Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 100: Issue 1

Some thermodynamic functions and kinetics of thermal decomposition of NH4MnPO4 · H2O in nitrogen atmosphere

Authors:
,
Chanaiporn Danvirutai Khon Kaen University Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science Khon Kaen 40002 Thailand

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Pittayagorn Noisong Khon Kaen University Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science Khon Kaen 40002 Thailand

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Sujittra Youngme Khon Kaen University Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science Khon Kaen 40002 Thailand

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Pages:
117–124
Online Publication Date:
10 Jun 2009
Publication Date:
01 Apr 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0017-4
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Abstract  

The ammonium manganese phosphate monohydrate (NH4MnPO4 · H2O) was found to decompose in three steps in the sequence of: deammination, dehydration and polycondensation. At the end of each step, the consecutive one started before the previous step was finished. The thermal final product was found to be Mn2P2O7 according to the characterization by X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy. Vibrational frequencies of breaking bonds in three stages were estimated from the isokinetic parameters and found to agree with the observed FTIR spectra. The kinetics of thermal decomposition of this compound under non-isothermal conditions was studied by Kissinger method. The calculated activation energies Ea are 110.77, 180.77 and 201.95 kJ mol−1 for the deammination, dehydration and polycondensation steps, respectively. Thermodynamic parameters for this compound were calculated through the kinetic parameters for the first time.

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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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