Synthesis, characterization and luminescent properties ofSr 1-x Pb x WO 4 solid solution (x=0, 0.5 and 1)

A Hallaoui (1, 2) , A Taoufyq (1, 2) , B Bakiz (2) , F Guinneton (1) , J-C Valmalette (1) , S Villain (1) , Madjid Arab (1) , A Benlhachemi (2) , L Bazzi (2) , J-R Gavarri (1)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 Université Ibn Zohr [Agadir]

Synthesis characterization and hydrogenation behaviour of as quenched Ti 41.5+X Zr 41.5-X Ni 17 (x=0, 3.5, 11.5 and 13.5) nano quasicrystalline ribbons-Lunar Luminescence-Luminescent properties of alumina ceramics doped with chromium oxide-This content was downloaded from IP address 147.94.103.164 on 12/10 Abstract. In this work, a study of the role of chemical substitution in the properties of the solid solution Sr 1-x Pb x WO 4 (x = 0, 0.5 and 1) is presented. Polycrystalline samples were synthesized by solid state reaction at 1100°C. Using Rietveld method, the structural parameters of all samples were refined. All structures are of scheelite type Scanning electron microscopy showed that a high level of crystallization characterized the samples, with modifications in sizes and shapes depending on composition x. The Infrared and Raman spectroscopies were performed to characterize the evolution of vibrational modes with composition x. Finally, a systematic study of luminescence under X-ray and UV excitations was performed. The energies and intensities of luminescence depended on composition x and on the nature of excitations. 1. Introduction The first paragraph after a heading is not indented The scheelite tungstate crystals AWO 4 are characterized by tetragonal structures [1,2] (space group I4 1 /a), with tetrahedral oxyanions WO 4 2-and M 2+ cations forming MO 8 groups [3]. They were extensively investigated for their potential applications as laser host materials [4,5], scintillators [6,7], oxide ion conductors [8], materials for microwave applications [9] and magnetic materials [10]. The luminescent properties under different excitations of single-crystals as well as polycrystalline SrWO 4 and PbWO 4 compounds have been widely studied by several authors [11-15]. Generally, luminescence spectra of scheelite tungstate were decomposed into two main blue and green bands, and to a weaker orange-red emission: the emissions were observed with energies close to 3.0-2.8, 2.7-2.4 and 2.3-2.0 eV [16-20]. In this work we study the luminescent properties of lead and strontium tungstates Sr 1-x Pb x WO 4 for the three compositions x= 0 ; 0.5 and 1 under X-ray and UV excitations. We already published the synthesis, characterization and luminescence under X-ray excitation of Sr 1-x Pb x WO 4 and Ca 1-x Cd x WO 4 solid solutions [21-23]. Presently, we compare the luminescence responses under X-ray and UV excitations of these substituted samples.

Domaines: Chimie; Matériaux

A Hallaoui, A Taoufyq, B Bakiz, F Guinneton, J-C Valmalette, et al.. Synthesis, characterization and luminescent properties ofSr 1-x Pb x WO 4 solid solution (x=0, 0.5 and 1). IOP Conference Series: Materials Science and Engineering, 2017, 186, pp.012024. ⟨10.1088/1757-899X/186/1/012024⟩. ⟨hal-02962532⟩