SYNTHESIS AND INVESTIGATION OF PROPERTIES OF COMPOSITE CERAMICS LuAG: Ce / Al2O3

Abstract

The purpose of this work was to study the effect of the aluminum oxide impurity content on the features of vacuum sintering, optical and luminescent properties of composite ceramics LuAG:Ce / Al2O3. Ceramic powders LC-1, LC-2, LC-3 of the composition Lu2,98Ce0,02Al5O12 / Al2O3 were synthesized, where the corundum content was 0, 10, 20 wt.% respectively. The dynamics of shrinkage of ceramic compacts by dilatometry, morphology and elemental analysis of the surface of sintered ceramics LuAG are investigated: Ce / Al2O3 – by scanning electron microscopy. Light transmission and luminescence spectra were obtained. It is shown that with an increase in the content of corundum in the composition of ceramic powder, the temperatures of the beginning and end of shrinkage increase. In this case, the residual porosity is concentrated in areas of ceramics containing mainly corundum crystallites, as a material with a higher sintering temperature. It was revealed that the inclusion of the corundum phase prevents the uncontrolled growth of ceramic grains. Composition with a corundum content of 10 wt.% showed the highest value of luminescence intensity. At the same time, with an increase in the proportion of corundum in composite ceramics, a slight broadening of the luminescence spectra was observed.