Dielectric and magnetic properties of three-layers laminated ceramic composite, K0.5Na0.5NbO3/CoFe2O4/K0.5Na0.5NbO3

Franco Júnior, Adolfo; Banerjee, Prasun; Lima, Rodrigo José da Silva

Dielectric and magnetic properties of three-layers laminated ceramic composite, K0.5Na0.5NbO3/CoFe2O4/K0.5Na0.5NbO3

Data

2018

Autores

Franco Júnior, Adolfo

Banerjee, Prasun

Lima, Rodrigo José da Silva

Resumo

Three-layers laminated ceramic composite system of K0.5Na0.5NbO3/CoFe2O4/K0.5Na0.5NbO3 (KCK) were prepared by conventional solid state reaction method. SEM analyzes revealed negligible inter-diffusion of chemical elements along the boundary layers in the laminated ceramic composite, KCK. The relative dielectric permittivity of the sandwiched ceramic composite was investigated in a broad frequency range, 101 –106 Hz at room temperature. The real part of the relative dielectric permittivity of KCK was strongly frequency dependent; being ∼ 1250 and ∼ 700 for 100 and 1 KHz, respectively. Also the dielectric study showed a deviation of Cole–Cole relaxation in CoFe2O4 and KNa0.5NbO3 materials to Maxwell–Wagner relaxation in the KCK. It was found that the magnetic properties such as saturation magnetization (Ms ∼ 77 emu/g), remanent magnetization (Mr ∼ 12 emu/g) and coercive field (Hc ∼ 320 Oe ) of KCK were quite the same as ferrimagmetic spinel bulk cobalt ferrite at room temperatur

Citação

FRANCO JR., A.; BANERJEE, P.; LIMA, R. J. S. Dielectric and magnetic properties of three-layers laminated ceramic composite, K0.5Na0.5NbO3/CoFe2O4/K0.5Na0.5NbO3. Journal of Materials Science: materials in electronics, Berlin, v. 29 p. 4357–4364, 2017. DOI: 10.1007/s10854-017-8384-2. Disponível em: https://link.springer.com/article/10.1007/s10854-017-8384-2. Acesso em: 4 set. 2023.