INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Thermal evolution of CaO-doped HfO2 films and powders
BAROLÍN S.; CARACOCHE M.C.; MARTÍNEZ J. A.; RIVAS P. C.; TAYLOR M. A.; PASQUEVICH A. F.; DE SANCTIS O. A.
Puerto Iguazú, Argentina
Simposio; XIX Latin American Symposium on Solid State Physics; 2008
Solid solution of ZrO2 and HfO2 are potential electrolyte materials for intermediate-temperature SOFC because both are oxygen ion conductors; therefore the thermal activation of the diffusion Oxygen vacancies, activation energy, is the most important issue for reaching that aim. In this work the thermal evolution of CaO-HfO2 materials have been investigated. (CaO)y-Hf(1-y) (y:0.06, 0.14 y 0.2) coatings and powders were synthesized by Chemical Solution Deposition (CSD). Films were deposited onto alumina substrates by Dip Coating technique, the burning of organic waste was carried out at 500°C under normal atmosphere and then the films were thermally treated at intervals of temperature rising to a maximum temperature of 1250°C. On the other hand, the thermal evolution and crystallization process of powders were analyzed in situ by HT-XRD. In the films, by means Atomic Force Microscopy (AFM) and Glazing Incidence X-Ray diffraction (f-2q configuration) the evolution of morphology, phases and crystal size were studied. By powders, values of activation energies of diffusion Oxygen vacancies were estimated. These values were compared with the ones obtained from the thermal evolution of the relaxation constant measured by Perturbed Angular Correlations technique.