TG, DTA, FTIR and raman spectral analysis of Zna/Mgb ammonium sulfate mixed crystals

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DOIResolve DOI: http://doi.org/10.1023/B:JTAN.0000042160.82063.c4
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TypeArticle
Journal titleJournal of Thermal Analysis and Calorimetry
Volume78
Issue1
Pages125133; # of pages: 9
SubjectFTIR and raman spectra, DTA, TG, Zna/Mgb ammonium sulfate mixed crystals
AbstractTo understand the structural and thermal properties of the mixed crystals, thermogravimetric (TG) and differential thermal analysis (DTA), and FTIR and Raman spectral studies were carried out for the mixed crystals of Zna/Mgb ammonium sulfate of composition namely ?a' (fraction by weight of salt Zn[NH4]2[SO4]2.6H2O to the total salt (both Zn[NH4]2[SO4]2.6H2O, Mg[NH4]2[SO4]2.6H2O or it can be explained as ZnaMgb[NH4]2[SO4]2.6H2O, a + b =1), and a = 0.1, 0.25, 0.333, 0.5, 0.666, 0.75 and 0.9 grown by a solution technique. From the correlation and analysis of the results obtained for the various crystals, the desolvation, decomposition, crystalline transition phenomena were identified. By close comparison of the endotherms, obtained for the various crystals, it was found that isomorphous substitution takes place in the crystals. Up to 0.5, Zn2+ ion replaces isomorphous Mg2+ ions in the lattice sites of Mg[NH4]2[SO4]2.6H2O and above 0.5, Mg2+ ions occupies the Zn2+ ion in the lattice sites of Zn[NH4]2[SO4]2.6H2O. Both crystals belong to monoclinic system with P 2(1)/a symmetry. The vibrations of NH4+ ion, SO42- ion, the complex [Mg(OH2)6]2+ the complex [Zn(OH2)6]2+ and thethree different water molecules are identified. The linear distortion of SO42- ion is found to be greater than its angular distortion, while the NH4+ ion has suffered more angular distortion. The possibility of free rotation of the NH4+ ion is ruled out.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number47320
16517
NPARC number20377108
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Record identifier78277f8e-577c-4dfe-924c-3182e7a8215a
Record created2012-07-24
Record modified2016-05-09
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