Iranian Journal of Materials Science and Engineering
Iran University of Science & Technology
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Showing 1 results for Lamfaddal
The Study of Structure and Transitional Phases in B0.95Bi0.05Ti1-xFexO3 Ceramics Synthesized by Solid State Route
Najwa Gouitaa, Lamcharfi Taj-Dine, Bouayad
Lamfaddal
, Abdi Farid, Mohamed Ounacer, Mohammed Sajieddine,
Volume 18, Issue 2 (June 2021)
Abstract
The structural and dielectric properties of iron and bismuth co-substituted BaTiO
3
ceramic with the formula: B
0.95
Bi
0.05
Ti
1-x
Fe
x
O
3
for x=0.00 to 1.00, synthesis with solid state route, were characterized. The X-ray diffraction results show a tetragonal phase for x=0.00. While for x=0.40 to 0.80 we observed a coexistence of tree phase tetragonal, hexagonal and pseudo-cubic. And at x=1.00 only the pseudo-cubic phase is present and the other phase disappeared. The Raman results indicate the existence of tetragonal band for x≤0.40, and an appearance of characteristic bands of Fe
3+
ions for more than 0.40 of Fe content. The SEM micrographs show an increase in grain size with the increase of Fe content and it reaches a maximum at x=0.40. And
the Mossbauer spectroscopy indicates that our samples is paramagnetic at room temperature and that the Fe is oxidized under Fe
3+
with no existence of Fe
2+
and Fe
4+
ions
. The temperature dependence of dielectric permittivity was investigated in the frequency range from 20 Hz to 2MHz.
The results show three dielectric relaxation phase transitions from a rhombohedral ferroelectric to orthorhombic ferroelectric (T
R-O
) then to a tetragonal ferroelectric phase (at T
O-T
), and finally to cubic paraelectric at the Curie temperature (T
C
).
In addition, the temperature of phase transition shifted to the lower temperature with the increase of Fe content for all the phase transitions. And the maximum of dielectric permittivity increases for T
R-O
while for T
T-O
and T
m
phases transitions, it reaches a maximum at x=0.60 and x=0.80 respectively and then decreases.
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