Magnetic properties of rare-earth compounds of the type GdCo5-xBx

Abstract The magnetic properties of several rare-earth compounds of the type RCo 5− x B x were investigated by means of X-ray diffraction and measurements of the magnetisation in high magnetic fields. From the magnetic isotherms obtained on free powder particles at 4.2 K, we determined values of the spontaneous magnetisation and the Gd–Co intersublattice-coupling constant. It is shown that there is a very strong decrease of the Co moment with B concentration while the intersublattice-coupling constant remains virtually unaffected.