Rare earth-doped ceria (RDC) has higher values of ionic conductivity than fully yttria-stabilized zirconia (8YSZ), in the temperature range of 600-800^oC.  The main drawback of CeO₂-based electrolytes is the increased electronic conduction under low oxygen partial pressure, that is accompanied by the reduction of Ce⁴⁺ to Ce³⁺. It has been reported that reduction of ceria-based materials can be neglected at lower temperatures, around 600-700^oC. However, such low temperatures are not suitable for singly doped-ceria operations, as SOFC¢s electrolyte material has a high resistance. One possible way to improve their electrical conductivity is through structural modification of ceria solid solution.

The aim of this work was to examine how codoping small quantities of MO  (M = Ca, Ba, Sr) in Ce_1-xSm_xO₂ solid solutions influenced the electrical and mechanical properties of ceria-based materials  The sol-gel method was used to prepare CeO₂-based powders. Transmission electron microscopy was used to observe morphology of powders. Phase composition and lattice parameters were examined with XRD diffraction analysis. Scanning electron microscopy was used to observe a microstructure of samples. Electrical properties were studied by a.c impedance spectroscopy in the temperature range of 200-800^oC. In order to determine the oxide ion transfer number, the EMF of oxygen concentration cell was measured. For different Sm₂O₃-CeO₂-MO (M = Ba, Sr, Ca) compositions the relation between structure, microstructure, electrical properties are presented and discussed.

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