THERMOGRAVIMETRIC AND MAGNETIC PROPERTIES OF Ni1-xZnxFe2O4 NANOPARTICLES SYNTHESISED BY COPRECIPITATION

• Published in: Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2009-10, Vol.12 (4), p.529-534
• Main Authors: Velmurugan, K, Venkatachalapathy, V S K, Sendhilnathan, S
• Format: Article
• Language: eng ; por ; spa
• ISSN: 1516-1439
• DOI: 10.1590/S1516-14392009000400025

Ni1-xZnxFe2O4 (x = 0 to 1) nanoparticles with a size < 9 nm were prepared by a chemical coprecipitation method which could be used for ferrofluid preparation. XRD, VSM and DTA-TGA (STA) were used to study the effect of variations in Zn substitution and its influence on particle size, magnetic properties such as M(s), H(c) and Curie temperature, and on the water content. ICP was used to estimate the Ni, Zn and Fe concentrations. The average crystallite size of the particles decreased from 8.95 to 6.92 nm with increasing zinc substitution. The lattice constant (a) increased with increasing zinc substitution. The specific saturation magnetisation M(s) of the particles was measured at room temperature. Magnetic parameters such as M(s), H(c) and M(r) decreased with increasing zinc substitution. The water content played a vital role for the correct determination of the cation content. The Curie temperature decreased with increasing zinc substitution.