Influence of Al and Ga on Formation of the La(Fe, Si)(13)-Type Phase in the LaFe11.14Co0:66Si1.2-xMx (where x=0.1, 0.2, 0.3; M = Al, Ga) Alloys

摘要

In the present work the influence of Al and Ga on formation of La(Fe, Si)(13)-type phase in magnetocaloric LaFe11.14Co0.66Si1.2-xMx (where x = 0.1, 0.2, 0.3; M = Al, Ga) alloys subjected to annealing at 1323 K for 15 days was studied using the Mssbauer spectroscopy. For annealed samples, two crystalline phases were recognized: the dominant paramagnetic La(Fe, Si)(13)-type phase, and minor fraction of ferromagnetic alpha-Fe(Co, Si). It was revealed that Al improved formation of 1:13 phase in contrast to Ga, which caused reduction of the ability of formation of the expected phase.