Rath, C and Anand, S and Das, R P and Sahu, K K and Kulkarni, S D and Date, S K and Mishra, N C (2002) Dependence on cation distribution of particle size, lattice parameter, and magnetic properties in nanosize Mn-Zn ferrite. Journal of Applied Physics, 91 (4). pp. 2211-2215.
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In Mn1-xZnxFe2O4 (x=0 to 1) nanosize particles prepared through hydrothermal precipitation we observe a decrease in particle size from 13 to 4 nm with increasing Zn concentration from 0 to 1. The lattice constant, a, for all Mn/Zn concentrations is found to be less than that for the corresponding bulk values. At specific compositions within x=0.35 and 0.5, the temperature dependence of the magnetization exhibits a cusp-like behavior below the temperature at which the nanoparticles undergo a ferri- to para-magnetic transition (T-c). The Curie temperatures, T-c, of the nanoparticles are in the range of 175-500 degreesC, which are much higher than their corresponding bulk values. To explain these unusual features, the strong preferential occupancy of cations in chemically inequivalent A and B sites and the metastable cation distribution in nanoparticles are invoked. (C) 2002 American Institute of Physics.
|Official URL/DOI:||DOI: 10.1063/1.1432474|
|Uncontrolled Keywords:||THIN-FILM HEADS; MNFE2O4 PARTICLES; NICKEL; TRENDS|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||INVALID USER|
|Deposited On:||25 Jul 2011 18:09|
|Last Modified:||11 Jan 2012 10:09|
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