Structural and magnetic investigations on metastable Ag-Fe nanophase alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:557

Article

Santhi, Kalavathy^1,4  Thirumal, E.¹  Karthick, S. N.²  Kim, Hee-Je²  Narayanan, V.³  Stephen, A.¹ 

[1] Univ Madras, Ctr Mat Sci, Dept Nucl Phys, Madras 600025, Tamil Nadu, India

[2] Pusan Natl Univ, Sch Elect Engn, Pusan 609735, South Korea

[3] Univ Madras, Dept Inorgan Chem, Madras 600025, Tamil Nadu, India

[4] Womens Christian Coll, Dept Phys, Madras 600006, Tamil Nadu, India

关键词: Metals and alloys;    Chemical synthesis;    Magnetic measurements;    Thermal analysis;    Nanostructured materials;   

DOI  :  10.1016/j.jallcom.2012.12.161

来源: Elsevier

【 摘 要 】

Nanocrystalline Ag-Fe alloy samples of various compositions were synthesized by chemical reduction method using sodium borohydride as the reducing agent. The structure analysis of the as prepared and the annealed samples were carried out. The fcc structure of the as prepared samples was stable up to 400 degrees C. As bulk Ag and Fe are immiscible metals, nanophase alloy formation of these two metals was studied from the broad exothermic peak observed and the enthalpy changes were calculated from the differential scanning calorimetric analysis. The presence of Ag and Fe in their metallic form was verified by performing X-ray photoelectron microscopy studies. The microstructure of these samples reveals that the particles are nanosized. The results of the magnetic characterization of the as synthesized and annealed Ag50Fe50 sample and the conclusions drawn there from are in correlation with the metastable nature of the samples up to 400 degrees C and the phase changes in the sample annealed at 500 degrees C. (c) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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