Preparation of phase segregated bcc-iron/iron-oxide nanoparitcle and their magnetic properties

2014 Fiscal Year Final Research Report

• Project/Area Number: 24750121
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Functional materials chemistry
• Research Institution: Tohoku University
• Principal Investigator: NAKAYA Masafumi 東北大学, 多元物質科学研究所, 助教 (80451681)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ナノ粒子 / 酸化鉄 / 構造制御 / ナノコンポジット磁石 / 鉄基機能性材料 / 強磁性

Outline of Final Research Achievements

In order to prepare the high performance permanent magnet, we had prepared the following materials as the precursor of nanocomposite magnet by using core-shell structure with Fe phase as soft phase and ε-Fe2O3 phase as hard phase. In order to prepare air-stable metallic Fe nanoparticles, iron-oxide nanoparticles as precursors were reduced in a hydrogen atmosphere and then their surfaces were oxidized under low concentration of oxygen. To obtain Fe2O3 phase, we treated iron oxide nanoparticles with silica shell at several temperature. The size of magnetic nanoparticles affects their magnetism. We had also controlled the particle size and crystal structure. By using SiO2 coated iron oxide nanoparticles as a precursor, we suceeded to obtain mono-phase ε-Fe2O3 nanoparticles.

Free Research Field

ナノ材料