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Determination of solid state basicity of rare earth oxides by thermal analysis of their carbonates

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Abstract

Relative basicities of the rare earth oxides (M2O3) were determined from the measurement by TG - DTA of decomposition temperatures of the carbonates of Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er and Yb. From the comparison of this data with that published by Head and Holley, a sequence of basicity has been proposed for the entire range of rare earth oxides. This sequence in decreasing basicities is: La > Pr ~ Nd > Sm > Gd ~ Eu > Tb ~ Ho ~ Er > Dy ∼ Tm ∼ Yb ∼ Lu > Ce. Basicity of rare earth oxides, therefore, does not decrease progressively with an increase in atomic number.

Zusammenfassung

Die relative Basizität der Seltenerdenoxide (M2O3) wurde mittels der durch TG-DTA-Untersuchungen festgestellten Zersetzungstemperaturen der Karbonate folgender Metalle bestimmt: Ce, Pr, Sm,Eu, Gd, Tb, Dy, Ho, Er und Yb. Aufgrund eines Vergleiches der hier ermittelten Daten mit denen von Head und Holley wird für die Basizität der Seltenerdenoxide folgende Reihenfolge aufgestellt: La > Pr ∼ Nd > Sm > Gd ∼ Eu > Tb ∼ Ho ∼ Er > Dy ∼Tm∼ Yb ∼ Lu > Ce. Wie ersichtlich nimmt die Basizität der Seltenerdenoxide mit ansteigender Ordnungszahl nicht progressiv ab.

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Authors and Affiliations

  1. Csiro Division of Coal Technology, P.O. Box 136, 2113, North Ryde, N.S.W., Australia

    A. M. Maitra

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  1. A. M. Maitra
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This research forms part of a larger nationally coordinated program on natural gas conversion conducted in collaboration with the Divisions of Materials Science & Technology and Fuel Technology, and with BHP Melbourne Research Laboratories.

The author is grateful to Dr E. Patsalides of Sydney University for his generous donation of eight rare-earth oxides. The author wishes to thank the colleagues for their contribution to this work: Mr K. Riley and Mr W. Godbeer (chemical analysis), Dr P. F. Nelson and Mr R. Quezada (FTIR analysis), Mr A. Home (XRD analysis), Mr S. P. Chatfield (thermal analysis) and the project leader, Mr R. J. Tyler for his constant encouragement and valuable suggestions.

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Maitra, A.M. Determination of solid state basicity of rare earth oxides by thermal analysis of their carbonates. Journal of Thermal Analysis 36, 657–675 (1990). https://doi.org/10.1007/BF01914518

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