Effect of Cr 3+ substitution at Mn-site on electrical and magnetic properties of charge ordered Bi 0.3 Pr 0.3 Ca 0.4 MnO 3 manganites

Asmira, Nor; Ibrahim, Norazila; Mohamed, Zakiah; Yahya, A. K.

doi:10.1016/j.physb.2018.05.020

Cited by 18 publications

(9 citation statements)

References 64 publications

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“…Figure 6 shows the temperature dependence of the AC susceptibility of the Nd1−xBixMnO3 system on the real part χ' with the inset dχ'/dT versus the temperature range of 30-300 K. For x = 0 and x = 0.25, a definite and sharp peak was observed at 70 K and 72 K, respectively, associated to the ordering temperature of Mn spins [22]. The observed cusp depicts the PM to AFM transition, which is consistent with the results from previous studies [5,8,23]. For x = 0.50, two sharp peaks were observed, which were at 42 K and 57 K, respectively.…”

Section: Morphologysupporting

confidence: 89%

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

et al. 2020

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This study synthesizes the neodymium-based manganites with Bi doping, Nd1−xBixMnO3 (x = 0, 0.25 and 0.50) using the solid-state reaction route. The crystal structural, morphological and magnetic properties were determined using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and AC magnetic susceptibility. The Rietveld refinement confirmed that the compounds were in the single-phase orthorhombic structure of the NdMnO3 with Pbnm space group and lattice parameter b increased with doping from 5.5571 (x = 0) to 5.6787 (x = 0.5). FTIR spectra showed that absorption bands were located within the range of 550–600 cm−1, which corresponded to the Mn–O stretching vibration. FESEM exhibited homogenous compound. The AC magnetic susceptibility measurement studies showed a strong antiferromagnetic (AFM) to paramagnetic (PM) transition existed at 76 K, 77 K and 67 K for samples (x = 0, 0.25 and 0.50), respectively.

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Section: Morphologysupporting

confidence: 89%

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

et al. 2020

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“…Step V: Calculation of the position and velocity of the agents. Equations (12) and (13) present the expression for calculating the position and velocity of the agents in the population, respectively.…”

Section: Physical Principles Of the Gravitational Search Algorithmmentioning

confidence: 99%

“…They demonstrate a high magnetocaloric effect at low applied magnetic fields, relatively cheap elemental compositions, high stability (especially in some corrosive environments) and physical parameters that can be easily tuned through doping mechanisms [5,10,11]. Doping concentration plays a crucial role in altering the magnetocaloric effect as well as the maximum magnetic entropy change (MMEC) of manganite-based compounds, since A-site average ionic radius, ratio of Mn 4+ and Mn 3+ ions and A-site disorder are strongly affected by the nature as well as the concentration of dopants [12][13][14]. A-site average ionic radius contributes mainly to magnetic properties of doped manganite through an energy bandwidth of electron alteration that is related to the observed double-exchange interaction, while A-site disorder measures A-site ionic distribution variance [15,16].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Maximum Magnetic Entropy Change of Doped Manganite Using a Grid Search-Based Extreme Learning Machine and Hybrid Gravitational Search-Based Support Vector Regression

Shamsah

Owolabi

2020

Crystals

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The thermal response of a magnetic solid to an applied magnetic field constitutes magnetocaloric effect. The maximum magnetic entropy change (MMEC) is one of the quantitative parameters characterizing this effect, while the magnetic solids exhibiting magnetocaloric effect have great potential in magnetic refrigeration technology as they offer a green solution to the known pollutant-based refrigerants. In order to determine the MMEC of doped manganite and the influence of dopants on the magnetocaloric effect of doped manganite compounds, this work developed a grid search (GS)-based extreme learning machine (ELM) and hybrid gravitational search algorithm (GSA)-based support vector regression (SVR) for estimating the MMEC of doped manganite compounds using ionic radii and crystal lattice parameters as descriptors. Based on the root-mean-square error (RMSE), the developed GSA-SVR-radii model performs better than the existing genetic algorithm (GA)-SVR-ionic model in the literature by 27.09%, while the developed GSA-SVR-crystal model performs better than the existing GA-SVR-lattice model in the literature by 38.34%. Similarly, the developed ELM-GS-crystal model performs better than the existing GA-SVR-ionic model with a performance enhancement of 14.39% and 20.65% using the mean absolute error (MAE) and RMSE, respectively, as performance measuring parameters. The developed models also perform better than the existing models using correlation coefficient as the performance measuring parameter when validated with experimentally measured MMEC. The superior performance of the present models coupled with easy accessibility of the descriptors definitely will facilitate the synthesis of doped manganite compounds with a high magnetocaloric effect without experimental stress.

