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

被引：2
作者：
Apostolova, Iliana [1 ]
Apostolov, Angel [2 ]
Wesselinowa, Julia [3 ]
机构：
[1] Univ Forestry, Kl Ohridsky Blvd 10, Sofia 1756, Bulgaria
[2] Univ Architecture Civil Engn & Geodesy, Hristo Smirnenski Blvd 1, Sofia 1046, Bulgaria
[3] Sofia Univ St Kliment Ohridski, Fac Phys, J Bouchier Blvd 5, Sofia 1164, Bulgaria
来源：
MATERIALS | 2023年 / 16卷 / 06期
关键词：
MgO nanoparticles; ion doping; room-temperature ferromagnetism; magnetic hyperthermia; band gap; phonon energy; RAMAN-SCATTERING; ANTIBACTERIAL; NANOSTRUCTURES; MICROCRYSTALS; IMPURITIES; SPECTRUM; PURE; IRON;
D O I：
10.3390/ma16062353
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The influence of size and doping effects on the magnetization M, phonon ? and band gap energy E-g 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 E-g 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 T-C = 315 K, i.e., they are appropriate for application in magnetic hyperthermia, they satisfy the conditions for that. The energy of the phonon mode ? = 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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页数：13
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