Influence of Ce doping on electrical and thermal properties of La0.7−xCexCa0.3MnO3 (0.0≤x≤0.7) manganites

Varshney, Dinesh; Mansuri, Irfan; Kaurav, Netram; Lung, W.Q.; Kuo, Y. K.

doi:10.1016/j.jmmm.2012.05.028

Cited by 21 publications

(6 citation statements)

References 45 publications

(72 reference statements)

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“…Both the experimental and refined XRD patterns are shown in figure 3. The structural parameters and fit factor values, which are in line with the previously reported values [21][22][23] are listed in table 1.…”

Section: Synthesis and Structural Characterizationsupporting

confidence: 84%

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

2018

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Calcium-doped lanthanum manganite (LCMO) powder was synthesized via hydrothermal method. The structural, morphological and optical properties of the resulting powder was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma-atomic emission spectroscopy (ICP-AES spectrometer), field emission scanning electron microscopy (FESEM) and UV-Vis spectroscopy (UV-Vis). The XRD results showed the existence of only one crystalline phase. FESEM image indicates that the LCMO sample has nanowire structure with an average diameter of ∼125 nm. The band gap energy of the sample was about 2.13 eV. The as-prepared nanowires showed sufficient visible-light photocatalytic activity for the water treatment from dyes and toxic organic materials. The photodegradation efficiency for decolourizing methylene blue solution (7 ppm) by LCMO nanowires (0.07g l −1), after 360 min illumination, was about 73% with a reaction rate constant of 0.003 min −1. The six times cycled results suggested the great long-term stability of the photocatalyst.

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Section: Synthesis and Structural Characterizationsupporting

confidence: 84%

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

2018

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“…The density of states in turn yields the electronic specific heat coefficient using c 5 (pk B ) 2 N(e F )/3 (see Table IV). It is noticed that the above values are consistent with the c values in another hole doped divalent manganites 51,52 and could not be compared due to the lack of experimental data on monovalent doped manganites. The effective mass of the carrier along the conducting Mn-O plane is deduced from electronic specific heat coefficient c, using, m* 5 3Z 2 pcd/k B 2 .…”

Section: Discussion and Analysis Of Resultsmentioning

confidence: 79%

Electrical transport in the ferromagnetic state of silver substituted manganites La_1−xAg_xMnO₃ (x = 0.05 and 0.1)

2015

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The present study focuses on a quantitative analysis of electrical resistivity in monovalent-doped manganites La 1Àx Ag x MnO 3 (x 5 0.05 and 0.1). The electrical resistivity data in the ferromagnetic (FM) metallic phase are analyzed by considering a temperature-independent inelastic scattering of the electrons (due to domain and grain boundaries, defects, etc.) and other temperature-dependent elastic scattering mechanisms (electron-electron, electron-phonon, and electron-magnon). The Debye and Einstein temperatures are deduced from the model Hamiltonian containing potential energy contribution from the long-range Coulomb, van der Waals (vdW) interaction, and shortrange repulsive interaction up to the second-neighbor ions. The electron-phonon scattering partially describes the reported FM metallic resistivity behavior with temperature for La 1Àx Ag x MnO 3 (x 5 0.05 and 0.1). The T 2 and T 4.5 terms accounting for electron-electron and electron-magnon interactions are essential for the correct description of resistivity. The Mott-Ioffe-Regel criterion for metallic conductivity is valid, and k F l ; 1, e F s ; 1.

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“…The estimated electron parameters for La 0.7-Ca 0.25 K 0.05 MnO 3 (La 0.7 Ca 0.2 K 0.1 MnO 3 ) are the Fermi wave vector k F = 3.581 (4.586) 9 10 7 cm -1 , the Fermi velocity v F = 2.035 (2.105) 9 10 7 cms -1 and the plasma frequency x p = 1.406 (1.831) eV. We stress that the effects induced by electron correlations and mass renormalizations by electron-electron interactions are crucial in magnetic systems such as doped manganites [55][56][57][58][59][60][61][62][63][64][65].…”

Section: Discussion and Analysis Of Resultsmentioning

confidence: 87%

“…We notice that enhanced electron mass m * = 2.031 (2.514) m e in La 0.7 Ca 0.3-x K x MnO 3 leads to the reduced plasma frequency, and hence the reduced zero temperature elastic scattering rate in comparison to conventional metals. It is perhaps worth noticing that, in holedoped manganites, the scattering rate at low temperatures is of the order of 10 15 s -1 [55][56][57][58][59][60][61][62][63][64][65]. Furthermore, the MottIoffe-Regel criterion for metallic conductivity is valid, as the deduced mean free path is larger than the Mn-O bond length.…”

Section: Discussion and Analysis Of Resultsmentioning

confidence: 99%

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Varshney

Dodiya

2014

J Theor Appl Phys

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The temperature dependence of electrical resistivity, q, of ceramic La 0.7 Ca 0.3-x K x MnO 3 (x = 0.05, 0.1) is investigated in metallic and semi-conducting phase. The metallic resistivity is attributed to be caused by electron-phonon, electron-electron and electron-magnon scattering. Substitutions affect average mass and ionic radii of A-site resulting in an increase in Debye temperature h D attributed to hardening of lattice with K doping. The optical phonon modes shift gradually to lower mode frequencies leading to phonon softening. Estimated resistivity compared with reported metallic resistivity, accordingly q diff. = [q exp. -{q 0 ? q e-ph (=q ac ? q op )}], infers electron-electron and electron-magnon dependence over most of the temperature range. Semi-conducting nature is discussed with variable range hopping and small polaron conduction model. The decrease in activation energies and increase in density of states at the Fermi level with enhanced Ca doping is consistently explained by cationic disorder and Mn valence.

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Influence of Ce doping on electrical and thermal properties of La0.7−xCexCa0.3MnO3 (0.0≤x≤0.7) manganites

Cited by 21 publications

References 45 publications

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

Electrical transport in the ferromagnetic state of silver substituted manganites La_1−xAg_xMnO₃ (x = 0.05 and 0.1)

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

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Influence of Ce doping on electrical and thermal properties of La0.7−xCexCa0.3MnO3 (0.0≤x≤0.7) manganites

Cited by 21 publications

References 45 publications

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

Synthesis and characterization of calcium-doped lanthanum manganite nanowires as a photocatalyst for degradation of methylene blue solution under visible light irradiation

Electrical transport in the ferromagnetic state of silver substituted manganites La1−xAgxMnO3 (x = 0.05 and 0.1)

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

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Electrical transport in the ferromagnetic state of silver substituted manganites La_1−xAg_xMnO₃ (x = 0.05 and 0.1)