X-ray, IR and SEM studies on some Li-Cd ferrites

Lithium-Cadmium ferrites with general formula Li0.5-x/2 Fe2.5-x/2 Cdx O4 (with x = 0,0.1,0.2....,0.7) were prepared by standard ceramic method. X-ray diffraction studies confirms single phase formation and lattice parameters were calculated. The crystal structure is cubic and lattice parameter increases with increasing Cd content. The infrared absorption (IR) spectra of all the samples were recorded in the range 200-800 cm-1 at room temperature in the KBr medium. Lithium ferrite shows four principal bands and some shoulders have been observed. The force constants Kt and Ko were calculated using Waldron's analysis. Scanning electron microscopy studies shows increase in grain size up to x = 0.1 and then the grain size decreases with increase in cadmium content.

ANALYSIS OF THE APPLICABILITY OF PHYSICAL MODELS TO DESCRIBE DENSIFICATION OF LITHIUM FERRITE COMPACTS DURING SINTERING IN THE FIELD OF INTENSE ELECTRON BEAM

The paper analyzes the possibility of describing the accelerated sintering of lithium-titanium compacts under high-power radiation effects in terms of classical physical models developed by Kuczynski and Johnson based on the kinetic analysis of ferrite compact densification. LiTi ferrites synthesized by ceramic technology in laboratory conditions were investigated. The first portion of the compacts was sintered in air in thermal ovens at 900–1100°C for 30 minutes at a heating rate of 900 °C/min. The second portion of the compacts was sintered in a similar mode but using a radiation-thermal method: the exposure to pulsed electron beam with energy of 1.5–2.0 MeV using the ILU-6 accelerator. The geometrical dimensions of the compacts were measured before and after sintering to determine shrinkage. Mathematical approximation of the experimental shrinkage data showed the discrepancy of both models to describe sintering of LiTi ferrite samples both under thermal sintering conditions and radiationthermal effect.