M.Mesrar
Signals, Systems and Components Laboratory (LSSC), Morocco
Scientific Tracks Abstracts: J Biosens Bioelectron
The lead-free ferroelectric ceramics with the formula of (1-x)Na0.5Bi0.5TiO3-xK0.5Bi0.5TiO3 (x = 0.00, 0.12, 0.16,
0.17, 0.18, 0.19, 0.20 and 0.30) were synthesized by conventional solid-state method. The binary system has been
designed based on the phase diagram. The XRD patterns recorded at room temperature proved the phase formation
of the samples. Using Rietveld refinement method which allow us to verify the morphotropic phase boundary
(MPB) at x=0.12-0.18. The limits of rhombohedral and tetragonal solid solutions were successfully formed, as well
as the evolution of their lattice parameters as a function of composition and temperatures were revealed. From the
Scanning Electron Microscopy (SEM) analysis, have revealed uniform distribution of grains and change in grain
size with the increase in K0.5Bi0.5TiO3 concentration. Presence of functional groups has been determined by Raman
Spectroscopy at room-temperature. Electrical properties of ceramics are systematically modified by the K0.5Bi0.5TiO3
content. Electromechanical coupling factor kp = 0.291 are ameliorated at x = 0.12. The photocatalytic activity for the
decolorization of methylene blue under visible light irradiation of NBT powder was evaluated. In consequence, it can
be considered as a potential system in photocatalytic devices.
Keywords: (1-x)(Na0.5Bi0.5)TiO3-x(K0.5Bi0.5)TiO3; dielectric constant; Reitveld refinement ; dielectric measurements;
photocatalytic activity.
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