Thermal evolution of CaO-doped HfO2 films and powders

Solid solutions of ZrO2 and HfO2 are potential electrolyte materials for intermediate-temperature SOFC because both are oxygen-ion conductors. The main challenge for these compounds is to reduce the relatively high value of the activation energies vacancies diffusion, which is influenced by several...

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Autores principales: Barolin, S. A., Caracoche, María Cristina, Martínez, Jorge Alberto, Rivas, Patricia Claudia, Taylor, Marcela Andrea, Pasquevich, Alberto Felipe, De Sanctis, O. A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Exactas
Evolución termal
Solución
Física del estado sólido
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82752
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82752
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Evolución termal
Solución
Física del estado sólido
spellingShingle Ciencias Exactas
Evolución termal
Solución
Física del estado sólido
Barolin, S. A.
Caracoche, María Cristina
Martínez, Jorge Alberto
Rivas, Patricia Claudia
Taylor, Marcela Andrea
Pasquevich, Alberto Felipe
De Sanctis, O. A.
Thermal evolution of CaO-doped HfO2 films and powders
topic_facet Ciencias Exactas
Evolución termal
Solución
Física del estado sólido
description Solid solutions of ZrO2 and HfO2 are potential electrolyte materials for intermediate-temperature SOFC because both are oxygen-ion conductors. The main challenge for these compounds is to reduce the relatively high value of the activation energies vacancies diffusion, which is influenced by several factors. In this work the thermal evolution of CaO-HfO2 materials have been investigated. (CaO)y-Hf(1-y)O(2-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. By means Glazing Incidence X-ray Diffraction (ρ-2θ configuration) the phases were studied in the annealed films. On the other hand, the thermal evolution and crystallization process of powders were analyzed in-situ by HT-XRD. The phenomena crystallization occurred in films and powders were analyzed. The activation energies of diffusion of oxygen vacancies of HfO2-14 mole% CaO and HfO2-20 mole% CaO films were measured from the thermal evolution of the relaxation constant measured by Perturbed Angular Correlation Technique.
format Articulo
Articulo
author Barolin, S. A.
Caracoche, María Cristina
Martínez, Jorge Alberto
Rivas, Patricia Claudia
Taylor, Marcela Andrea
Pasquevich, Alberto Felipe
De Sanctis, O. A.
author_facet Barolin, S. A.
Caracoche, María Cristina
Martínez, Jorge Alberto
Rivas, Patricia Claudia
Taylor, Marcela Andrea
Pasquevich, Alberto Felipe
De Sanctis, O. A.
author_sort Barolin, S. A.
title Thermal evolution of CaO-doped HfO2 films and powders
title_short Thermal evolution of CaO-doped HfO2 films and powders
title_full Thermal evolution of CaO-doped HfO2 films and powders
title_fullStr Thermal evolution of CaO-doped HfO2 films and powders
title_full_unstemmed Thermal evolution of CaO-doped HfO2 films and powders
title_sort thermal evolution of cao-doped hfo2 films and powders
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82752
work_keys_str_mv AT barolinsa thermalevolutionofcaodopedhfo2filmsandpowders
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bdutipo_str Repositorios
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