Chemical synthesis and L12 ordering of CrPt3 nanoparticles

Cr–Pt nanoparticles of different compositions around the ferrimagnetic Pt3Cr have been synthesized with the thermolytic method and proper adjustment of the Pt(acac)2 and Cr(acac)2 mole ratios. The as prepared particles have a size of (5.5±1.0)nm but after heat-treatment at 850°C for 2h an inhomogene...

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Bibliographic Details
Published in:	Journal of magnetism and magnetic materials Vol. 334; pp. 107 - 110
Main Authors:	Tomou, A., Panagiotopoulos, I., Tzitzios, V., Li, Wanfeng, Hadjipanayis, G.C.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-05-2013 Elsevier
Subjects:	Chemical synthesis methods Coercive force Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Exact sciences and technology Heat treatment Magnetic properties and materials Magnetic properties of nanostructures Magnetism Materials science Methods of nanofabrication Microstructure Nanoparticles Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals Order disorder Physics Stoichiometry Structure of solids and liquids; crystallography Synthesis Stoichiometry Particle size Pt Electron diffraction Nanoparticle Platinum alloys Magnetic hysteresis Chemical ordering Order parameters Chromium alloys Heat treatments Cr Ferrimagnetic materials Nanoparticles Coercive force Ordering Microstructure Chemical synthesis L12 ordering Nanomaterial synthesis
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Summary:	Cr–Pt nanoparticles of different compositions around the ferrimagnetic Pt3Cr have been synthesized with the thermolytic method and proper adjustment of the Pt(acac)2 and Cr(acac)2 mole ratios. The as prepared particles have a size of (5.5±1.0)nm but after heat-treatment at 850°C for 2h an inhomogeneous microstructure consisting of clustered nanoparticles with variable sizes 5–50nm is obtained. Chemical ordering to the L12 phase up to S=0.83 has been achieved for the nanoparticles with optimized stoichiometry while moderate coercivity values up to 380Oe are achieved. ► Thermolytic chemical synthesis of Cr–Pt nanoparticles. ► Only partial chemical ordering to the L12 phase and moderate coercivity obtained. ► Sluggish kinetics require high heat-treatment temperatures exceeding size-dependent ordered phase critical temperature.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2013.01.025