MAGNETIC-PROPERTIES AND STRUCTURE OF THE INTERMETALLIC COMPOUNDS LA-2(CO1-XFEX)(16)TI

The effect of substitution of Fe for Co in the compounds La-2(Co1-xFex )(16)Ti (x = 0.0-0.5) on the crystal structure and magnetic properties has been investigated. The lattice parameters and the unit-cell volum e of La-2(Co1-xFex)(16)Ti increase with x in the range 0 less than or equal to x less than or equal to 0.44. The magnetic moment per formula unit in La-2(Co1-xFex)(16)Ti increases linearly as the Fe concentrati on increases. The Curie temperature is found to increase for x less th an or equal to 0.1 and then decrease for x > 0.1. The easy-magnetizati on direction changes from the easy-axis direction (0 less than or equa l to x less than or equal to 0.3) to the easy-plane direction (x = 0.4 ), and the anisotropy field H-A decreases with the Fe substitution. Ev idence for spin reorientation in the compounds La-2(Co1-xFex)(16)Ti fo r 0.3 less than or equal to x less than or equal to 0.44 was observed in the M-T and chi(ac)-T curves.