Open AccessEffect of Zinc Doping on the Electrical and Dielectric Properties of CCTO Compound Synthesized by Solid-State Method
Author(s) -
Meryem Slaoui,
Najwa Gouitaa,
Youness El Issmaeli,
Ahmed Harrach,
Farid Abdi,
M. Haddad,
T. Lamcharfi
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23264
Subject(s) - dielectric , ceramic , analytical chemistry (journal) , scanning electron microscope , rietveld refinement , doping , zinc , impurity , permittivity , materials science , phase (matter) , mineralogy , calcination , chemistry , composite material , metallurgy , crystallography , crystal structure , chromatography , biochemistry , optoelectronics , organic chemistry , catalysis
In this work, the influence of zinc doping on structural and dielectric properties of CaCu(3-x)ZnxTi4O12(CCZxTO with x = 0, 2.5, 5, 7.5, 10, 12.5 and 15%) ceramics sintered at 1000 ºC for 8 h was studied.The ceramic samples were prepared by the conventional solid-state and calcined at 1050 ºC for 4 h.The X-ray diffraction (XRD) analysis of pure and Zn-doped CCTO were analyzed by using Rietveldrefinement with cubic CCTO phase with no trace impurity phase. The scanning electron microscopy(SEM) investigation showed that for Zn-doped CCTO, the grains distributions were homogenouswith average sizes which decreased with increasing of Zn concentration. The dielectric permittivity asfunction of temperature showed two dielectric anomalies (weakly and strong) and the dielectric constantvalue largely decreased for x = 2.5%, which is about tree magnitude smaller than the pure ceramic. Thenit increased and reached a maximum at x = 10%, which is larger than the value of pure ceramic. And forx > 10%, the dielectric constant decreased for about two magnitude smaller than the ceramic at x =10%. The cole-cole diagramm for all the samples showed existence of two semi-arcs attributed to thegrains and grains boundaries. It was found that the Rg values were much smaller than the Rgb value.This give an evidance on the formation of interior barrier layer capacity (IBLC).