Microstructures and mechanical properties of Ce1−xCaxO2−y (x=0.05, 0.1, 0.2) with different sintering temperatures

Electrical properties of Ca-doped ceria electrolytes prepared by proteic sol-gel route and by solid-state reaction using mollusk shells

“…Lattice parameter of the calcined Ca-doped ceria powders were in a range of 5.416 ± 0.003 A. These values are similar to those seen in the literature [39,40], and slightly above the value for standard CeO 2 (a ¼ 5.389 A, ICSD card 28709). According to the Vegard's Law, the concentration of the solute (Ca) determines the lattice parameters of the solution (CeO 2 ), and the magnitude of changes depends on the nature of the involved species.…”

Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

“…There is a general agreement that a reduction of porosity tends to improve the mechanical properties [35][36][37][38][39], while the grain size effect differs for the different types of mechanical properties. For instance, hardness increases with decreasing grain size [40,41], following a Hall-Petch relationship, while the elastic modulus usually does not depend on the grain size [39,40,42,43]. A higher mechanical strength has been reported for ceramics with smaller grain size [34,44,45].…”

“…To improve the microstructural characteristics and the mechanical properties, optimizing the sintering profile represents an effective and straightforward way [34,40,47,48]. Generally, both grain size and density of ceramic materials increase with the sintering temperature [49], which is followed by agglomeration and size-proportional growth of pores [33].…”

Non-classical electrostriction in calcium-doped cerium oxide ceramics

“…[37][38][39] At high concentrations, calcium tends to segregate in various CeO x -CaO mixtures at the near-grain boundaries and triple points, making their analysis highly complex. 40 Herein, we fabricate highly dense polycrystalline CDC ceramics with different dopant concentrations, x = 0.025-0.15, to systematically examine the inuence of the nominal calcium (associated with V $$ O ) concentration on the electrostrictive behaviour and structural, microstructural, mechanical, and dielectric properties. The results are compared with those of state-of-the-art 10 mol% Gd-doped ceria sintered under similar conditions.…”