A comparative study on thermal behavior of solid-state light trivalent lanthanide isonicotinates in dynamic dry air and nitrogen atmospheres
Nunes, W. D. G. [UNESP]
Teixeira, J. A. [UNESP]
Nascimento, A. L. C. S. do [UNESP]
Caires, F. J. [UNESP]
Ionashiro, E. Y.
Ionashiro, M. [UNESP]
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Characterization, thermal stability, and thermal decomposition of light trivalent lanthanide isonicotinates Ln(L)(3)center dot 2H(2)O (Ln = La to Gd, except Pm; L = isonicotinate) were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), DSC, infrared spectroscopy (FTIR), evolved gas analysis by TG-DSC coupled to FTIR, elemental analysis, and complexometry. The dehydration of these compounds occurs in a single step, and the thermal decomposition of the anhydrous compounds occurs in one or two (air) and two or three steps (N-2). The final residues of thermal decomposition were CeO2, Pr6O11, and Ln(2)O(3) (Ln = La, Nd to Gd) in air atmosphere, while in N-2 atmosphere the mass loss is still being observed up to 1000 A degrees C. The results also provided information concerning the gaseous products evolved during the thermal decomposition in dynamic dry air and nitrogen atmospheres.
Lanthanide isonicotinates, Thermal behavior, Evolved gas analysis
Journal Of Thermal Analysis And Calorimetry. Dordrecht: Springer, v. 125, n. 1, p. 397-405, 2016.