  Er3Fe5-xAlxO12 (0.0 < x < 0.8) garnets were prepared by ball milling and
sintering at 1300 C. Rietveld refinement of the samples revealed a garnet
structure with Ia3d symmetry. The lattice parameter, cell volume, X-ray density
and magnetization of the prepared garnets decreased with the increase of Al
content (x). The coercivity of the garnets increased with x, but remained
generally low, being below 20 Oe. Low temperature magnetic measurements versus
temperature indicated that the magnetization of x = 0.0 exhibited a
compensation temperature at -186 C, however, x = 0.8 exhibited a minimum at a
higher temperature of -134 C.
