Microstructural and chemical aspects of working-temperature aged Ca-doped CeO2

Electro-chemo-mechanical properties in nanostructured Ca-doped ceria (CDC) by field assisted sintering

“…As can be seen, the conductivity is minimum in the CDC-SPS sample throughout the examined temperatures. The low conductivity value in this nanostructured material can be ascribed to the presence of a high density of blocking barriers, strong intrinsic dopant-defect interaction as well as to crystalline disordered frozen in the material [24]. As registered, at low temperatures (< 350 °C) conductivity value of the CDC-Conv sample is larger than the GDC-Conv.…”

Non-classical electrostriction in calcium-doped cerium oxide ceramics

“…These effects have been discussed in the literature, even at low Ca 2+ concentrations. [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.…”

Recipes for superior ionic conductivities in thin-film ceria-based electrolytes

“…9,[18][19][20][21][22] Of the remaining hurdles, one of the most important is lowering the operation temperature in order to extend the device's lifetime. Many degradation phenomena, such as interdiffusion, 23,24 creep, 25,26 kinetic demixing, 27,28 and aging, [29][30][31][32] are governed by cation diffusion, a process characterised by a high activation enthalpy, (5 to 6) eV. 33,34 Hence, lowering the operation temperature by only 100 K leads to decreases in cation diffusion rates of six orders of magnitude, with corresponding increases in device lifetimes.…”