Abstract
On evaporation at room temperature of an aqueous reaction mixture of Ln(III) sulfate and ethanolammonium sulfate in a molar ratio higher than 1∶16, crystal products with a waxy feel were obtained. They were identified by means of the X-ray powder diffraction patterns and it was concluded that they are isostructural. The results of elemental analysis and the mass losses by TG analysis indicated the formation of double sulfates with general formula: (HOCH2CH2NH3)4Ln2(SO4)5·4.5H2O (Ln=La, Ce, Pr or Nd)
Their thermal decompositions in static atmosphere in the temperature range from ambient up to 1173 K took place in a similar way, and mainly Ln2O2SO4 was obtained as final product. The exception was the Ce compound, which decomposed to CeO2. The double sulfates decomposed in many not well-differentiated steps. From the mass losses occurring during thermal decomposition, the mode of thermal decomposition was presumed. The X-ray powder diffraction patterns of Ln2O2SO4 (Ln=La, Pr and Nd) show that they are also isostructural.
Similar content being viewed by others
References
P. Pascal, Nouveau traite de chimie minerale, Tom 14, VII/2, Masson, Paris 1959.
L. N. Komissarova, Soedineniya redkozemel'nyh elementov. Sulfatiy, selenatiy, telluratiy, khromatiy, Nauka, Moskow 1986.
V. B. Jordanovska and J. Siftar, Thermochim. Acta, 221 (1993) 79.
V. Jordanovska and J. Siftar, Thermochim. Acta, 195 (1992) 27.
V. Jordanovska, Contributions, Mac. Sci. Arts, XIII/2 (1992) 49.
V. Jordanovska and R. Trojko, Thermochim. Acta, 228 (1993) 241.
V. Jordanovska and R. Trojko, to be published.
Powder Diffraction File, Joint Comitte on powder Diffraction Standards, International Center for Diffraction data, Swarthmore, PA, 1972.
V. Jordanovska and J. Siftar, Thermochim. Acta, 195 (1992) 21.
N. Bukovec, P. Bukovec and J. Siftar, Vestn. Slov. Kem. Drus., 22 (1975) 5.
Author information
Authors and Affiliations
Additional information
The financial support of the Ministry for Science of the Republic of Macedonia and the Ministry of the Republic of Croatia is gratefully acknowledged.
Rights and permissions
About this article
Cite this article
Jordanovska, V., Trojko, R. Synthesis, identification and thermal decomposition of double sulfates of La, Ce, Pr or Nd with ethanolammonium. Journal of Thermal Analysis 50, 785–793 (1997). https://doi.org/10.1007/BF01979208
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01979208