Journal Article

FZJ-2020-02950

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The grain‐boundary resistance of CeO 2 ceramics: A combined microscopy‐spectroscopy‐simulation study of a dilute solution

Parras, J. P. (Corresponding author) ; Cao, C.FZJ* ; Ma, Z.FZJ* ; Mücke, R.FZJ* ; Jin, L.FZJ* ; Dunin‐Borkowski, R. ; Guillon, O.FZJ* ; De Souza, R. A.

2020
Soc. Westerville, Ohio

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Please use a persistent id in citations: http://hdl.handle.net/2128/25553  doi:10.1111/jace.16843

Abstract: Weakly acceptor‐doped ceria ceramics were characterized structurally and compositionally with advanced transmission electron microscopy (TEM) techniques and electrically with electrochemical impedance spectroscopy (EIS). The grain boundaries studied with TEM were found to be free of second phases. The impedance spectra, acquired in the range 703 ≤ T/K ≤ 893 in air, showed several arcs that were analyzed in terms of bulk, grain‐boundary, and electrode responses. We ascribed the grain‐boundary resistance to the presence of space‐charge layers. Continuum‐level simulations were used to calculate charge‐carrier distributions (of acceptor cations, oxygen vacancies, and electrons) in these space‐charge layers. The acceptor cations were assumed to be mobile at high (sintering) temperatures but immobile at the temperatures of the EIS measurements. Space‐charge formation was assumed to be driven by the segregation of oxygen vacancies to the grain‐boundary core. Comparisons of data from the simulations and from the EIS measurements yielded space‐charge potentials and the segregation energy of vacancies to the grain‐boundary core. The space‐charge potentials from the simulations are compared with values obtained by applying the standard, analytical (Mott–Schottky and Gouy–Chapman) expressions. The importance of modelling space‐charge layers from the thermodynamic level is demonstrated.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. DFG project 274005202 - SPP 1959: Manipulation of matter controlled by electric and magnetic fields: Towards novel synthesis and processing routes of inorganic materials (274005202) (274005202)
3. DFG project 319339707 - Diffusionsgesteuerte Prozesse in polykristallinem Ceroxid: Kombinierte Wirkung von elektrischem Feld und mechanischer Belastung (319339707)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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