Phase formation with NaZn13 structure in metamagnetic La(Fe1–xCox)11.9Si1.1 compounds

• Published in: Journal of rare earths Vol. 26; no. 5; pp. 727 - 730
• Main Authors: ZHANG, Hu, BAO, Bo, SHI, Puji, FU, Bin, LONG, Yi, CHANG, Yongqin, WAN, Farong
• Format: Journal Article
• Language: English
• Published: School of Materials Science and Engineering,University of Science and Technology of Beijing,Beijing,100083,China 01.10.2008
• Subjects: magnetocaloric; X-ray diffraction; solid state reactions; rare earth alloys and compounds
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(08)60171-4

The effects of different annealing conditions on the phase formation with NaZn13 structure were investigated in La(Fe1-xCox)11.9Si1.1 (x=0.068) compounds. It was found that the 1:13 phase was not formed directly from the melt upon cooling but via a peritectic reaction between the pro-peritectic gamma-Fe and the La-rich phase. Annealing temperature was very important for the formation of 1:13 phase. Ice water was confirmed to be a preferable quenching medium. La(Fe1-xCox)11.9Si1.1 (x=0.068) compounds with almost single 1:13 phase were obtained at 1473 K after 15 d.