Article ID Journal Published Year Pages File Type
1617144 Journal of Alloys and Compounds 2011 8 Pages PDF
Abstract

The LaFe11.6Si1.4 compounds are prepared by arc-melting and then annealed at different high temperatures from 1323 K(5 h) to 1623 K(2 h). The powder X-ray diffraction and metallographic microscopy show that 1423 K and 1523 K are two curial temperatures, at which large amount of 1:13 phase begins to form and the most amount of 1:13 phase is obtained, respectively. With annealing temperature increasing to 1573 K and 1623 K, a new phase of La5Si3 is detected in LaFe11.6Si1.4 compound. According to the DSC curve of as-cast LaFe11.6Si1.4 compound and the X-ray patterns of annealed LaFe11.6Si1.4 compounds, the high-temperature phase transition process is analyzed. For studying the influence of different high-temperature and short-time annealing on the Curie temperature, thermal and magnetic hysteresis, magnetocaloric effect of LaFe11.6Si1.4 compound annealed at different temperatures are also investigated.

► We have studies the influence of different annealing temperatures on the phase relation, microstructure, and magnetic properties of LaFe11.6Si1.4 compounds. ► The high-temperature phase transition process is also analyzed. ► More 1:13 phase can be obtained in the LaFe11.6Si1.4 compounds annealed at 1523 K under the same annealing time because 1523 K is close to the temperature of peritectic reaction: α-Fe + L → La(Fe,Si)13. ► Longer time annealing near the temperature of peritectic reaction is helpful to decrease the impurities and increase the maximal magnetic entropy change.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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