Abstract
This work involves the synthesis and study of physical properties of the La0.8Ca0.1Pb0.1Fe0.975Mg0.025O3 compound, which has been characterized by various experimental techniques, such as X-ray diffraction, SEM and complex impedance spectroscopy. The structural study showed that the La0.8Ca0.1Pb0.1Fe0.975Mg0.025O3 compound crystallized in the orthorhombic structure with the Pnma space group. The particle size and the surface morphology of this compound have been analysed using SEM. The particle size was found to be around 120 nm and we confirmed that one particle contains more than one crystallite. Importantly, the studied compound presented a giant dielectric permittivity (ε′ of around 9 × 104 at high temperature and low frequencies). An equivalent electric circuit has been deduced from the Nyquist plots of the complex impedance parts (Z′′ vs. Z′) to correctly describe the electrical behavior of the La0.8Ca0.1Pb0.1Fe0.975Mg0.025O3 compound. The chosen circuit consists of two cells mounted in series corresponding to the grain and grain boundary contributions. The electrode contribution has been detected from the frequency dependence of the imaginary part of modulus where the activation energy of each constitution has been calculated. The relaxation process and the electrical conductivity are attributed to the same type of charge carriers characterized by similar values of the activation energy determined from loss factor tangent (tg(δ)), the imaginary part of the permittivity and the modulus spectrum.
Highlights
A great effort has been made on the iron oxides of formula LaFeO3 and their derivatives, both from the structural point of view and their physical properties, which have proved to be of interest, for example in the eld of gas sensors
This work focused on the development and study of the physical properties of the La0.8Ca0.1Pb0.1Fe0.975 Mg0.025O3 compound, which has been characterized by various experimental techniques such as X-ray diffraction, scanning electron microscope (SEM) and complex impedance spectroscopy
The X-Ray Diffraction (XRD) study showed that this compound crystallized in the orthorhombic structure with the Pnma space group
Summary
Of general formula A1ÀxMxFeO3, with A 1⁄4 La, and M 1⁄4 Ca and Pb, have attracted signi cant attention due to their interesting structural and physical properties, such as ferromagnetism with metallic conduction, the order of charge, the Colossal magnetoresistance (CMR)[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23] and the magnetocaloric effect (MCE).[4,5,6,7,8,9,10] In this context, a great effort has been made on the iron oxides of formula LaFeO3 and their derivatives, both from the structural point of view and their physical properties, which have proved to be of interest, for example in the eld of gas sensors. The aim of this manuscript was to study the effect of the insertion of the 2.5% Mg cation into the B-site of the La0.8Ca0.1Pb0.1FeO3 compound, synthesized by the sol–gel method and annealed at 800 C, on the structural and dielectric properties
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