SciELO - Scientific Electronic Library Online

 
vol.12 issue4Influence of calcium carbonate nanoparticles on the crystallization of olypropylene author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Materials Research

Print version ISSN 1516-1439

Abstract

VELMURUGAN, Kandasamy; VENKATACHALAPATHY, Vellaiyappan Sangli Karuppanan  and  SENDHILNATHAN, Sechassalom. Thermogravimetric and magneticproperties of Ni1-XZnxFe2O4 nanoparticles synthesized by coprecipitation. Mat. Res. [online]. 2009, vol.12, n.4, pp.529-534. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392009000400025.

Ni1-xZnxFe2O4 (x = 0 to 1) nanoparticles of size less than 9 nm were prepared by a chemical coprecipitation method which could be used for ferrofluid preparation. XRD, VSM and DTA-TG (STA) were used to study the effect of variation in Zn substitution and its influence on particle size, magnetic properties such as MS, HC and Curie temperature, as well as on the water content. ICP was used to estimate Ni, Zn and Fe concentrations. The average crystallite size (DaveXR) of the particles was found to decrease from 8.95 to 6.92 nm with increasing zinc substitution. The lattice constant (ao) increased with increasing zinc substitution. The specific saturation magnetization (MS) of the particles was measured at room temperature. Magnetic parameters such as MS, Hc, and Mr were found to decrease with increasing zinc substitution. Estimation of the water content, which varies the Zn concentration, plays a vital role for the correct determination of cation contents. The Curie temperature was found to decrease with increasing zinc substitution.

Keywords : coprecipitation; fine particles; nanoferrites; spinel.

        · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License