948 Int. J. Nanotechnol., Vol. 8, Nos. 10/11/12, 2011 Copyright © 2011 Inderscience Enterprises Ltd. High density nanoparticle Mn-Zn ferrite synthesis, characterisation and magnetic properties R.B. Tangsali* and J.S. Budkuley Department of Physics, Department of Chemistry, Goa University, Taleigao Plateau, Goa 403206, India E-mail: rbtangsali@ubnigoa.ac.in E-mail: yaksha16@rediffmail.com E-mail: jsbudkuley@rediffmail.com *Corresponding author S.H. Keluskar Department of Physics, P.E.S.S.R.S.N. College of Arts and Science, Farmagudi, Goa 403401, India E-mail: shpk@rediffmail.com G.K. Naik Department of Chemistry, S.P. Chowgule. College of Arts and Science, Margao, Goa 403601, India E-mail: ganpatnaik@rediffmail.com S.C. Watave Department of Physics, Gogate Gogalekar College, Ratnagari, Maharashtra, India E-mail: Shrikantwatawe@yahoo.com Abstract: The amazing magnetic properties exhibited by nanoparticles Mn-Zn ferrites and their promising technological and medical applications have attracted much interest in recent years. Nanoparticle Mn x Zn (1-x) Fe 2 O 4 spinel ferrites with x = 0.6/0.63/0.65/0.67/0.7 were synthesised by the nitrilotriacetate precursor method employing microwave combustion synthesis. Powder X-ray diffractometry (XRD) confirmed the formation of the ferrite phase in all samples. IR analysis was done to verify formation of spinel structure. Elemental analysis using EDS confirmed the nanoparticle composition. The crystallite size was calculated from peak widths using the Scherrer formula, yielding a size in the range of 10–25 nm. Transmission electron microscopy was also performed on the samples to testify formation of nanosized crystallites in the sample. Saturation magnetisation (Mr), retentivity (Ms) and coercivity (Hc) measurements were carried out on the samples using standard hysteresis