Powders with superparamagnetic Fe3C particles studied with Mossbauer spectrometry

被引：13

作者：

David, B. ^{[1
]}

Schneeweiss, O. ^{[1
]}

Dumitrache, F. ^{[2
]}

Fleaca, C. ^{[2
]}

Alexandrescu, R. ^{[2
]}

Morjan, I. ^{[2
]}

机构：

[1] Acad Sci Czech Republic, Inst Phys Mat, Vvi, Zizkova 22, CZ-61662 Brno, Czech Republic

[2] Natl Inst Lasers, Plasma & Radiat Phys, Bucharest 077125, Romania

来源：

INTERNATIONAL CONFERENCE ON THE APPLICATIONS OF THE MOSSBAUER EFFECT (ICAME 2009) | 2010年 / 217卷

关键词：

MAGNETIC NANOPARTICLES; PYROLYSIS;

D O I：

10.1088/1742-6596/217/1/012097

中图分类号：

O59 [应用物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Two nanopowders with superparamagnetic Fe3C particles were synthesised by the method of laser-induced pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mossbauer spectrometry and standard magnetic measurements. The mean crystallite size of Fe3C was 3 nm for the first sample and 10 nm for the second sample (Scherrer formula), i.e. it was lower than in our previously studied ferromagnetic Fe3C-based sample. Fe3C phase in both present samples exhibited by similar to 20 K reduced Curie temperature which is interpreted as a nanosize effect. After annealing of the samples at 1073 K for 30 minutes the Curie temperature of the Fe3C phase in both samples matched its standard bulk value. Beside Fe3C phase also Fe3O4 and carbon black were present in the synthesised samples.

引用

页数：4

共 8 条

[1]

Combining resonant/non-resonant processes:: Nanometer-scale iron-based material preparation via CO2 laser pyrolysis [J].

Alexandrescu, R ;

Morjan, I ;

Voicu, I ;

Dumitrache, F ;

Albu, L ;

Soare, I ;

Prodan, G .

APPLIED SURFACE SCIENCE, 2005, 248 (1-4) :138-146

[2]

Magnetic properties of nanometric Fe-based particles obtained by laser-driven pyrolysis [J].

David, B. ;

Pizurova, N. ;

Schneeweiss, O. ;

Klementova, M. ;

Santava, E. ;

Dumitrache, F. ;

Alexandrescu, R. ;

Morjan, I. .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2007, 68 (5-6) :1152-1156

[3]

Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4

[4]

Synthesis, properties, and applications of iron nanoparticles [J].

Huber, DL .

SMALL, 2005, 1 (05) :482-501

[5]

Magnetic nanoparticles [J].

Kodama, RH .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :359-372

[6]

Size and interface effects on ferromagnetic and antiferromagnetic transition temperatures [J].

Lang, X. Y. ;

Zheng, W. T. ;

Jiang, Q. .

PHYSICAL REVIEW B, 2006, 73 (22)

[7]

Magnetic nanoparticles:: Synthesis, protection, functionalization, and application [J].

Lu, An-Hui ;

Salabas, E. L. ;

Schueth, Ferdi .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2007, 46 (08) :1222-1244

[8]

Grain-size-dependent Curie transition in nanocrystalline Gd: the influence of interface stress [J].

Michels, D ;

Krill, CE ;

Birringer, R .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 250 (1-3) :203-211

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