Effects of Au content on the structure and magnetic properties of L1{sub 0}-FePt nanoparticles synthesized by the sol–gel method

Journal Article · Tue Jul 01 00:00:00 EDT 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2014.03.041· OSTI ID:22334276

Liu, Yang ^[1]; Jiang, Yuhong ^[1]; Kadasala, Naveen ^[2]; Zhang, Xiaolong ^[1]; Mao, Chenyi ^[2]; Wang, Yaxin; Liu, Huilian; Liu, Yanqing ^[1]; Yang, Jinghai ^[1]; Yan, Yongsheng ^[3]

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1. Institute of Condensed State Physics, Jilin Normal University, Siping 136000 (China)
2. Department of Chemistry, Purdue University, West Lafayette, IN 47907 (United States)
3. Institute of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 (China)

(FePt){sub 100−x}Au{sub x} (x=0, 5, 10, and 20) nanoparticles were synthesized by the sol–gel method, and effects of Au content on the structural and magnetic properties of samples were investigated. Au doping reduced the phase transition temperature from face-centered cubic (FCC) to face-centered tetragonal (FCT) structure. In addition, additive Au promotes the chemical ordering of L1{sub 0} FePt NPs and increases the grain size of L1{sub 0} FePt NPs. When Au content increased from 0 to 10 at%, the coercivity (H{sub c}) increased due to the increase in degree of ordering S and grain size of L1{sub 0} FePt NPs. By increasing the Au content to 20 at%, H{sub c} decreased. - Graphical abstract: (FePt){sub 100}Au{sub 0} NPs are the coexistence of FCT and FCC phases. However, no hints of FCC phase were found for the (FePt){sub 100−x}Au{sub x} NPs (x=5, 10 and 20), which indicates that addition of gold greatly promotes the FCC to FCT phase transition. - Highlights: • (FePt){sub 100−x}Au{sub x} (x=0, 5, 10 and 20) nanoparticles (NPs) were synthesized. • Au addition promotes the chemical ordering of L1{sub 0} FePt NPs. • Au addition reduces ordering temperature of L1{sub 0} FePt NPs from FCC to FCT phase. • (FePt){sub 90}Au{sub 10} NPs show a high coercivity of 9585 Oe at room temperature.

• OSTI ID: 22334276
• Journal Information: Journal of Solid State Chemistry, Vol. 215; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COERCIVE FORCE
FCC LATTICES
GOLD
GRAIN SIZE
MAGNETIC PROPERTIES
NANOPARTICLES
PHASE TRANSFORMATIONS
SOL-GEL PROCESS
TRANSITION TEMPERATURE