X-RAY-ANALYSIS AND IR-ABSORPTION-SPECTRA OF LI-GE FERRITE

X-ray diffraction and IR spectroscopy have been used to study the mixed ferrite Li0.5+0.5xGexFe2.5-1.5xO4 (where x=0.0, 0.2-0.5). The X-ray diffraction data established that the prepared samples were homogeneous and that spinel structure was formed. The lattice parameter for each composition was calculated; the lattice parameter of the sample with x=0.0 was 0.832 nm, and that for x=0.2-0.5 had a constant value of almost-equal-to 0.828 nm. IR spectra were recorded in the range 200 to 1200 cm-1. Three main bands were observed. The band at almost-equal-to 600 cm-1 (v1) and the band at approximately 400 cm-1 (v2) were assigned to the tetrahedral and the octahedral complexes, respectively. A small band (v3) at approximately 350 cm-1 indicated the presence of octahedral divalent metal-oxygen in the complexes. When Ge content was introduced, a shoulder band appeared at 790 cm-1. This band can be related to the stretching vibrational modes of GeO4 tetrahedra.