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Title: Influence of gadolinium doping on the structure and defects of ceria under fuel cell operating temperature

Correlation between atomic positional shift, oxygen vacancy defects, and oxide ion conductivity in doped ceria system has been established in the gadolinium doped ceria system from X-ray diffraction (XRD) and Raman spectroscopy study at operating temperature (300–600 °C) of Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). High temperature XRD data are used to quantify atomic positional shift from mean position with temperature. The Raman spectroscopy study shows additional vibration modes related to ordering of defect spaces (Gd{sub Ce}{sup ′}−V{sub o}{sup ••}){sup *} and (2Gd{sub Ce}{sup ′}−V{sub o}{sup ••}){sup x} generated due to association of oxygen vacancies and reduced cerium or dopant cations site (Gd{sup 3+}), which disappear at 450 °C; indicating oxygen vacancies dissociation from the defect complex. The experimental evidences of cation-anion positional shifting and oxygen vacancies dissociation from defect complex in the IT-SOFC operating temperature are discussed to correlate with activation energy for ionic conductivity.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, RTM Nagpur University, Nagpur 440033, MS (India)
  2. UGC-DAE-CSR, University Campus, Khandwa Road, Indore 452001 (India)
  3. Indian Institute of Science Education and Research, Pune 411008 (India)
Publication Date:
OSTI Identifier:
22257712
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATIONS; CERIUM OXIDES; DOPED MATERIALS; GADOLINIUM IONS; RAMAN SPECTROSCOPY; SOLID OXIDE FUEL CELLS; VACANCIES; X-RAY DIFFRACTION