Document Type
Article
Original Publication Date
2007
Journal/Book/Conference Title
Journal of Applied Physics
Volume
101
Issue
9
DOI of Original Publication
10.1063/1.2710218
Date of Submission
November 2015
Abstract
MnFe2O4nanoparticles with diameters ranging from about 4to50nm were synthesized using a modified coprecipitation method. X-ray diffractograms revealed a pure phase spinel ferrite structure for all samples. Transmission electron microscopy showed that the particles consist of a mixture of both spherical (smaller) and cubic (larger) particles dictated by the reaction kinetics. The Néel temperatures (TN) of MnFe2O4 for various particle sizes were determined by using high temperature magnetometry. The ∼4nm MnFe2O4 particles showed a TN of about 320°C whereas the ∼50nm particles had a TN of about 400°C. The high Néel temperature, compared with the bulk MnFe2O4 TN of 300°C, is due to a change in cation distribution between the tetrahedral and octahedral sites of the spinel lattice. Results of extended x-ray absorption fine structure measurements indicate a systematic change in the cation distribution dependent on processing conditions.
Rights
Chinnasamy, C. N., Yang, A., & Yoon, S. D., et al. Size dependent magnetic properties and cation inversion in chemically synthesized MnFe2O4 nanoparticles. Journal of Applied Physics, 101, 09M509 (2007). Copyright © 2007 American Institute of Physics.
Is Part Of
VCU Chemistry Publications
Comments
Originally published at http://dx.doi.org/10.1063/1.2710218