Shalimar C. Zanatta, Flávio F. Ivashita, Klebson L. da Silva, Carla F. Cerqueira Machado e Andrea Paesano Jr.

Hyperfine Interact – Volume: 224; Pages: 307–312; DOI 10.1007/s10751-013-0813-x

We have investigated the mechanosynthesis of gadolinium iron garnet (GdIG) by high-energy ball-milling of 3.(Gd2O3) + 10.(α-Fe) followed by thermal annealing conducted at moderate temperatures (1100 ◦C). The samples were characterized by X-ray diffraction and Mössbauer spectroscopy in order to determine the influence of the milling time on the final products. For as-milled samples the results revealed the enlargement of the magnetic component belonging to iron and a discrete paramagnetic component. The formation of a garnet phase was observed in all as-annealed samples treated at 1100 ◦C for 6 h in quantities proportional to the time of grinding the precursors. Evidently, high-energy ball milling of Gd2O3 + α-Fe powders is an important step in GdIG synthesis by a ceramic method. Single-phase garnet is observed for the samples milled for 12 and 24 h treated at 1100 ◦C for 6h.