Static and dynamic magnetic properties and effect of surface chemistry on the morphology and crystallinity of DyCrO3 nanoplatelets

Gupta, Praveena; Bhargava, Richa; Das, Raja; Poddar, Pankaj

doi:10.1039/c3ra43088j

Cited by 71 publications

(52 citation statements)

References 44 publications

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“…Cr(2p) electron binding energy values were found to be located at 586 and 587ev for Cr 2p 1/2 , and 576 and 579 eV for Cr 2p 3/2 respectively. The lower binding energy peak located at 576 eV is assigned to the Cr 3+ state 24 . While the peak located at 579 eV is attributed to higher oxidation state Cr 6+ 24 .…”

Section: Resultsmentioning

confidence: 99%

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Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Bumajdad

Al-Ghareeb

Madkour

et al. 2017

Sci Rep

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Herein, we report the synthesis of chromium oxide nanoparticles, α -Cr2O3 NPs, followed by full characterization via XRD, SEM, XPS, and N2 sorptiometry. The synthesized nanoparticles were tested as catalysts toward the oxidation of CO. The impact of calcination temperature on the catalytic activity was also investigated. CO conversion (%), light-off temperature, T50, data were determined. The results revealed that chromia obtained at low calcination temperature (400 °C) is more active than those obtained at high calcination temperatures (600° or 800 °C) and this is ascribed to the smaller particle size and higher surface area of this sample. The results revealed a superior catalytic activity of Cr2O3 NPs at lower temperature as we reached a complete conversion at 200 °C which is high value in the forefront of the published results of other non-noble catalysts. The high activity of Cr2O3 nanoparticles (T50 as low as 98 °C) where found to be dependent on a careful selection of the calcination temperature. These results may provide effective and economic solutions to overcome one of the major environmental threats.

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Section: Resultsmentioning

confidence: 99%

“…The lower binding energy peak located at 576 eV is assigned to the Cr 3+ state 24 . While the peak located at 579 eV is attributed to higher oxidation state Cr 6+ 24 . The results indicate that despite the fact that the calcination products are essentially α-Cr 2 O 3 , the surface is partially oxidized to expose Cr ≥3+ ions.…”

Section: Resultsmentioning

confidence: 99%

Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Bumajdad

Al-Ghareeb

Madkour

et al. 2017

Sci Rep

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“…32 Raman spectra were recorded on a HR-800 Raman spectrophotometer (Jobin Yvon-Horiba, France) using monochromatic radiation (achromatic Czerny-Turner type monochromator with silver treated mirrors) emitted by a He-Ne laser (633 nm), operating at 20 mW and with Raman-shi detection accuracy of AE1 cm À1 between 450 nm and 850 nm, equipped with thermoelectrically cooled (with Peltier junctions), multi-channel, spectroscopic-grade CCD detector (1024 Â 256 pixels of 26 microns) with dark current lower than 0.002 electrons per pixel per s using a 100Â objective. The details of sample preparation and characterization are reported elsewhere.…”

Section: Experimental and Characterizationmentioning

confidence: 99%

Using Raman and dielectric spectroscopy to elucidate the spin phonon and magnetoelectric coupling in DyCrO₃ nanoplatelets

Gupta

Poddar

2015

RSC Adv.

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In this study, we report the phonon-mode assignment of DyCrO 3 nanoplatelets by Raman spectroscopy. The temperature dependent Raman studies indicate the shift in the phonon frequency of most intense modes of DyCrO 3 and the observed change in Raman line-width is correlated with the spin-phonon coupling. The impedance spectroscopy reveals anomalies in the dielectric constant vs. temperature curve in the proximity of the magnetic transitions, thereby hinting towards possible weak magnetoelectric coupling in DyCrO 3 nanoplatelets. For the first time, UV-vis absorption spectroscopy and photocatalytic activity of DyCrO 3 nanoplatelets have been reported. The optical absorption spectrum gives the band gap $2.8 eV for DyCrO 3 nanoplatelets suggesting them as a good candidate for studying photocatalytic activity. The DyCrO 3 nanoplatelets showed an efficient photocatalytic activity by degrading 65% methyl orange after 8 h irradiation.Fig. 7 (a) UV-Vis absorption spectra and (b) band edge energy of DCO nanoplatelets. (c) UV-Vis absorption spectra and (d) photodegradation efficiency of MO as a function of irradiation time under UV light by DCO nanoplatelets.This journal is

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“…Recently, they are regaining new interest because of their possible applications in new devices as multiferroic materials. Orthochromites exhibit antiferromagnetic structure and ferroelectric order appearing below the magnetic ordering temperature T Néel (120–291 K) …”

Section: Introductionmentioning

confidence: 99%

Polarized Raman scattering on single crystals of rare earth orthochromite RCrO₃ (R = La, Pr, Nd, and Sm)

Camara

Phuoc

Monot‐Laffez

et al. 2017

J Raman Spectroscopy

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We report on polarized Raman scattering on orthorhombic RCrO3 (R = La, Pr, Nd, and Sm) single crystals at room temperature. The analysis of polarized Raman spectra as a function of polarizer and analyzer angles with respect to crystallographic axes allowed to observe in these flux grown crystals phonon modes that were not detected yet. On the basis of both Raman selection rules and lattice dynamics calculations within density functional perturbations theory framework, the observed Ag, B1g, B2g, and B3g phonon modes were unambiguously assigned. Phonon mode wave number evolutions as a function of orthorhombic distortion, related to rare earth ionic radius, were investigated and highlighted a complex behavior for several low wave number modes allowed crossing. For the modes of same symmetry, a mode mixing behavior is observed, and numerical calculations based on two or three coupling systems were performed to fit experimental data and to extract the coupling constants.

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Static and dynamic magnetic properties and effect of surface chemistry on the morphology and crystallinity of DyCrO3 nanoplatelets

Cited by 71 publications

References 44 publications

Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Using Raman and dielectric spectroscopy to elucidate the spin phonon and magnetoelectric coupling in DyCrO₃ nanoplatelets

Polarized Raman scattering on single crystals of rare earth orthochromite RCrO₃ (R = La, Pr, Nd, and Sm)

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Static and dynamic magnetic properties and effect of surface chemistry on the morphology and crystallinity of DyCrO3 nanoplatelets

Cited by 71 publications

References 44 publications

Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Non-noble, efficient catalyst of unsupported α-Cr2O3 nanoparticles for low temperature CO Oxidation

Using Raman and dielectric spectroscopy to elucidate the spin phonon and magnetoelectric coupling in DyCrO3 nanoplatelets

Polarized Raman scattering on single crystals of rare earth orthochromite RCrO3 (R = La, Pr, Nd, and Sm)

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Product

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Using Raman and dielectric spectroscopy to elucidate the spin phonon and magnetoelectric coupling in DyCrO₃ nanoplatelets

Polarized Raman scattering on single crystals of rare earth orthochromite RCrO₃ (R = La, Pr, Nd, and Sm)