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

• Published in: Journal of solid state chemistry Vol. 258; pp. 146 - 155
• Main Authors: Bakiz, B., Hallaoui, A., Taoufyq, A., Benlhachemi, A., Guinneton, F., Villain, S., Ezahri, M., Valmalette, J.-C., Arab, M., Gavarri, J.-R.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.02.2018; Elsevier
• Subjects: Barium-Lead tungstate; Chemical Sciences; Luminescence; Physics; Raman spectroscopy; Rietveld analysis; Solid solution; X-ray diffraction; Barium-Lead tungstate; X-ray diffraction; Solid solution; Raman spectroscopy; Rietveld analysis; Luminescence
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2017.10.014

A series of polycrystalline barium-lead tungstate Ba1-xPbxWO4 with 0 ≤ x ≤ 1 was synthesized using a classical solid-state method with thermal treatment at 1000°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. System Ba1−xPbxWO4(0 ≤ x ≤ 1). Correlation between disordered structure and luminescence under X-ray excitation. Left: Structural disorder from Raman spectra. Right: maximum of luminescence under X-ray excitation. [Display omitted] •Ba(1−x)PbxWO4 compounds are elaborated from a two-step solid state route.•X-ray diffraction and Rietveld method characterize disorder of solid solution.•Raman spectroscopy confirms the structural disorder of Ba(1−x)PbxWO4 compounds.•Luminescence under X-ray excitation characterizes the solid solution.•Luminescence intensity reaches a maximum for composition x = 0.5.