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Detailed Program
Paper Number : ST-O07
Time Frame : 11:20~11:40
Presentation Date : Friday, 28, November
Session Name : Structual Ceramics & Refractory materials
Session Chair 1# : Sangwhan Park
Session Chair 2# : Satoshi Tanaka
Common Ceramics for Refrigeration: Be Cool Be Environmental Friendly
M. S. ANWAR
Changwon National University
Keywords: Ceramics, Magnetic refrigeration, XRD, Magnetization, Ceramics

Magnetic cooling based on magnetocaloric effect (MCE) has been demonstrated as a promising alternative technology to classical refrigeration (air conditioning, refrigeration, liquefaction of gases, etc.) and has a great potential to compete successfully with compression and relaxation of the gases for refrigeration. In the present work, We report detail study on the structural, magnetic, and magnetocaloric properties of Zn doped manganese-zinc ferrites with different Zn-concentrations. Polycrystalline Mn1-xZnxFe2O4 (0.0 ¡Â x ¡Â 0.7) ferrite samples were prepared using the conventional solid-state reaction method. The x-ray diffraction result indicates that the ferrite samples have a cubic spinel type structure without any impurity phase. Temperature dependent magnetization measurements and Arrott analysis reveal second order ferromagnetic transition in all samples with Curie temperature decreasing progressively with increasing Zn concentration from ~571 K for x = 0.0 to 240 K for x = 0.7. A decrease in magnetization was observed with Zn doping. A maximum in magnetic entropy change, (~1.25 Jkg-1K-1 at 2.5 T) has been observed in MnFe2O4 sample. The width of magnetic entropy curve was found to increase with the Zn concentration. Also, the and relative cooling power were found to increase with increasing the applied magnetic field, which indicates much larger cooling power to expected at higher magnetic field. This investigation suggests that Mn1-xZnxFe2O4 (0.0 ¡Â x ¡Â 0.7) ferrite samples can be used as a potential magnetic refrigerating material with wide range of temperature.
Acknowledgements : This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012-R1A1B3000784) and National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (NO.2011-0030058).