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Thermoluminescence, fluorescence and electron paramagnetic resonance properties of synthetic hydrothermal scheelites

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Abstract

Hydrothermal scheelite was synthesized using Na2WO4 · 2 H2O mixed with CaCl2 · H2O, CaSO4 · 2 H2O or CaF2 at different temperatures (270–720° C) and 108 Pa. The morphology of the crystals depends on the starting products. The observed faces include the {112}, {114}, {011}, and {013} forms. Pure or REE doped scheelites were studied by thermoluminescence (TL), fluorescence and electron paramagnetic resonance (EPR). The main TL peaks are located near 88, 149, 216, 277, and 315 K. Results obtained with EPR or optical fluorescence have been correlated with TL measurements and show that the trivalent lanthanide elements substitute for calcium ions without site distortion. The differences in TL observed between Eu and the other doping elements are related to the greater stability of Eu2+ caused by X-irradiation.

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Authors and Affiliations

  1. Laboratoire de Géologie-Géochimie, Université de Nice, E.R.A. C.N.R.S., 888, Parc Valrose, 06034, Nice-Cedex, France

    R. Caruba

  2. Laboratoire de Physique Expérimentale, Université de Nice, Parc Valrose, 06034, Nice-Cedex, France

    P. Iacconi

  3. Laboratoire de Minéralogie-Cristallographie Universités de Paris 6 et 7, Tour 16, L.A. C.N.R.S. 09, 4, Place Jussieu, 75230, Paris-Cedex 05, France

    J. F. Cottrant & G. Calas

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  1. R. Caruba
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  2. P. Iacconi
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  3. J. F. Cottrant
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  4. G. Calas
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Caruba, R., Iacconi, P., Cottrant, J.F. et al. Thermoluminescence, fluorescence and electron paramagnetic resonance properties of synthetic hydrothermal scheelites. Phys Chem Minerals 9, 223–228 (1983). https://doi.org/10.1007/BF00311959

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  • DOI: https://doi.org/10.1007/BF00311959

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