Abstract
Four complexes of rare earth bromides with amino acids, REBr3·3L·3H2O (RE=La, Nd;L=glycine or alanine) were prepared and characterized by means of chemical analysis, elemental analysis, molar conductivity, thermogravimetry, IR spectra and X-ray diffraction. Their thermal decomposition kinetics from ambient temperature to 500°C were studied by means of TG-DTG techniques under non-isothermal conditions. The kinetic parameters (activation energyE and pre-exponential constantA) and the most probable mechanisms of thermal decomposition were obtained by using combined differential and integral methods. The thermal decomposition processes of these complexes are distinguished as being of two different types, depending mainly on the nature of the amino acid.
Zusammenfassung
Vier Komplexe von Seltenerdenbromiden mit Aminosäuren, REBr3·3L·3H2O= (RE=La, Nd;L=Glycin oder Alanin) wurden hergestellt und mittels chemischer Analyse, Elementaranalyse, molarer Leitfähigkeit, Thermogravimetrie, IR-Spektren und Röntgendiffraktion charakterisiert. Mittels TG-DTG wurde unter nichtisothermen Bedingungen im Temperaturbereich Raumtemperatur bis 500°C die Kinetik ihrer thermischen Zersetzung untersucht. Unter Einsatz kombinierter Integrations- und Differentialmethoden erhielt man die kinetischen Parameter, namentlich die AktivierungsenergieE, den präexponentiellen FaktorA sowie den wahrscheinlichsten Mechanismus der thermischen Zersetzung. Die Untersuchungen zeigen, daß die thermischen Zersetzungsprozesse dieser Komplexe—je nach Art der Aminosäure—zwei Typen angehören.
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Sun, T., Zhao, Y., Jin, J. et al. Thermal decomposition kinetics of lanthanum and neodymium bromide complexes with glycine or alanine. Journal of Thermal Analysis 45, 317–327 (1995). https://doi.org/10.1007/BF02548696
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DOI: https://doi.org/10.1007/BF02548696