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“…All the samples are found to exhibit single phase with diffraction peaks indexed based on orthorhombic structure with Pnma space group [5]. The final refinement values of lattice parameter, unit cell volume and bond angles are obtained and presented in Table1.The unit cell volume increased steadily with increase in La content indicates the substitution strongly affects the strength of local lattice distortion, although the substitution involving smaller ionic radius of La +3 (1.16 Å) compared to Bi 3+ (1.17Å) [7]. Figure 2 shows the variation of magnetic properties of Bi 0.3-x La x Pr 0.3 Ca 0.4 Mn 0.9 Cr 0.10 O 3 (x=0, x=0.05) samples as a result of La 3+ substitution.…”

Section: Structural Analysismentioning

confidence: 99%

“…Obviously, more studies are required to better understand the special role of 6s 2 lone pair electrons as well as the complex mechanism responsible for the observed MR effect. Interestingly, it was reported that La 3+ substitution at Bisite for Bi 0.6-x La x Ca 0.6 Mn 0.9 O 3 weakened charge ordered antiferromagnetic, COAFM phase and successfully induce ferromagnetic metallic, FMM phase which was suggested due to weakening of lattice distortion due to reduction of 6s 2 lone pairs of Bi 3+ [7]. In this work, the effects of La 3+ substitution at Bi-site on electrical and magnetic properties of Bi 0.3-x La x Pr 0.4 Ca 0.6 Mn 0.9 Cr 0.1 O 3 were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of La3+ Substitution at Bi-Site on Transport Properties of Bi0.3-xLaxPr0.3Ca0.4Mn0.1Cr0.9MnO3

Ibrahim¹,

Amaran²,

Mohamed³

et al. 2019

IJET

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Magnetic and electronic transport properties of Bi0.3-xLaxPr0.3Ca0.4Mn0.1Cr0.9O3 (0≤x≤0.2) manganites have been investigated by measurements of AC-susceptibility, resistivity and magnetoresistance. The samples were prepared using conventional solid-state synthesis method. Magnetic susceptibility versus temperature measurements showed all samples exhibit ferromagnetic to paramagnetic transition with Curie temperature, Tc enhanced from 111 K (x=0) to 174 K (x=0.2). Electrical resistivity measurements of the samples in zero field showed increase of metal-insulator (MI) transition temperature from 58 K(x=0) to 88 K(x=0.2). The increase in both Tc and TMI indicates enhancement of double exchange (DE) interaction involving Mn3+ and Mn4+ ions as a result of weakening of the hybridization effect between Bi3+ 6s2 lone pair with O orbital due to La3+ substitution. La substitution in the Bi-based compound is suggested reduce MnO6 octahedral distortion hence increasing delocalization of charge carriers. The observed variation in MR behavior due to La substitution indicates the substitution influence the MR mechanism of extrinsic and intrinsic behavior in Bi0.3-xLaxPr0.3Ca0.4Mn0.1Cr0.9O3 .

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Effect of Cr 3+ substitution at Mn-site on electrical and magnetic properties of charge ordered Bi 0.3 Pr 0.3 Ca 0.4 MnO 3 manganites

Cited by 18 publications

References 64 publications

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

Modeling the Maximum Magnetic Entropy Change of Doped Manganite Using a Grid Search-Based Extreme Learning Machine and Hybrid Gravitational Search-Based Support Vector Regression

Effect of La3+ Substitution at Bi-Site on Transport Properties of Bi0.3-xLaxPr0.3Ca0.4Mn0.1Cr0.9MnO3

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