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Title: In-situ extended X-ray absorption fine structure study of electrostriction in Gd doped ceria

Studying electric field-induced structural changes in ceramics is challenging due to the very small magnitude of the atomic displacements. We used differential X-ray absorption spectroscopy, an elementally specific and spatially sensitive method, to detect such changes in Gd-doped ceria, recently shown to exhibit giant electrostriction. We found that the large electrostrictive stress generation can be associated with a few percent of unusually short Ce-O chemical bonds that change their length and degree of order under an external electric field. The remainder of the lattice is reduced to the role of passive spectator. This mechanism is fundamentally different from that in electromechanically active materials currently in use.
Authors:
; ;  [1] ; ; ;  [2]
  1. Department of Materials and Interfaces, Weizmann Institute of Science, 234 Herzl Street, Rehovot 76100 (Israel)
  2. Physics Department, Yeshiva University, 245 Lexington Avenue, New York, New York 10016 (United States)
Publication Date:
OSTI Identifier:
22415202
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION SPECTROSCOPY; CERAMICS; CERIUM OXIDES; DOPED MATERIALS; ELECTRIC FIELDS; GADOLINIUM; X RADIATION; X-RAY SPECTROSCOPY