Resumo:
Ferrites have become important to industry because of their electric and magnetic
properties. The cubics spinel ferrites are oxides with chemical formula MFe2O3, where
M is a metallic divalent ion. The cubic ferrites crystallize in spinel structure, the oxygen
anions are packed in face –centered cubic arrangement such that there are two kinds of
spaces between the anions – tetrahedral coordinated or A sites, and octahedral
coordinated or B sites. Due to structure characteristics, diverse magnetic configurations
can be gotten, depending on the relative site occupation by the magnetic ion (in geral
iron) in each sub lattice. This present work reports the influence of the Nb3 substitution
in the structural of Ba ferrite. The ferrite system BaNbxFe2-xO4, and the variation of x is
range of 0,00 until 1,00; using the conventional ceramic technique. The samples had
been calcined in oxidant atmosphere in 400°C for 6h, 600°C for 24h and sintered at
1000°C for 48h, using an electrical furnace type Muffle. Mössbauer spectroscopy
measurements showed the typical dilute ferrite characteristics and measurements and
measures the magnetic behavior at high temperature confirm that there was no
significant change of the Curie temperature.
