Luminescent properties under X-ray excitation of Ba(1-x)PbxWO4 disordered solid solution

作者：Bakiz B^*; Hallaoui A; Taoufyq A; Benlhachemi A; Guinneton F; Villain S; Ezahri M; Valmalette J C; Arab M; Gavarri J R

来源：Journal of Solid State Chemistry, 2018, 258: 146-155.

DOI：10.1016/j.jssc.2017.10.014

• Barium-Lead tungstate
• Solid solution
• X-ray diffraction
• Rietveld analysis
• Raman spectroscopy
• Luminescence

A series of polycrystalline barium-lead tungstate Bal-xPbxWO(4) with 0 <= x <= 1 was synthesized using a classical solid-state method with thermal treatment at 1000 degrees C. These materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Raman (FT-Raman) spectroscopy. X-ray diffraction profile analyses were performed using Rietveld method. These materials crystallized in the scheelite tetragonal structure and behaved as quasi ideal solid solution. Raman spectroscopy confirmed the formation of the solid solution. Structural distortions were evidenced in X-ray diffraction profiles and in vibration Raman spectra. The scanning electron microscopy experiments showed large and rounded irregular grains. Luminescence experiments were performed under X-ray excitation. The luminescence emission profiles have been interpreted in terms of four Gaussian components, with a major contribution of blue emission. The integrated intensity of luminescence reached a maximum value in the composition range x = 0.3-0.6, in relation with distortions of crystal lattice.

• 出版日期2018-2