Journal Article

FZJ-2026-04419

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png From Fluorite to Pyrochlore: Linking Structure and Redox-Active Cations to Transport Properties in Rare-Earth Oxides

Mowe, P. (First author)FZJ* ; Glück, H. ; Jüstel, T. ; Winter, M.FZJ* ; Neuhaus, K. (Corresponding author)FZJ*

2026
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2026.190998  doi:10.34734/FZJ-2026-04419

Abstract: Due to their unique structural and electronic properties, acceptor-doped ceria and zirconia materials with thegeneral formula A^(3+)_2B^(4+)_2O_7 are promising candidates for electronic and energy applications. Using La2Ce2O7 as a benchmark, this study investigates the relationship between structural motifs and electronic behavior of cerates and zirconates containing Pr as an (additional) redox-active species. Structural analysis was performed using X-ray diffraction and Raman spectroscopy revealing disordered fluorites for Pr2Ce2O7 and La2Ce2O7 with an increasingly ordered structure for LaPrCeZrO7 and Pr2Zr2O7 having a pyrochlore structure. Using a micro-contact Hebb-Wagner method alongside electrochemical impedance spectroscopy (EIS) in various atmospheres providedprecise information about the partial electronic, proton, and oxygen ion conductivities. The results reveal clearcorrelations between structural features and transport properties with materials containing Ce and Pr showing markedly increased electrical conductivity. Pr₂Zr₂O₇ exhibits the highest proton transference number among comparable materials below 500 ◦C, underlining its potential for low- to intermediate-temperature proton-conducting applications.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IMD-4)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. DFG project G:(GEPRIS)523164409 - Protonenleitfähigkeit bei Raumtemperatur in hydratisierten Pyrochlor-Materialien (523164409) (523164409)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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