Advanced High Temperature Magnetic Materials

Experimental studies on several Sm-Co systems have been carried out in search of improved properties of high-temperature hard-magnet materials. An important result, a record coercivity of 12.3 kOe at 500 degrees Celsius, has been achieved in a Sm-Co-Cu-Ti alloy with a relatively simple annealing procedure. Model calculations are able to explain the increase and then decrease of H sub c with temperature. Several other Sm-Co-X and rare earth-Co alloys have been studied through mechanical-milling methods. self-consistent electronic structure calculations have been made on Nd-Fe compounds and the effects of lattice expansion through hydriding determined.