Enhance room-temperature ferromagnetism of α-Fe2O3nanomaterials by easy and scalable method

被引：7
作者：
Sui, Yi [1 ,2 ]
Lu, Fei [2 ]
Liu, Xiaoyun [1 ,2 ]
Zhang, Yingde [2 ]
Sun, Xiaohua [2 ]
Liu, Changsheng [1 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110004, Peoples R China
[2] Baotou Res Inst Rare Earths, State Key Lab Baiyunobo Rare Earth Resource Res &, Baotou 014030, Peoples R China
来源：
PHYSICS LETTERS A | 2021年 / 408卷 / 408期
基金：
国家重点研发计划;
关键词：
Fe2O3; Three-dimensional architecture; Self-assembly; Crystal distortion; Room-temperature ferromagnetism; ALPHA-FE2O3; NANOPARTICLES; DOPED ALPHA-FE2O3; MAGNETISM; HEMATITE; NANOCOMPOSITE; GAMMA-FE2O3; DEPENDENCE; MOMENT; PHASE;
D O I：
10.1016/j.physleta.2021.127488
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this study, a three-dimensional alpha-Fe2O3 nanomaterial (abbreviated as 3D-Fe2O3) with frame architecture was synthesized by an easy and scalable self-assembly route. The distortion and asymmetric covalent Fe-O bonding were generated during the self-assembly process between alpha-Fe2O3 nanocrystalline (20-50 nm) of 3D-Fe2O3 annealed at 773 K, indicating a transition from anti-ferromagnetic to ferromagnetic order at room temperature (293 K). About 7.157-15.156 wt.% alpha-Fe2O3 transformed into gamma-Fe2O3 from 823 to 923 K, enhancing the ferromagnetic performances. The maximum magnetization (M-m) reached 9.05-8.94 emu/g at temperatures of 273-303K, values about 40-fold higher than those of alpha-Fe2O3 nanoparticle (20-50 nm). (C) 2021 Elsevier B.V. All rights reserved.
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页数：7
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