Abstract
We investigate the effect of sintering temperature on the structural and magnetic properties of La1.4Ca1.6Mn2O 7 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.
Original language | English |
---|---|
Pages (from-to) | 3717-3722 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 509 |
Issue number | 9 |
DOIs | |
Publication status | Published - 3 Mar 2011 |
Externally published | Yes |
Keywords
- Curie temperature
- Magnetocaloric effect
- Perovskite manganites
- Sintering temperature