Title :
Structure and magnetic properties of quenched (MnxAl1-x)3O4 spinels and Hausmannites
Author :
Nakamura, Yuichiro ; Smith, Paul A. ; Laughlin, David E. ; De Graef, Marc ; McHenry, Michael E.
Author_Institution :
Dept. of Mater. Sci. & Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
Manganese aluminate spinels and Hausmannites, namely (Mnx Al1-x)3O4, with compositions varying between x=0.33 and x=1.00 have been synthesized by sintering of MnO and Al2O3 mixtures. Lattice parameters of these spinels and Hausmannites increase linearly with increasing Mn content and depend on neither sintering temperature nor cooling rate. Magnetic hysteresis loops at 5 K show non-saturating features up to 5 T. Ferrimagnetic Curie temperatures of spinels and Hausmannites both increase monotonically with increasing Mn content
Keywords :
Curie temperature; aluminium compounds; exchange interactions (electron); ferrimagnetic materials; lattice constants; magnetic hysteresis; magnetic structure; manganese compounds; stoichiometry; (MnxAl1-x)3O4; (MnAl)3O4; 5 K; Hausmannites; Mn content; cooling rate; ferrimagnetic Curie temperature; lattice parameters; magnetic hysteresis loops; sintering; sintering temperature; spin arrangement; spinels; Chemical analysis; Cooling; Land surface temperature; Magnetic hysteresis; Magnetic properties; Manganese; Powders; Saturation magnetization; Temperature dependence; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
