Journal of Thermal Analysis and Calorimetry

, Volume 90, Issue 2, pp 385–392 | Cite as

Structural and thermal studies on the solid products in the system MnSeO3-SeO2-H2O

Regular papers Material Science/Geosciences


The solubility of MnSeO3-SeO2-H2O system was studied in the temperature region 25–300°C. The compounds of the three-component system were identified by the Schreinemaker’s method. The phase diagram of manganese(II) selenites was drawn and the crystallization fields for the different phases were determined. Depending on the conditions for hydrothermal synthesis, MnSeO3·H2O, MnSeO3·3/4H2O, MnSeO3·l/3H2O and MnSe2O5 were obtained. The different phases were proven and characterized by chemical, powder X-ray diffraction and thermal analyses, as well as IR spectroscopy. The kinetics of dehydration and decomposition of MnSeO3·H2O was studied under non-isothermal heating. Based on 4 calculation procedures and 27 kinetic equations, the values of activation energy and pre-exponential factor in Arrhenius equation were calculated for both processes.


hydrothermal synthesis IR spectroscopy manganese(II) selenites non-isothermal kinetic powder X-ray diffraction solubility diagrams thermal analyses 


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© Springer Science+Business Media LLC 2007

Authors and Affiliations

  1. 1.Department of Physical ChemistryAssen Zlatarov UniversityBourgasBulgaria

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