离子掺杂MgO纳米颗粒的磁性、光学和声子特性。在磁热疗中的应用。

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

作者信息

Apostolova Iliana, Apostolov Angel, Wesselinowa Julia

机构信息

University of Forestry, Kl. Ohridsky Blvd. 10, 1756 Sofia, Bulgaria.

University of Architecture, Civil Engineering and Geodesy, Hristo Smirnenski Blvd. 1, 1046 Sofia, Bulgaria.

出版信息

Materials (Basel). 2023 Mar 15;16(6):2353. doi: 10.3390/ma16062353.

DOI:10.3390/ma16062353

PMID:36984231

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10051844/

Abstract

The influence of size and doping effects on the magnetization , 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. increases with decreasing NP size. 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 = 0.1 and = 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.

摘要

使用微观模型研究了尺寸和掺杂效应对MgO纳米颗粒的磁化强度、声子ω和带隙能量Eg的影响。室温铁磁性归因于MgO纳米颗粒（NPs）中的表面或/和掺杂效应。讨论了自旋 - 声子相互作用的影响。随着NP尺寸减小而增加。由于出现的不同应变，和Eg可以通过不同的离子掺杂（Co、Al、La、Fe）而增加或减小。它改变了晶格参数和交换相互作用常数。我们发现，尺寸为20nm且Fe或Co掺杂浓度分别为 = 0.1和 = 0.2的MgO NP具有居里温度TC = 315K，即它们适用于磁热疗应用，它们满足该应用的条件。声子模式ω = 448 cm-1的能量随着NP尺寸减小而增加。它随着Co和Fe的增加而增加，或随着Sr离子掺杂而减小。