Investigation of structural, electrical and dielectric properties of sol-gel prepared La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x=0.0, 0.1) manganites

The perovskite sample La0.7Sr0.25Na0.05Mn0.7Ti0.3O3 (LSNM0.70T0.30) was produced via a solidstate route process. Impedance spectra of LSNM0.70T0.30 in the frequency interval [40Hz -1MHz] were studied at several temperatures [80K to 440 K]. The ac conductivity (ac) established that according to the Jonscher law. ac is described by Non-overlapping Small Polaron Tunneling model at low temperatures and Correlated Barrier Hopping model at high temperatures. From dc conductance analysis, conduction seems to be thermally activated, suggesting the existence of semiconductor process. Detailed investigation of impedance data revealed the non-Debye nature of the relaxation processes in the sample. In addition, Dielectric constant curves were applied to examine the relaxation dynamics of charge carriers. In fact, the Debye-like relaxation was performed on the basis of the polarization of spatial charges following Maxwell-Wagner model and Koop's phenomenological theory.

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“…The similar process was found in Pr0.8-xBixSr0.2MnO3 [49] , in La0.67-xEuxBa0.33Mn0.85Fe 0.15O3 [50] and in Pr0.5-xGdxSr0.5MnO3 [51].…”

Section: Dielectric Resultssupporting

confidence: 81%

“…The inset of Fig. 2(a) depicts an example of adjustment of the data for the temperature 100 K. Similar results were found for La0.67-xEuxBa0.33Mn0.85Fe0.15O3 manganites [18], La0.9Sr0.1MnO3 ceramic [19].…”

Section: Ac Conductivity Studysupporting

confidence: 77%

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

Raddaoui

Kossi

Brahem

et al. 2021

J Mater Sci: Mater Electron

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“…So, to determine WM values, inset Fig. 7 we illustrate the fit of (Ln (ε ) vs Ln (ω)) spectra using Eq.10, the obtained values of WM is found to be 0.218 eV for CuFeCr0.5Ni0.5O4.We noticed, an increasing of WM with increasing temperature and the same behavior of m-T curve which can be correlated to the disorder on our compound [67]. all curves of Z" are entangled and overlapped on one single curve showing that the relaxation time dynamics is independent to the increases of temperature [68].…”

Section: Dielectric Studymentioning

confidence: 61%

Structural, dielectric and electrical properties of Sol–gel auto-combustion technic of CuFeCr0.5Ni0.5O4 ferrite

et al. 2021

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The CuFeCr0.5Ni0.5O4 (CFO) compound was synthesized using sol-gel reaction combustion technic. The structural analysis showed that the obtained composites have a polycrystalline nature and the cubic spinel structure ( 3 ̅ space group). Microstructural analysis revealed the formation of spherical and elongated grains of our sample. The dielectric and electrical transport properties of CuFeCr0.5Ni0.5O4 were investigated in detail by Ac impedance spectroscopy in a wide range of temperature (200 K-400 K) and frequency (100Hz to100KHz). Our results show that the electrical modulus and impedance studies confirm the presence of a relaxation phenomenon with non-Debye type in the prepared sample. The activation energy Edc estimated from the slope of the linear fit plot is equal to 0.158 eV with frequency of 100Hz and 0.126 eV with frequency of 1MHz at temperature range 200K-400K.Close activation energies values were found from analyzes of relaxation time and dcconductivity indicating that the relaxation and the conduction processes may be attributed to the presence of free carrier charges and impurities at the grain boundaries. The conduction process for samples is described by the NSPT model. The complex impedance analyses and modulus formalism confirm a grain and grain boundary mechanism contributing to the dielectric properties. The real and the imaginary parts of the impedance are well fitted to equivalent electrical circuit (Rg+ Rgb//CPEgb) was used for modeling the Nyquist data.

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“…This electrical circuit can be considered as the best representation of the relationship between real and imaginary impedances. The circuit is composed by an Rg resistance that represents the response of the grains, that is placed in series with a circuit (Rgb/CPEgb) which referes to the response of grain boundaries, being Rgb and CPEgb the grain boundary resistance and capacitance, respectively (Ncib et al, 2018).…”

Section: Methodsmentioning

confidence: 99%

Electrical Conductivity Behavior of La0.5Ca0.5Mn0.5Fe0.5O3 Synthetized by the Solid State Reaction

Martinez-Rodriguez¹,

Jurado²

2018

MAS

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La0.5Ca0.5Mn0.5Fe0.5O3 was synthesized using the solid state reaction method. This method consists of two main processes: a milling process and a subsequent thermal treatment. Two samples at different conditions were produced: one using 2 h of milling time and 900°C (M-I), and the other using 6 h of milling time and 1200°C of thermal treatment (M-II).  X-ray diffraction analysis indicated, in both cases, an orthorhombic crystalline ordering of the space group Pbnm. For the case of M-I, the material exhibited secondary phases, different than the desired phase; on the contrary, in M-II, these secondary phases were not present. The dielectric response determined using electrochemical impedance spectroscopy (EIS) performed in a temperature range between 20°C and 300°C exhibited a thermally activated semiconductor behavior with activation energies of Eg= 0.11±0.05 eV and Eg= 0.47±0.06 eV for M-I and M-II, respectively.

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Investigation of structural, electrical and dielectric properties of sol-gel prepared La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x=0.0, 0.1) manganites

Cited by 42 publications

References 54 publications

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

Structural, dielectric and electrical properties of Sol–gel auto-combustion technic of CuFeCr0.5Ni0.5O4 ferrite

Electrical Conductivity Behavior of La0.5Ca0.5Mn0.5Fe0.5O3 Synthetized by the Solid State Reaction

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