Correlation of crystal structure and optical properties of Ba0.97Nd0.0267Ti(1-x)WxO3 perovskite. Issue 49 (3rd August 2018)

• Record Type: Journal Article
• Authors: Raddaoui, Z.; Smiri, B.; Maaoui, A.; Dhahri, J.; M'ghaieth, R.; Abdelmoula, N.; Khirouni, K.
• Is Part Of: RSC advances. Volume 8:Issue 49(2018)
• Page Start: 27870
• Page End: 27880
• Publication Date: 2018-08-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra05302b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The Ba0.97 Nd0.0267 Ti(1− x ) W x O3 (BNT x ) pervoskite with a single phase tetragonal structure was prepared at 900 °C using the Molten salt method. Abstract : The Ba0.97 Nd0.0267 Ti(1− x ) W x O3 (BNT x ) pervoskite with a single phase tetragonal structure was prepared at 900 °C using the Molten salt method. Raman spectra, Fourier transform infrared spectra (FT-IR), absorption spectra (Vis-NIR) and photoluminescence spectra (PL) in the temperature range from 10–300 K were used to investigate the correlations between the crystal structure and the optical properties of BNT x ceramics. Raman analyses and FT-IR indicated that the W 6+ ions are incorporated sufficiently into into the BNT x lattice. The optical absorption spectra were recorded in the wavelength range of 400–1000 nm. The optical band gap ( E g ) and Urbach energy ( E u ) values were calculated from the absorption spectra. The emission spectra exhibited three prominent peaks located at 880, 1058 and 1340 nm corresponding to the 4 F3/2 → 4 I9/2, 11/2, 13/2 transition levels, respectively. They also showed a decrease in the intensity of emission spectra following the addition of W 6+ ions. This decrease is due to the slight changes in the crystal environment around Nd 3+ and the non-radiative energy transfer. According to the PL measurements, the study of power-excitation density confirmed that two photons at low energy are required to create the down-conversion (DC) emissions, implying that they may also have important applications as DC materials.