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Effect of high temperature sintering on the structural and the magnetic properties of La1.4Ca1.6Mn2O7 |
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| Authors: | E. Ta?arkuyu,A. Co?kunA.E. Irmak,S. Aktü rkG. Ü nlü ,Y. Samanc?o?luA. Yü cel,C. Sar?kü rkç ü S. Aksoy,M. Acet |
| Affiliation: | a Department of Physics, Faculty of Sciences and Letters, Mu?la University, 48000 Kötekli, Mu?la, Turkey b Department of Chemistry, Faculty of Sciences and Letters, Mu?la University, 48000 Kötekli, Mu?la, Turkey c Experimental Physics, Duisburg-Essen University, 47048 Duisburg, Germany |
| Abstract: | We investigate the effect of sintering temperature on the structural and magnetic properties of La1.4Ca1.6Mn2O7 double perovskite manganite compound prepared by the sol-gel route. Three sintering temperatures (1273, 1473 and 1673 K) are utilized for the heat treatment. Regardless of the sintering temperature, the tetragonal crystal structure with the I4/mmm space group is stable. However, a reduction in a and an increase in c lattice parameters along with a significant increase in crystallite-size occur on increasing the sintering temperature. This is also accompanied by the growth of grains. Grain-growth and changing crystallite-sizes account for the changes in magnetization, Curie temperature and magnetic entropy-change values. As the sintering temperature increases from 1273 to 1673 K the Curie temperature increases from 225 to 268 K and the magnetic entropy-change increases from 0.58 to 3.1 J kg−1 K−1 respectively. |
| Keywords: | Perovskite manganites Sintering temperature Magnetocaloric effect Curie temperature |
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