Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 59: Issue 3
Thermal Decompositions of Pure and Mixed Manganese Carbonate and Ammonium Molybdate Tetrahydrate
Authors:
W. Shaheen National Research Centre, Dokki Physical Chemistry Department Cairo Egypt Cairo Egypt

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M. Selim National Research Centre, Dokki Physical Chemistry Department Cairo Egypt Cairo Egypt

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Pages:
961–970
Online Publication Date:
02 Nov 2004
Publication Date:
01 Mar 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010142813033
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Abstract  

The thermal decompositions of pure and mixed manganese carbonate and ammonium molybdate tetrahydrate in molar ratios of 3:1, 1:1 and1:3 were studied by DTA and TG techniques. The prepared mixed solid samples were calcined in air at 500, 750 or 1000C and then investigated by means of an XRD technique. The results revealed that manganese carbonate decomposed in the range 300–1000C, within termediate formation of MnO2, Mn2O3 andMn3O4. Ammonium molybdate tetrahydrate first lost its water of crystallization on heating, and then decomposed, yielding water and ammonia. At 340C,MoO3 was the final product, which melts at 790C. The thermal treatment of the mixed solids at 500, 750 or 1000C led to solid-solid interactions between the produced oxides, with the formation of manganese molybdate. At 1000C, Mn2O3 and MoO3 were detected, due to the mutual stabilization effect of these oxides at this temperature.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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