Self-propagating high-temperature synthesis of lithium-chromium ferrites Li0.5Fe2.5-xCrxO4

摘要: Pure and chromium-substituted lithium ferrites have been made in air by self-propagating high-temperature synthesis (SHS), a combustion process involving the reaction of peroxide, iron oxide, chromium oxide or metal powders. Three series SHS samples were produced: only; followed sintering at C for 2 h; magnetic field 1.1 T h. X-ray data showed that cubic spinel ferrite was produced all cases, with single-phase products achieved after sintering. Systematic changes lattice parameter seen both as function Cr content and, sintered samples, result applied during SHS. Scanning electron microscopy crystallites had sizes order . Electron microprobe analysis EDAX indicated homogeneous expected Fe-to-Cr ratios. Mossbauer hysteresis there significant sublattice occupancy nett magnetization content. Coercive forces Cr-doped larger than those pure compositions. Some differences between parameters zero-field applied-field observed.