Crystal defects in flux grown lithium ferrite, LiFe5O8 single crystals

Abstract

With the increase of frequencies in microwave communications lithium ferrite single crystals attract growing interest.The characteristic crystal defects of a flux-grown LiF%0 s single crystal were investigated by means of light microscopy, scanning electron microscopy and X-ray topography with respect to the technology. At the beginning of the growth process crystal grains with slightly different orientations and with boundaries containing dislocation groups were forme& Thermal stresses caused cracks. The curved cracks were accompanied by strain fields of helices partly decorated by preeipitates visible on the topographs and also by light microscope. Far from the nucleation site of the crystal large perfect regions containing only straight small-angle boundaries cou]d be found. Precipitates, presumably of LiFeO~, were present in all parts of the crystal. Dislocation arrangements characteristic of stacking faults also appeared on the crystal.

Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8

“…(111)-Oriented single crystals of LiFe 5 O 8 were grown by the flux method, details of which were reported elsewhere. 36 We used two samples. One is a 110 μm thick single crystal for the measurements of terahertz radiation and optical spectroscopy in the near-infrared to visible region (0.5−4 eV).…”

“…(111)-Oriented single crystals of LiFe 5 O 8 were grown by the flux method, details of which were reported elsewhere . We used two samples.…”