Synthesis and characterisation of magnetic iron sulfide nanocrystals

被引：21
作者：
Beal, John H. L.
Etchegoin, Pablo G.
Tilley, Richard D.
机构：
[1] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand
[2] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Wellington, New Zealand
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 189卷
关键词：
Iron sulfide; Nanocrystals; Magnetism; GREIGITE FE3S4; NATURAL PYRRHOTITE; CRYSTALLITE SIZE; PHASE-RELATIONS; GRAIN-SIZE; NANOPARTICLES; TEMPERATURE; TRANSITION; FES; MACKINAWITE;
D O I：
10.1016/j.jssc.2012.01.015
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Fe1-xS and Fe3S4 nanocrystals with a variety of morphologies and average sizes were synthesised by the reaction of iron(II) acetylacetonate (Fe(acac)(2)) and elemental sulfur in oleylamine. Reaction at 200 degrees C for 240 min produced extremely thin Fe3S4 sheets, which displayed low coercivities (14 kA m(-1)) suggestive of pseudosingle-domain or multidomain particles. Reaction temperatures >= 300 degrees C for 30 min produced 70 nm Fe1-xS nanocrystals with hexagonal plate and hexagonal prism morphologies, which displayed high magnetic coercivities (110 kA m(-1)) characteristic of single magnetic domain particles. Rapid injection of sulfur solution at 280 degrees C followed by immediate cooling produced a mixture of Fe1-xS nanocrystals and spherical, polydisperse similar to 5 nm Fe3S4 nanocrystals, which displayed superparamagnetism above an average blocking temperature of 55 K. (C) 2012 Elsevier Inc. All rights reserved.
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收藏
页码：57 / 62
页数：6
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