# Synthesis and characterization of sub-micron size Co-Ni alloys using malonate as precursor

Elumalai, P and Vasan, HN and Verelst, M and Lecante, P and Carles, V and Tailhades, P (2002) Synthesis and characterization of sub-micron size Co-Ni alloys using malonate as precursor. In: Materials Research Bulletin, 37 (2). pp. 353-363.

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## Abstract

Sub-micron size $(0.2 - 0.6\mu m)$ particles of $Co_1 - x Ni_x (0\leq x \leq1)$ alloys have been synthesized by the polyol method using Co–Ni malonates as precursors but without using any protective agents such as PVP or any other surfactants. The synthesized alloys are found to be homogeneous. EDX analysis of the alloys showed particle-to-particle uniformity in composition. SEM showed largely non-agglomerated, almost spherical particles, with a fairly narrow size distribution. In the first reported effort of its kind, WAXS analysis was carried out to estimate the amounts of HCP and FCC phases present in pure Co and $Co_{0.8}Ni_{0.2}$. Coercivity, saturation magnetization and remanent magnetization at room temperature for all the compositions are reported. These results agree well with the composition of the alloys.

Item Type: Journal Article Copyright of this article belongs to Elsevier. A. Alloys;B. Chemical synthesis;C. X-ray diffraction;D. Magnetic properties Division of Chemical Sciences > Solid State & Structural Chemistry Unit 02 Jun 2006 19 Sep 2010 04:29 http://eprints.iisc.ernet.in/id/eprint/7490