EL ABED, Ahmed; MESNAOUI, Mohamed; MAAZAZ, Mohamed; PARENT, Claude; LE FLEM, Gilles

doi:10.1016/S0022-4596(02)00165-2

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EL ABED, Ahmed
Laboratoire de Chimie du Solide Minéral

MESNAOUI, Mohamed
Laboratoire de Chimie du Solide Minéral

MAAZAZ, Mohamed
Laboratoire de Chimie du Solide Minéral

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Journal of Solid State Chemistry. 2003, vol. 170, n° 2, p. 450-457

Elsevier

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Crystalline and glassy K1−xTlxZn(PO3)3 polyphosphates have been synthesized and characterized. UV–visible spectroscopy was systematically used in order to analyze the optical properties of Tl+ ions both in crystalline and glassy forms with the similar compositions. The investigated polyphosphates can be considered as a model system since the spectroscopic properties of Tl+ ions in the glasses could be deduced by comparison with those in crystals. From structural point of view, in the crystalline forms the thallium ions are six-fold coordinated in a dissymmetrical oxygenated sites. Three luminescences (α, AX, AT) have been then observed and were attributed to the isolated Tl+ ions. In the glassy forms, an additional luminescence (D) has been detected in the low-energy range and was assigned to the Tl+ pairs formation. The relationship between the Tl+ site symmetry and its optical properties is discussed in the context of the Fukuda's model.< Réduire

Mots clés

Glasses

Phosphates

Tl+ luminescence

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Luminescent properties of the potassium zinc phosphates of composition K1−xTlxZn(PO3)3

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