Substitution of La and Fe with Dy and Mn in multiferroic La1−xDyxFe1−yMnyO3 nanocrystallites

Mahmood, Azhar; Warsi, Muhammad Farooq; Ashiq, Muhammad Naeem; Ishaq, Muhammad

doi:10.1016/j.jmmm.2012.09.033

Cited by 48 publications

(9 citation statements)

References 33 publications

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“…The observed FTIR absorption band at ∼603 cm −1 could be assigned to the vibration of the Co-O bond in an octahedral coordination while the band observed at ∼551 cm −1 for La(Sr)-O bond stretching. Furthermore, the vibration of the La-O bond in a dodecahedral coordination was confirmed by the presence of a strong peak at 425 cm −1 (Khalil, 2003;Mahmood et al, 2013;Agilandeswari and Ruban Kumar, 2014).…”

Section: Electrode Preparation and Electrochemical Measurementmentioning

confidence: 91%

“…The electrochemical capacitance was determined by measuring the non-Faradaic capacitive current associated with doublelayer charging from the scan-rate dependence of CVs shown in Figure 3 (Trasatti and Petrii, 1991;Benck et al, 2012; Ouyang et al, 2019;Wang et al, 2020). Ideal catalysts for OER should have low overpotentials, be stable over time, and have high specific activity (or low surface area) (Mahmood et al, 2013). Electrochemically active surface area was calculated based on ECSA = C dl /C s where C dl and C s are double layer capacitance and specific capacitance, respectively.…”

Section: Electrochemically Active Surface Areamentioning

confidence: 99%

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Molten Salt Synthesized Submicron Perovskite La1–xSrxCoO3 Particles as Efficient Electrocatalyst for Water Electrolysis

Mohan

Mao

2020

Front. Mater.

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Perovskite oxides are an important and effective class of mixed oxides which play a significant role in the fields of energy storage and conversion systems. Here we present a series of cobaltite perovskite LaCoO 3 particles which have been doped with 0, 5, 10, 20, and 30% of Sr 2+ and have been synthesized by a combined solgel and molten-salt synthesis procedure, which provides a regular morphology of the particles. These Sr 2+-doped LaCoO 3 particles have been characterized by powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Moreover, these Sr 2+ doped LaCoO 3 particles have been demonstrated as efficient catalysts for oxygen evolution reaction (OER) based on the measured specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor using rotating disk and rotating ring-disk electrode techniques. The 30% Sr 2+-doped LaCoO 3 sample shows enhanced electrocatalytic OER activity in 0.5 M H 2 SO 4 media compared to the LaCoO 3 samples doped with 0, 5, 10, and 20% Sr 2+. Among all five LaCoO 3 samples, the doped LaCoO 3 samples demonstrate better OER activity than the undoped sample.

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Section: Electrode Preparation and Electrochemical Measurementmentioning

confidence: 91%

Section: Electrochemically Active Surface Areamentioning

confidence: 99%

Molten Salt Synthesized Submicron Perovskite La1–xSrxCoO3 Particles as Efficient Electrocatalyst for Water Electrolysis

Mohan

Mao

2020

Front. Mater.

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“…XRD results showed that the lattice constant, cell volume and X-ray density decreased with the increased Co and Ni concentration in Zn 1-x Co 0.5x Ni 0.5x Fe 2 O 4 nanoparticles that is in agreement with the theoretical predictions. Literature reveals that the crystallite size less than 50 nm is suitable to get excellent signal-to-noise ratio in switching applications [28]. Figure 2 shows the FTIR spectra of Zn 1-x Co 0.5x Ni 0.5x Fe 2 O 4 nano-ferrites for x=0.0 and 0.45.…”

Section: (Equation 5)mentioning

confidence: 99%

Nanocrystalline Zn1− Co0.5Ni0.5 Fe2O4 ferrites: Fabrication via co-precipitation route with enhanced magnetic and electrical properties

Hassan

Khan

Shahid

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…ions restrict the grain growth of the ferrite phase, whereas calcination temperatures engage their grain growth. The crystallite size less than 50 nm is desirable for obtaining a suitable signal-to-noise ratio for switching applications (Mahmood et al 2013). …”

Section: Structural Analysismentioning

confidence: 99%

Effects on structural, optical, and magnetic properties of pure and Sr-substituted MgFe2O4 nanoparticles at different calcination temperatures

Loganathan

Kumar

2015

Appl Nanosci

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In the present work, pure and Sr 2? ions substituted Mg ferrite nanoparticles (NPs) had been prepared by co-precipitation method and their structural, optical, and magnetic properties at different calcination temperatures were studied. On this purpose, thermo gravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy, UV-Visible diffused reflectance spectroscopy, impedance spectroscopy, and vibrating sample magnetometer were carried out. The exoand endothermic processes of synthesized precursors were investigated by TG-DTA measurements. The structural properties of the obtained products were examined by XRD analysis and show that the synthesized NPs are in the cubic spinel structure. The existence of two bands around 578-583 and 430-436 cm -1 in FT-IR spectrum also confirmed the formation of spinel-structured ferrite NPs. The lattice constants and particle size are estimated using XRD data and found to be strongly dependent on calcination temperatures. The optical, electrical, and magnetic properties of ferrite compositions also investigated and found to be strongly dependant on calcination temperatures.

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Substitution of La and Fe with Dy and Mn in multiferroic La1−xDyxFe1−yMnyO3 nanocrystallites

Cited by 48 publications

References 33 publications

Molten Salt Synthesized Submicron Perovskite La1–xSrxCoO3 Particles as Efficient Electrocatalyst for Water Electrolysis

Molten Salt Synthesized Submicron Perovskite La1–xSrxCoO3 Particles as Efficient Electrocatalyst for Water Electrolysis

Nanocrystalline Zn1− Co0.5Ni0.5 Fe2O4 ferrites: Fabrication via co-precipitation route with enhanced magnetic and electrical properties

Effects on structural, optical, and magnetic properties of pure and Sr-substituted MgFe2O4 nanoparticles at different calcination temperatures

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