Effect of nucleating agents on synthesis of CoNi alloy particles via polyol process

• Published in: Metals and materials international Vol. 14; no. 1; pp. 117 - 121
• Main Authors: Lee, Young Min, Park, Chan Woo, Choi, Hee Kyu, Koo, Bon Heun, Lee, Chan Gyu
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.02.2008; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Copper; Copper base alloys; Diffraction; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetic properties; Magnetism; Manufacturing; Materials Science; Metallic Materials; Nanoparticles; Nucleation; Polyols; Processes; Scanning electron microscopy; Solid Mechanics; X-rays; 재료공학; CoNi alloy particles; polyol process; nucleating agent; soft magnetic; heterogeneous nucleation
• ISSN: 1598-9623; 2005-4149
• DOI: 10.3365/met.mat.2008.02.117

CoNi alloy particles were synthesized via the polyol process using nucleating agents such as copper (II) acetylacetonate and K 2 PtCl 4 . The phase, morphology, mean size, and magnetic properties were evaluated using X-ray diffractometry, field emission scanning electron microscopy, and a vibrating samples magnetometer. At [Cu]/[Co+Ni]=1×10 −6 , the size of the CoNi alloy particles was approximately 320 nm. When the nucleation molar ratio [Pt]/[Co+Ni] was 8×10 −5 , the size decreased to 95 nm. This indicates that K 2 PtCl 4 is a more effective nucleating agent for controlling the size of CoNi nanoparticles at the tens to hundreds of nanometers scale. The magnetic properties showed that the CoNi alloy particles are typical soft magnetic materials. The coercivity of CoNi alloy particles prepared by using K 2 PtCl 4 as a nucleating agent was higher than of particles prepared by using copper (II) acetylacetonate.