Summerfield scaling model and conduction processes defining the transport properties of silver substituted half doped (La–Ca) MnO3 ceramic

Moualhi, Y.; Rahmouni, H.; Gassoumi, M.; Khirouni, K.

doi:10.1016/j.ceramint.2020.06.261

Cited by 33 publications

(28 citation statements)

References 75 publications

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“…In the temperature range

, the dominant conduction mechanism is the variable range hopping, and the temperature dependence of the DC conductivity obeys the Mott-VRH (Mott- Variable Range Hopping) law [ 43 ]:

where

—pre-exponential parameter, and

—a parameter depending on the density of states in Fermi level.…”

Section: Resultsmentioning

confidence: 99%

Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

et al. 2021

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La-, Nd- and La/Nd-based polysubstituted high-entropy oxides (HEOs) were produced by solid-state reactions. Composition of the B-site was fixed for all samples (Cr0.2Mn0.2Fe0.2Co0.2Ni0.2) with varying of A-site cation (La, Nd and La0.5Nd0.5). Nominal chemical composition of the HEOs correlates well with initial calculated stoichiometry. All produced samples are single phase with perovskite-like structure. Average particle size is critically dependent on chemical composition. Minimal average particle size (~400 nm) was observed for the La-based sample and maximal average particle size (5.8 μm) was observed for the Nd-based sample. The values of the configurational entropy of mixing for each sample were calculated. Electrical properties were investigated in the wide range of temperatures (150–450 K) and frequencies (10−1–107 Hz). Results are discussed in terms of the variable range hopping and the small polaron hopping mechanisms. Magnetic properties were analyzed from the temperature and field dependences of the specific magnetization. The frustrated state of the spin subsystem was observed, and it can be a result of the increasing entropy state. From the Zero-Field-Cooling and Field-Cooling regimes (ZFC-FC) curves, we determine the <S> average and Smax maximum size of a ferromagnetic nanocluster in a paramagnetic matrix. The <S> average size of a ferromagnetic cluster is ~100 nm (La-CMFCNO) and ~60 nm (LN-CMFCNO). The Smax maximum size is ~210 nm (La-CMFCNO) and ~205 nm (LN-CMFCNO). For Nd-CMFCNO, spin glass state (ferromagnetic cluster lower than 30 nm) was observed due to f-d exchange at low temperatures.

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“…In the temperature range

, the dominant conduction mechanism is the variable range hopping, and the temperature dependence of the DC conductivity obeys the Mott-VRH (Mott- Variable Range Hopping) law [ 43 ]:

where

—pre-exponential parameter, and

—a parameter depending on the density of states in Fermi level.…”

Section: Resultsmentioning

confidence: 99%

Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

et al. 2021

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“…The behavior is also conductive, but the dc conductance is lower, particularly for temperatures above 480 K, where it can be around one order of magnitude lower. The dc conductance (G dc ) obeys the Arrhenius law [48]. The type of observed variation is reported to happen in disordered and polycrystalline materials [48][49][50][51][52][53][54].…”

Section: Electrical Propertiesmentioning

confidence: 91%

“…The obtained s 1 values are presented in Figure 3d, for both doped and undoped samples. This parameter informs about the nature of the activated conduction process in the ac conductance regime [48][49][50]. It can be observed that, in this temperature range, (i) s 1 decreases linearly with increasing temperature and (ii) s 1 < 1.…”

Section: Electrical Propertiesmentioning

confidence: 97%

“…In manganite polycrystalline systems [48][49][50], the semiconductor behavior of the materials is correlated with the activation of a number of conduction processes, such as the small polaron hopping (SPH) and the variable range hopping mechanisms. In theoretical works [51][52][53][54], Mott assumes that the high temperature range of G dc must be investigated in terms of a thermally activated SPH model.…”

Section: Electrical Propertiesmentioning

confidence: 99%

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Influence of the Physical Properties on the Antibacterial and Photocatalytic Behavior of Ag-Doped Indium Sulfide Film Deposited by Spray Pyrolysis

et al. 2021

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Spray pyrolysis was used to deposit indium sulfide (In2S3) films, with or without silver doping. The films are polycrystalline, and the inclusion of Ag in the In2S3 structure leads to the formation of a solid solution, with the crystallite size of the order of tens of nanometers. In2S3 films exhibit a semiconductive behavior, and the incorporation of Ag leads to an increase of the charge carrier concentration, enhancing the electrical conductivity of the films. The small polaron hopping mechanism, deduced by the fittings according to the double Jonscher variation, explains the evolution of the direct current (dc) conductivity at high temperature of the Ag-doped indium sulfide. From impedance spectroscopy, it was found that the doped film presents dielectric relaxation, and Nyquist diagrams indicate the importance of the grain and the grain boundaries’ contributions to the transport phenomena. The physical characteristics of the films have an influence on the photocatalytic performance, achieving photodegradation efficiency above 80% (85.5% in the case of Ag doping), and on the antibacterial activity. The obtained results indicate that indium sulfide films are good candidates for environmental and biological applications, confirming a multifunctional nature.

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“…To get an idea about the charge transport properties and with a view to examine the validity of the time temperature superposition principle, we interest on the application of scaling model. [63][64][65] In such approach, the frequency and the conductance axis must be scaled with respect to the hooping frequency (n H ) and the DC conductance (G dc ) parameters, respectively. The curves of the conductance spectra are scaled using the following relation: Fig.…”

Section: =4mentioning

confidence: 99%

Possibility of controlling the conduction mechanism by choosing a specific doping element in a praseodymium manganite system

et al. 2020

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Summerfield scaling model and conduction processes defining the transport properties of silver substituted half doped (La–Ca) MnO3 ceramic

Cited by 33 publications

References 75 publications

Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

Influence of the Physical Properties on the Antibacterial and Photocatalytic Behavior of Ag-Doped Indium Sulfide Film Deposited by Spray Pyrolysis

Possibility of controlling the conduction mechanism by choosing a specific doping element in a praseodymium manganite system

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