8 research outputs found
Parametric and Robust Optimization of a Vibration Absorber with a Generalized Cubic, Quadratic and Non Integer Nonlinearities of Damping and Stiffness
The Influence of Sb2O3 Phase on Critical Behavior of La0.6Sr0.4MnO3/x(Sb2O3) (x = 0, 0.7 and x = 0.18) Ceramic Composites
International audienc
Structural, magnetic and theoretical investigation of the magnetocaloric effect of La 0.6 Sr 0.4 MnO 3 /x(Sb 2 O 3 ) compound
International audienc
Synthesis, structural and magnetic behavior and theoretical approach to study the magnetic and magnetocaloric properties of the half-doped perovskite Nd0.5Ba0.5CoO3
International audienc
Study of critical magnetic behavior around the ferromagnetic–paramagnetic phase transition of the half-doped perovskite Nd0.5Ba0.5CoO3
International audienc
Study of the influence of 2.5% Mg2+ insertion in the B-site of La0.8Ca0.1Pb0.1FeO3 on its structural, electrical and dielectric properties
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 (3
0
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 (Z00 vs. Z0) 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(d)), the imaginary part of the permittivity and
the modulus spectrum