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Application of thermal treatment for the interpretation of photoluminescent centres in minerals

  • Earth Sciences
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Abstract

The influence of thermal treatments on photoluminescence spectra of several minerals has been investigated. By applying step-wise heating, new luminescence centres were detected which had been not previously recognized in the corresponding minerals. Luminsecence centres appearing as result of valence changing during oxidizing heating include:

  1. (i)

    (UO2)2+ as a result of nonluminescent U6+ transformation in zircon, barite, francolite and chert;

  2. (ii)

    Eu2+ as a result of nonluminescent Eu+ transformation in barite.

Luminescence centres which were most stable under thermal treatment were Fe3+ in zircon and Mn2+ in barite. Luminescence centres with similar spectral-kinetic properties but with different thermal stability which allowed them to be separated and properly identified were different metaloxygen complexes (MeOn)m− in zircon.

Zusammenfassung

Der Einfluß von Hitzebehandlungen auf das Photolumineszenzspektrum verschiedener Minerale wurde untersucht. Durch schrittweises Erhitzen wurde neue Lumineszenzzentren gefunden, welche in natürlichen Mineralen bisher nicht erkannt wurden. Lumineszenzzentren, die im Ergebnis der Valenzänderung bei oxidierendem Erhitzen auftreten, beinhalten

  1. (i)

    (UO2)2+ als Ergebnis der nichtlumineszenten U6+-Umwandlung in Zirkon, Baryt, Franzolit und Hornstein;

  2. (ii)

    Eu2+ als Ergebnis der nichtlumineszenten Eu+-Umwandlung in Baryt. Die bei Hitzebehandlung stabilsten Lumineszenzzentren waren Fe3+ in Zirkon und Mn2+ in Baryt. Lumineszenzzentren mit ähnlichen spektral-kinetischen Eigenschaften, aber unterschiedlicher thermischer Stabilität, was es erlaubt, sie zu trennen und entsprechend zu identifizieren, waren verschiedene (MeOn)m− Metall-Sauerstoff-Komplexe in Zirkon.

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Authors and Affiliations

  1. Geology and Physics Groups, The open University of Israel, Tel-Aviv, Israel

    M. Gaft

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  1. M. Gaft
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Gaft, M. Application of thermal treatment for the interpretation of photoluminescent centres in minerals. Journal of Thermal Analysis 40, 67–78 (1993). https://doi.org/10.1007/BF02546556

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  • DOI: https://doi.org/10.1007/BF02546556

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