Análise física do composto BaNbxFe2-xO4

Abstract

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.