Electrical impedance spectroscopy analyses and optical properties of the bismuth lutetium tungstate BiLuWO₆

ABSTRACT

BiLuWO₆ was synthesized by a solid state reaction at 1000°C. The sample was initially compacted under ambient conditions to form a cylindrical pellet and then characterized by scanning electron microscopy, the electrical properties were determined from Electrical Impedance Spectrometry, under air, in the temperature range of 400 to 700°C. Nyquist representations were interpreted in terms of equivalent circuits, involving intrinsic and extrinsic conduction mechanisms. UV-Vis diffuse reflectance spectra infers the presence of an indirect bandgap, both direct and indirect assumption were carried out to calculate the band gap. The CIE chromaticity diagram were presented on the basis of the photoluminescence under UV, BiLuWO₆ exhibits an orange emission and a warm color temperature.

Keywords:

• BiLuWO₆
• electrical properties
• impedance spectroscopy
• indirect band gap
• optical properties
• chromaticity