International Journal of Refractory Metals and Hard Materials, ( ISI ), Volume (3), No (1), Year (2012-1) , Pages (177-179)

Title : ( Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT) )

Authors: Maryam Sadat Marashi , Jalil Vahdati Khaki , Seyed Mojtaba Zebarjad ,

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Abstract

Abstract In this research, the possibility of mechanochemical decomposition of ammonium paratungstate (APT) has been studied, and compared with thermal decomposition method. For this purpose, APT powders were milled using a planetary ball mill up to 36 hours and under air atmosphere. For thermal decomposition, APT powders were heated for 30 minutes at 300 and 450°C in air atmosphere. X-ray diffraction (XRD), differential scanning calorimeter (DSC), and thermo gravimetric analyzer (TGA) were used to study the decomposition progress, and products. The XRD results showed that APT completely decomposed to WO3 by thermal decomposition, while the final product of mechanochemical decomposition was WO3 (H2O)0.5. According to DSC and TGA results, during thermal decomposition, ammonia and water released in four steps, and leaved WO3. By mechanochemical decomposition crystal water and ammonia liberated from APT structure, but structural water of APT remained. In both methods, an X-ray amorphous phase was the intermediate product of APT decomposition.

Keywords

, Key words: Thermal decomposition; Mechanochemical decomposition; Ammonium paratungstate (APT); Differential scanning calorimeter (DSC); Thermogravimetric analysis (TGA); X, ray diffraction (XRD)
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@article{paperid:1023075,
author = {Marashi, Maryam Sadat and Vahdati Khaki, Jalil and Zebarjad, Seyed Mojtaba},
title = {Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT)},
journal = {International Journal of Refractory Metals and Hard Materials},
year = {2012},
volume = {3},
number = {1},
month = {January},
issn = {0263-4368},
pages = {177--179},
numpages = {2},
keywords = {Key words: Thermal decomposition; Mechanochemical decomposition; Ammonium paratungstate (APT); Differential scanning calorimeter (DSC); Thermogravimetric analysis (TGA); X-ray diffraction (XRD)},
}

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%0 Journal Article
%T Comparing thermal and mechanochemical decomposition of ammonium paratungstate (APT)
%A Marashi, Maryam Sadat
%A Vahdati Khaki, Jalil
%A Zebarjad, Seyed Mojtaba
%J International Journal of Refractory Metals and Hard Materials
%@ 0263-4368
%D 2012

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