Structural, vibrational and luminescence properties of the (1−x)CaWO<sub>4</sub>−xCdWO<sub>4</sub> system - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2014

Structural, vibrational and luminescence properties of the (1−x)CaWO4−xCdWO4 system

G. Nolibe
  • Fonction : Auteur

Résumé

In the present work, we investigate the structural, microstructural, vibrational and luminescence properties of the system (1−x)CaWO4−xCdWO4 with x ranging between 0 and 1. Polycrystalline samples were elaborated using a coprecipitation technique followed by thermal treatment at 1000°C. The samples were then characterized using X-ray diffraction, scanning electron microscopy, Raman spectroscopy and luminescence analyses. X-ray diffraction profile analyses using Rietveld method showed that two kinds of solid solutions Ca1−xCdxWO4 having scheelite and wolframite structures, with respectively tetragonal and monoclinic crystal cells, were observed, with a biphasic system for compositions x=0.6 and 0.7. The scanning electron microscopy experiments showed a complex evolution of morphologies and crystallite sizes as x increased. The vibration modes of Raman spectra were characteristic of composition-dependent disordered solid solutions with decreasing wavenumbers as x increased. Luminescence experiments were performed under UV-laser light irradiation. The energies of emission bands increased linearly with cadmium composition x. The integrated intensity of luminescence reached a maximum value for the substituted wolframite phase with composition x=0.8.
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hal-01872803 , version 1 (16-06-2021)

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A. Taoufyq, F. Guinneton, J-C. Valmalette, Madjid Arab, A. Benlhachemi, et al.. Structural, vibrational and luminescence properties of the (1−x)CaWO4−xCdWO4 system. Journal of Solid State Chemistry, 2014, 219, pp.127-137. ⟨10.1016/j.jssc.2014.07.017⟩. ⟨hal-01872803⟩
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