Extended x-ray absorption fine structure spectroscopy and x-ray absorption near edge spectroscopy study of aliovalent doped ceria to correlate local structural changes with oxygen vacancies clustering

Journal Article · Mon Apr 04 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4945098· OSTI ID:22591542

Shirbhate, S. C.; Yadav, A. K. ^[1]

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1. Atomic and molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

This study provides atomic scale insight to understand the role of aliovalent dopants on oxygen vacancies clustering and dissociation mechanism in ceria system in order to enhance the performance of oxy-ion conductor. Dopants induced microscale changes in ceria are probed by extended X-ray absorption fine structure spectroscopy, X-ray absorption near edge spectra, and Raman spectroscopy. The results are explored to establish a correlation between atomic level structural changes (coordination number, interatomic spacing) → formation of dimer and trimer type cation-oxygen vacancies defect complex (intrinsic and extrinsic) → dissociation of oxygen vacancies from defect cluster → ionic conductivity temperature. It is a strategic approach to understand key physics of ionic conductivity mechanism in order to reduce operating temperature of electrolytes for intermediate temperature (300–450 °C) electrochemical devices for the first time.

• OSTI ID: 22591542
• Journal Information: Applied Physics Letters, Vol. 108, Issue 14; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ABSORPTION SPECTROSCOPY
CATIONS
CERIUM OXIDES
COORDINATION NUMBER
DEFECTS
DISSOCIATION
DOPED MATERIALS
ELECTROCHEMISTRY
ELECTROLYTES
EQUIPMENT
FINE STRUCTURE
IONIC CONDUCTIVITY
OXYGEN
RAMAN SPECTROSCOPY
X-RAY SPECTROSCOPY