Luminescence Study of the Thermal Decomposition of Europium Trichloride Hexahydrate, EuCl3·6H2O

Author:

Stump Nathan A.1,Schweitzer George K.1,Gibson John K.1,Haire Richard G.1,Peterson Joseph R.1

Affiliation:

1. Department of Physical Sciences, Winston-Salem State University, Winston-Salem, North Carolina 27110 (N.A.S.); Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600 (G.K.S., J.R.P.); and Transuranium Research Laboratory (Chemical and Analytical Sciences Division), Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6375 (J.K.G., R.G.H., J.R.P.)

Abstract

We have studied the thermal decomposition of EuCl3·6H2O using in situ measurements of the Eu3+ ion luminescence spectrum. The luminescence spectrum proved to be extremely sensitive to structural and compositional changes undergone by the title compound during the decomposition process. There appeared to be no change in the oxidation state of the europium throughout the decomposition process. Four differently hydrated species of EuCl3· nH2O ( n = 6, 3, 2, or 1) were identified via luminescence spectroscopy. We also observed another intermediate compound formed from the monohydrate prior to the final product EuOCl. Our analysis of this intermediate's spectrum indicates a single Eu3+ ion site, which is consistent with a formulation of Eu(OH)Cl2 rather than a mixed EuOCl·2EuCl3 product, both of which have been postulated by others on the basis of their thermogravimetric measurements.

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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