Band Gap Narrowing of MgO and Mg&lt;sub&gt;0.95&lt;/sub&gt;Zn&lt;sub&gt;0.05&lt;/sub&gt;O Nanostructures

Chayed, Nor Fadılah; Badar, Nurhanna; Elong, Kelimah; Kamarulzaman, Norlıda

doi:10.4028/www.scientific.net/ssp.307.273

Cited by 2 publications

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“…The band gap of a pure MgO NP is smaller than that of the bulk one, e.g., for d = 20 nm it is calculated to be 5.15 eV (see inset in Figure 7 ). A similar decrease of

in MgO nanostructures is observed in [ 18 , 61 , 62 , 63 , 64 , 65 , 66 ]. The results for Co or Fe ion-doped MgO NPs are presented in Figure 7 , curves 1 and 2.…”

Section: Numerical Results and Discussionsupporting

confidence: 78%

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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“…The band gap of a pure MgO NP is smaller than that of the bulk one, e.g., for d = 20 nm it is calculated to be 5.15 eV (see inset in Figure 7 ). A similar decrease of

in MgO nanostructures is observed in [ 18 , 61 , 62 , 63 , 64 , 65 , 66 ]. The results for Co or Fe ion-doped MgO NPs are presented in Figure 7 , curves 1 and 2.…”

Section: Numerical Results and Discussionsupporting

confidence: 78%