Dependence of the Radiation Synthesis Efficiency of Ceramics Based on Tungstates on the Flow Power

Abstract

Ceramic samples of monocomponent (CaO, MgO, ZnO and WO3) and two-component (ZnWO4, MgWO4, CaWO4) compositions were synthesized by direct impact of high-energy electron flow on the charge of stoichiometric composition. Radiation synthesis of samples weighing about 50 g is realized in time of 10s without the use of any additional substances to stimulate the process. Systematic studies of the dependence of radiation synthesis of tungstate ceramics on the flux power density have been performed for the first time. It was found that the dependences of synthesis efficiency on the flux power density of monocomponent (CaO, MgO, ZnO and WO3) and two-component (ZnWO4, MgWO4, CaWO4) ceramic samples have the form of constantly increasing curves. There is a threshold above which the synthesis is realized for all synthesized samples. The effect of mutual influence of charge components on the efficiency of synthesis of twocomponent systems was found. Synthesis of ZnWO4, MgWO4, CaWO4 ceramics is realized under the same conditions of radiation treatment, while the thresholds of synthesis realization of one-component samples of CaO, MgO and ZnO and WO3 ceramics differ significantly. It is shown that at all used modes of radiation treatment the formation of ceramics with the same properties are realized. This effect is due to the inhomogeneous distribution of electron flux energy losses in the substance. Synthesis of two-component (ZnWO4, MgWO4, CaWO4) ceramic samples is realized at the same power density above 1,0 kW/cm2. The radiation synthesis of the ZnWO4, MgWO4, CaWO4 ceramics is mainly determined by tungsten oxide.