Phase Composition and Magnetic Properties of Nanoparticles with Magnetite-Maghemite Structure

被引：4
|
作者：
Andronenko, Sergey I. [1 ]
Nikolaev, Anton M. [2 ,3 ]
Suharzhevsky, Stanislav M. [4 ]
Sinelnikov, Alexander A. [5 ]
Kovalenko, Anastasia S. [2 ]
Ivanova, Alexandra G. [2 ]
Shilova, Olga A. [2 ,3 ]
机构：
[1] Kazan Fed Univ, Fac Phys, Kazan 420008, Russia
[2] Russian Acad Sci, Inst Silicate Chem, St Petersburg 199155, Russia
[3] St Petersburg Electrotech Univ LETI, St Petersburg 197022, Russia
[4] St Petersburg State Univ, Fac Phys, St Petersburg 199034, Russia
[5] Voronezh State Univ, Ctr Collect Use Sci Equipment, Voronezh 394018, Russia
来源：
CERAMICS-SWITZERLAND | 2023年 / 6卷 / 03期
关键词：
magnetite; maghemite; nanopowder; solid solution; EPR; FE3O4; NANOPARTICLES; VERWEY TRANSITION; GAMMA-FE2O3; OXIDE; SYSTEMS; SIZE;
D O I：
10.3390/ceramics6030099
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Precipitation of nanopowders with mixed magnetite-maghemite composition was carried out under different conditions and with different separation techniques. The exact character of interactions of different iron oxide phases in the nanopowder was the main object of interest. The obtained nanopowders have spherical particles about 10-20 nm in size. Electron paramagnetic resonance (EPR) study showed that iron ions incorporate fully into magnetite and maghemite structures. The shape of the EPR line points out that single homogenous solid solutions were formed during synthesis. In the studied solid solutions, different ratios of vacancies and Fe2+/Fe3+ ratios were observed but in spite of different synthesis techniques in both cases, there were no additional diamagnetic structural phases presented.
引用
收藏
页码：1623 / 1631
页数：9
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