Structural and magnetic phases in ball milled strontium ferrite

被引：5

作者：

Kaczmarek, WA ^{[1
]}

Campbell, SJ

Wu, E

Idzikowski, B

Muller, KH

机构：

[1] Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia

[2] Univ New S Wales, Australian Def Force Acad, Univ Coll, Sch Phys, Canberra, ACT 2600, Australia

[3] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland

[4] Inst Festkorper & Werkstofforsch Dresden, D-01171 Dresden, Germany

来源：

MECHANICALLY ALLOYED, METASTABLE AND NANOCRYSTALLINE MATERIALS, PART 1 | 1998年 / 269-2卷

关键词：

SrFe12O19; nanostructure; magnetic properties; mechanochemistry;

D O I：

10.4028/www.scientific.net/MSF.269-272.455

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Prolonged milling of SrFe12O19 in air and vacuum results in mixtures of nanostructured iron oxides. The hexagonal ferrite structure is altered to form mixtures of nanoparticles of alpha-Fe2O3 and vacancy defected Fe3-xO4. Mechanical activation in air for 800 h results in the formation of similar to 10 nm alpha-Fe2O3 particles with both similar to 10 nm alpha-Fe2O3 (similar to 56%) and similar to 3 nm Fe3-xO4 particles (similar to 44%) being obtained in the vacuum milled state. The vacancy defected magnetite particles are likely to form as a result of mechanochemical reduction of alpha-Fe2O3 in the oxygen free environment. The range of nanoparticle sizes obtained on milling is reflected by the relaxation effects observed at room temperature and 4.2 K in the Mossbauer spectra of the milled products. A spin glass-like irreversibility in magnetisation is observed below similar to 150 K.

引用

页码：455 / 460

页数：6