Structural and Magnetic Properties of Gd<inf>3</inf>(Fe<inf>1-x</inf>Al<inf>x</inf>)<inf>27.5</inf>Ti<inf>1.5</inf>

The structural and magnetic properties of Gd3(Fei1-xAlx)27.5Ti1.5 (0.1-0.4) have been investigated by X-ray diffraction (XRD), magnetization and Curie temperature (Tc) measurements. All the compounds have formed in Nd3 (Fe,Ti)29 (3:29) type structure with Gd(Fe,Ti)12 (1:12) phase as the secondary phase and traces of α-Fe. The unit cell parameters increase anisotropically with the A1 content. The saturation magnetization decreases with increasing A1 and is attributed to the magntovolume effect and the modification of the density of states (DOS). The increase of Curie temperature up to x = 0.3 and subsequent decrease is explained on the basis of band narrowing. The easy direction of magnetization (EMD) is away from the ab-plane up to x = 0.3 changes to along ab-plane for x = 0.4. © 2006 IEEE