Structural, charge density and bond length variations in c-Y2O3 influenced by progressive cerium additions
The impact of assorted levels of cerium substitutions in Y2O3 and the resultant structural and mechanical characteristics were evaluated. The sol–gel technique was used for powder synthesis to substitute cerium in the range from 10 to 100 mol%. The results accomplished complete dissolution of cerium in the cubic Y2O3 (c-Y2O3) lattice, and the resultant structural stability was preserved up to 1500 °C. Nevertheless, absence of the crystallization of the thermodynamically stable cubic CeO2 is apparent in all the investigated compositions, which implies the presence of cerium in the Ce3+ state and also favors its comprehensive accommodation in the c-Y2O3 lattice. The distribution of the high electron density cloud at specific locations in the c-Y2O3 lattice is obviously due to Ce3+ inclusions. The typical emission of Ce3+ was determined in the range 380–440 nm. A steady upsurge in the mechanical properties of Y2O3 with respect to the incremental addition of Ce3+ was also determined.