Effect of synthesis conditions on the physicochemical properties of хerogels, nanopowders and ceramic materials in the CeO2 – Nd2O3 system

Abstract

By liquid-phase methods of synthesis: by the method of co-precipitation of hydroxides and co-crystallization of nitrate salts, highly dispersed mesoporous powders of the composition are synthesized: (SeO2)1 – x(Nd2O3)x (х = 0,05; 0,10; 0,15; 0,20, 0,25), having a specific pore volume of 0.030 – 0.111 cm3/g and a specific surface area of 7.40 – 119.26 m2/g. Based on them, ceramic nanomaterials of a given composition with CSR ~ 69 – 88 nm (1300 °С) were obtained. The physicochemical properties of the resulting ceramics have been studied; it was revealed that it is a solid solution with open porosity in the range of 17 – 30 %, high values of relative density of 89 – 96 %. In terms of their physicochemical properties (density, thermal expansion coefficient), the resulting ceramic materials are promising as solid oxide electrolytes for medium-temperature fuel cells.