Morphology, UV–visible and ellipsometric studies of sodium lithium orthovanadate

• Published in: Optical and quantum electronics Vol. 51; no. 9; pp. 1 - 19
• Main Authors: Enneffati, Marwa, Rasheed, Mohammed, Louati, Bassem, Guidara, Kamel, Barillé, Régis
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2019; Springer Nature B.V; Springer Verlag
• Subjects: ABSORPTION; Absorption spectra; ABSORPTION SPECTROSCOPY; ATOMIC FORCE MICROSCOPY; ATOMS; Characterization and Evaluation of Materials; Charge transfer; Computer Communication Networks; Electrical Engineering; ELLIPSOMETERS; ELLIPSOMETRY; IMPURITIES; INFRARED SPECTRA; Lasers; LIGANDS; Lithium; Microscopy; MORPHOLOGY; NANOSCIENCE AND NANOTECHNOLOGY; Optical Devices; Optical properties; Optics; PELLETS; Photonics; Physics; Physics and Astronomy; Reflectance; REFLECTIVITY; SCANNING ELECTRON MICROSCOPY; Spectroellipsometry; Spectrum analysis; TEMPERATURE RANGE 0273-0400 K; VANADATES; VANADIUM; Visible spectrum; X RADIATION; X ray powder diffraction; X-RAY DIFFRACTION; Na; UV–visible; CdVO; x = 0.5, 1; EDS; Ellipsometer; AFM; X-ray analysis; SEM; Li
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-019-2015-5

Sodium lithium orthovanadates were prepared by the classic ceramic method technique. Structure, phase purity, composition, and morphology were characterized by X-ray powder diffraction, infrared spectroscopy, energy dispersive spectroscopy, scanning-electron microscopy and atomic force microscopy. The optical properties of Na x Li 1−x CdVO 4 (x = 0.5, 1) compounds prepared were recorded at room temperature using ultra-visible and ellipsometric spectroscopies in the spectral range (200–800) nm. The average reflectance of the pellets showed high reflectivity (over 80%) in the visible spectrum. The UV–Vis absorption bands are assigned to the charge transfer from the oxygen ligands to the central vanadium atom inside the [VO 4 ] 3− groups in the orthovanadate compounds. The optical band gaps E g of both samples are evaluated using Kubelka–Munk function. The analysis of the data revealed the existence of optical allowed direct transition for Na x Li 1−x CdVO 4 (x = 0.5, 1). Spectroscopic ellipsometry measurements have been performed on Na x Li 1−x CdVO 4 (x = 0.5, 1) specimens and their optical properties were analyzed using the Cauchy model.