Preparation and Mechanical Characteristics of Multicomponent Ceramic Solid Solutions of Rare Earth Metal Oxides Synthesized by the SCS Method

A study into the use of Solution Combustion Synthesis (SCS) method with glycine and citric acid to synthesize fine powders multicomponent solid solutions oxides rare earth (RE) metals (Nd, Sm, Eu, Gd, Dy, Ho) for preparation ceramic materials is presented. parameters 4-, 5-, 6-component entropy-stabilized (REOs) a C-type cubic structure are determined. The stability (ESOs) shown depend not only on heavy RE metal quantity, but also rate heating/cooling samples. temperature polymorphic transformation REO structures B-type (monoclinic) or H-type (hexagonal) structural variants can be described by equation T (°C) = 0.0214Vcr2 − 62.737Vcr + 46390, where Vcr unit cell volume an oxide regardless number cations in solution. High-temperature thermal analysis up 1250 °C revealed that dispersed powders, which contain impurities basic carbonates along hydroxocarbonates X-ray amorphous carbon formed during SCS reactions, react air moisture storage. influence ESO phase cationic composition morphology, porosity microhardness ceramics was studied. Higher-entropy form samples higher density, smaller size particle agglomerates.