Experimental and theoretical study of Raman scattering in Co<sup>++</sup>‐ and Fe<sup>++</sup>‐doped magnesium oxide

Billat, A.; Mon, J. P.; Voisin, M.

doi:10.1002/pssb.2220670132

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…All this unequivocally shows that the observed nanocrystals inside graphene nano-enclosures are MgO. This conclusion is also consistent with the observed 125 cm −1 Raman band that was previously reported for MgO crystals 27 28 .…”

Section: Resultssupporting

confidence: 92%

Van der Waals pressure and its effect on trapped interlayer molecules

et al. 2016

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Van der Waals assembly of two-dimensional crystals continue attract intense interest due to the prospect of designing novel materials with on-demand properties. One of the unique features of this technology is the possibility of trapping molecules between two-dimensional crystals. The trapped molecules are predicted to experience pressures as high as 1 GPa. Here we report measurements of this interfacial pressure by capturing pressure-sensitive molecules and studying their structural and conformational changes. Pressures of 1.2±0.3 GPa are found using Raman spectrometry for molecular layers of 1-nm in thickness. We further show that this pressure can induce chemical reactions, and several trapped salts are found to react with water at room temperature, leading to two-dimensional crystals of the corresponding oxides. This pressure and its effect should be taken into account in studies of van der Waals heterostructures and can also be exploited to modify materials confined at the atomic interfaces.

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Section: Resultssupporting

confidence: 92%

Van der Waals pressure and its effect on trapped interlayer molecules

et al. 2016

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“…Chen et al [ 29 ] studied by the density functional theory of Raman modes in MgO nanotubes constructing stacks of squares and hexagons of MgO clusters. Raman spectra of Fe-, Co-, Cr-, and Li-ion-doped MgO were investigated experimentally in [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

2023

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The influence of size and doping effects on the magnetization M, phonon ω and band gap energy Eg of MgO nanoparticles is studied using a microscopic model. The room-temperature ferromagnetism is due to surface or/and doping effects in MgO nanoparticles (NPs). The influence of the spin–phonon interaction is discussed. M increases with decreasing NP size. M and Eg can increase or decrease by different ion doping (Co, Al, La, Fe) due to the different strain that appears. It changes the lattice parameters and the exchange interaction constants. We found that MgO NP with size of 20 nm and Fe- or Co-doping concentration x = 0.1 and x = 0.2, respectively, have a Curie temperature TC = 315 K, i.e., they are appropriate for application in magnetic hyperthermia, they satisfy the conditions for that. The energy of the phonon mode ω = 448 cm−1 increases with decreasing NP size. It increases with increasing Co and Fe, or decreases with Sr ion doping.

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Electronic Raman spectra of iron doped MgO

Poirier

Walsh

Boatner

1982

Solid State Communications

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Experimental and theoretical study of Raman scattering in Co⁺⁺‐ and Fe⁺⁺‐doped magnesium oxide

Cited by 9 publications

References 11 publications

Van der Waals pressure and its effect on trapped interlayer molecules

Van der Waals pressure and its effect on trapped interlayer molecules

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

Electronic Raman spectra of iron doped MgO

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Experimental and theoretical study of Raman scattering in Co++‐ and Fe++‐doped magnesium oxide

Cited by 9 publications

References 11 publications

Van der Waals pressure and its effect on trapped interlayer molecules

Van der Waals pressure and its effect on trapped interlayer molecules

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

Electronic Raman spectra of iron doped MgO

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Experimental and theoretical study of Raman scattering in Co⁺⁺‐ and Fe⁺⁺‐doped magnesium oxide