Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Electrical properties of nanometric CGO-thin films prepared by electron-beam physical vapour deposition
Year:2014
Research Areas
  • Physics chemical and mathematical
Information
Abstract
Thin-film oxide-ion-conducting electrolytes are of considerable interest for the development of microsolid oxide fuel cells (m-SOFCs). In this study, nanocrystalline CGO thin films (with thickness ranging from 0.3 to 1.35 mm) were deposited from a Ce0.9Gd0.1O2?d target by electron-beam physical vapour deposition onto a selection of substrates (Si, glass, fused silica and Al2O3) which were either maintained at room temperature or at 700 ?C during deposition. Films have a columnar microstructure with (111) texture in the surface plane. The crystallinity of the films deposited at a substrate temperature of 700 ?C was found to be much superior to those deposited at RT and subsequently heated. Impedance spectroscopy revealed that the in-plane resistivity of the films in air at 900 ?C is greater than that of bulk CGO by around two orders of magnitude, with this difference increasing with decreasing temperature. The poor electrical properties of the nanocrystalline films may be considerably affected by the expected higher concentration of strains in comparison with the micrometric sample. The composition of the thin films was also affected by a de-doping process. The in-plane charge transport in films is limited by grain boundaries, mainly due to both a greater grain-boundary volume and higher specific grain-boundary resistivity. Conductivity measurements as a function of oxygen partial pressure reveal a considerably narrower electrolytic domain for the thin films than that of bulk CGO.
International
Si
JCR
Si
Title
Journal of Materials Chemistry A
ISBN
0959-9428
Impact factor JCR
5,968
Impact info
Datos JCR del año 2011
Volume
2
10.1039/c3ta15274j
Journal number
From page
7410
To page
7420
Month
SIN MES
Ranking
Participants
  • Autor: Domingo Perez-Coll
  • Autor: Eva Cespedes
  • Autor: Antonio Juan Dos Santos Garcia (UPM)
  • Autor: G. C. Mather
  • Autor: C. Prieto
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Análisis y Caracterización Óptica de Materiales
  • Departamento: Ingeniería Mecánica, Química y Diseño Industrial
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)