DocumentCode :
800731
Title :
Structural and Magnetic Properties of MnFe 
Co 
Ge Compounds
Co Ge CompoundsAuthor :
Lin, Song ; Tegus, O. ; Brück, E. ; Dagula, W. ; Gortenmulder, T.J. ; Buschow, K.H.J.
Author_Institution :
Van der Waals-Zeeman Inst., Amsterdam Univ.
Volume :
42
Issue :
11
fYear :
2006
Firstpage :
3776
Lastpage :
3778
Abstract :
The structural and magnetic properties of MnFe1-xCoxGe compounds with x=0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.85,0.9, and 1.0 were investigated by means of X-ray diffraction (XRD) and magnetization measurements. XRD shows that the MnFe1-xCoxGe compounds crystallize in the hexagonal Ni2In-type crystal structure for xles0.8 and in the orthorhombic NiTiSi-type structure for x>0.8. The magnetization measurements show that the MnFe1-xCoxGe compounds exhibit a complex magnetic behavior. The Curie temperature increases with increasing of x. The saturation magnetization of the compounds with Ni2In type structure increase with increasing of x and the saturation of the magnetization in the NiTiSi-type structure also increases with increasing x. We investigated the magnetocaloric effects in these compounds by means of magnetization measurements. The maximum magnetic-entropy change observed in these compounds reaches 9 J/kgK for x=0.8 in a field change from 0 to 5 T at around 289 K
Keywords :
Curie temperature; X-ray diffraction; cobalt alloys; crystal structure; entropy; ferromagnetic materials; germanium alloys; iron alloys; magnetisation; magnetocaloric effects; manganese alloys; 289 K; Curie temperature; MnFeCoGe; X-ray diffraction; hexagonal Ni2In-type crystal structure; magnetic phase transition; magnetic-entropy change; magnetization measurement; magnetocaloric effects; orthorhombic NiTiSi-type structure; saturation magnetization; structural properties; transition metal compounds; Crystallization; Iron; Magnetic field measurement; Magnetic materials; Magnetic properties; Refrigeration; Saturation magnetization; Temperature; X-ray diffraction; X-ray scattering; Magnetic-entropy change; magnetic phase transition; transition metal compounds;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2006.884516
Filename :
1715692
Link To Document :
