Compositional dependence of the crystal symmetry of Eu3+-doped (SrxBa1-x)(2)CaWyMo1-yO6 phosphors - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2016

Compositional dependence of the crystal symmetry of Eu3+-doped (SrxBa1-x)(2)CaWyMo1-yO6 phosphors

M. Sletnes
  • Fonction : Auteur
T. Grande
  • Fonction : Auteur
M-A Einarsrud
  • Fonction : Auteur

Résumé

Two series of A-site and B-site Eu3+ doped (SrxBa1-x)(2)CaWyMo1-yO6 double perovskite phosphor materials were prepared via a modified Pechini sol-gel route; (SrxBa1-x)(1.96)Eu(0.02)K(0.02)CaW(y)Mo(1-)yO(6) and (SrxBa1-x)(2)Ca0.96Eu0.02Li0.02WyMo1-yO6 (x and y=0, 0.25, 0.50, 0.75, 1). The Sr/Ba ratio was the main determinant for the crystal symmetry of the series, while variation in the W/Mo ratio did influence the crystal symmetry significantly. The crystal structure evolved with Sr/Ba ratio from cubic Frn (3) over barm for x=0, via tetragonal 14/m for x=0.25, to monoclinic P2(1)/n for x >= 0.5, as verified by Rietveld refinement of X-ray diffractograms as well as by Raman spectroscopy. The reported boundaries for the compositionally induced phase transitions are in very good agreement with reported optical properties. (C) 2015 Elsevier Inc. All rights reserved.
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Dates et versions

hal-01435216 , version 1 (13-01-2017)

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Citer

M. Sletnes, J. C. Valmalette, T. Grande, M-A Einarsrud. Compositional dependence of the crystal symmetry of Eu3+-doped (SrxBa1-x)(2)CaWyMo1-yO6 phosphors. Journal of Solid State Chemistry, 2016, 233, pp.30-36. ⟨10.1016/j.jssc.2015.10.014⟩. ⟨hal-01435216⟩
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