Impedance Spectroscopy Properties of Pr0.67A0.33MnO3 (A = Ba or Sr) Perovskites

Abstract

International audienceno abstrac

Structural and Dielectric Properties of La0.33Sr0.67M0.33Ti0.67O3±δ (M = Mn or Fe) Perovskites

“…The merge in curves of Z in the higher frequency region for the two samples is probably due to the release of space charges, between the sample and electrode, as a result of reduction in the barrier properties of the material at room temperature (sufficiently high temperature) and can be interpreted by the presence of space charge polarization. This behavior is in agreement with the reported results in the literature [29,38,39].…”

Electrical conductance and complex impedance analysis of La0.6Pr0.1Ba0.3Mn1−xNixO3 nanocrystalline manganites

“…This can be related to the decrease in grain size when Ni content increases [16]. Evidently, when the grain size decreased, the surface area reduced which gives more porosity, more grain boundaries and hence less transfer of electrons from grain to grain [30].…”

Electrical conductivity and dielectric behaviour of nanocrystalline La0.6Gd0.1Sr0.3Mn0.75Si0.25O3

“…15 Recently, direct current (dc) and alternating current (ac) transport processes have been investigated in low-hole-doped Ln-based manganite-type perovskites such as La 1Àx Ca x MnO 3 , 16 La 1Àx Sr x MnO 3 , 17 La 1Àx A x Mn 1Ày Fe y O 3 , 18 La 0.7 Sr 0.25 Na 0.05 Mn 0.9 -Ti 0.1 O 3 , 19 La 0.5 Ca 0.5Àx Ag x MnO 3 , 20 Pr 0.67 A 0.33 MnO 3 (ref. 21) and RMnO 3 (R ¼ Eu; Gd; Tb; and Dy), 22 where manganese is in a mixed valence state (Mn 3+ -Mn 4+ ). Pairs of Mn 4+ and Mn 3+ can be controlled by changing the doping level or oxygen stoichiometry.…”