to a microcrystalline phase. The XPS investigations indicated systematic alteration in the chemical environment around the thorium atom while the Th4+ oxidation state remained unchanged. This was further corroborated from the analysis of shake-up satellites of Th (4f(5/2)) spectra. The O/Th ratios for various intermediate products were also determined. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：173 / 185

页数：13

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