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Structural, optical and conductivity properties in tetragonal BaTi<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> (0≤ <i>x</i> ≤0.1)
Structural, optical and conductivity properties in tetragonal BaTi<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> (0≤ <i>x</i> ≤0.1)
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Date
2022
Authors
L. T. H. Phong
N. T. Dang
N. V. Dang
Van-Quynh Nguyen
D. H. Manh
P. H. Nam
L. H. Nguyen
P. T. Phong
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Abstract
"This work investigates the structure, optical and electrical conductivity properties of BaTi1 xCoxO3 (0# x
#0.1) ceramics prepared by the hydrothermal method. The X-ray diffraction and Raman scattering
analysis demonstrates that the prepared samples have a single-phase tetragonal structure with P4mm
symmetry. The UV-vis diffuse reflectance spectrum confirms the influence of Co concentration on the
direct optical band gap of BaTi1 xCoxO3 ceramics. The optical band gap shifts from 3.14 eV to 3.44 eV as
the Co concentration increases from 0 to 0.1. The dielectric constant increases with the depletion of
frequency according to the Maxwell–Wagner and Koops model. The AC conductivity versus frequency
curve indicates that the conduction mechanism is determined by using the correlated barrier hopping
(CBH) model. The Cole–Cole plot of the complex impedance was investigated for the prepared samples.
The compounds showed dielectric relaxation of the non-Debye type."