Synthesis and physical properties of pyrochlore cobalt oxides Bi1.56-xCaxSb1.48Co0.96O7-δ

A new solid solution Bi1.56-xCaxSb1.48Co0.96O7-δ (0≤x≤0.3) with a pyrochlore-like structure (A2B2O7) was synthesized in air by chemical solid-state reaction. The solution crystallized in the cubic system with the Fd-3m space group. A regular decrease of the lattice parameter was observed when calciu...

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Bibliographic Details
Published in:Cerâmica 2023-04, Vol.69 (390), p.87-92
Main Authors: Sellami, M., Zouaoui, K., Talbi, B., Mekki-Douadji, C., Berahal, M., Merabet, F., Ezziane, K.
Format: Magazinearticle
Language:English
Subjects:
Bismuth
calcium
Chemical synthesis
cobalt
Cobalt oxides
Crystallization
Dielectric loss
electrical conductivity
Electrical resistivity
Ferromagnetism
Low temperature
Magnetic permeability
magnetic susceptibility
MATERIALS SCIENCE, CERAMICS
Permittivity
Physical properties
pyrochlore
Pyrochlores
solid solution
Solid solutions
X-ray
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Summary:A new solid solution Bi1.56-xCaxSb1.48Co0.96O7-δ (0≤x≤0.3) with a pyrochlore-like structure (A2B2O7) was synthesized in air by chemical solid-state reaction. The solution crystallized in the cubic system with the Fd-3m space group. A regular decrease of the lattice parameter was observed when calcium replaced bismuth in the A site. The electric measurements showed that the electrical conductivity increased with the temperature and that high values of relative permittivity and dielectric loss were put in evidence. Measurements of magnetic susceptibility indicated a paramagnetic behavior of the samples with an effective moment included between 4.81 and 5.12 μB and at a low temperature para-ferromagnetic transition was observed for fractions x= 0.2 and 0.3.
ISSN:0366-6913
1678-4553
1678-4553
DOI:10.1590/0366-69132023693903404