Size dependent magnetic properties and cation inversion in chemically synthesized MnFe2O4 nanoparticles | Zendy

C. N. Chinnasamy | Zendy; Aria Yang | Zendy; S. D. Yoon | Zendy; Kailin Hsu | Zendy; Michael D. Shultz | Zendy; Everett E. Carpenter | Zendy; Sanjeev Mukerjee | Zendy; C. Vittoria | Zendy; Vincent G. Harris | Zendy

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Size dependent magnetic properties and cation inversion in chemically synthesized MnFe2O4 nanoparticles

Author(s) -

C. N. Chinnasamy,

Aria Yang,

S. D. Yoon,

Kailin Hsu,

Michael D. Shultz,

Everett E. Carpenter,

Sanjeev Mukerjee,

C. Vittoria,

Vincent G. Harris

Publication year - 2007

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.2710218

Subject(s) - spinel , coprecipitation , materials science , nanoparticle , transmission electron microscopy , analytical chemistry (journal) , ferrite (magnet) , particle size , lattice constant , crystal structure , particle size distribution , crystallography , chemistry , nanotechnology , inorganic chemistry , diffraction , metallurgy , physics , chromatography , optics , composite material

MnFe2O4 nanoparticles 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 Neel 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 Neel 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.

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