Geometry of electromechanically active structures in Gadolinium - Doped Cerium oxides

Yuanyuan Li, Olga Kraynis, Joshua Kas, Tsu Chien Weng, Dimosthenis Sokaras, Renee Zacharowicz, Igor Lubomirsky, Anatoly I. Frenkel

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33 Scopus citations


Local distortions from average structure are important in many functional materials, such as electrostrictors or piezoelectrics, and contain clues about their mechanism of work. However, the geometric attributes of these distortions are exceedingly difficult to measure, leading to a gap in knowledge regarding their roles in electromechanical response. This task is particularly challenging in the case of recently reported non-classical electrostriction in Cerium-Gadolinium oxides (CGO), where only a small population of Ce-O bonds that are located near oxygen ion vacancies responds to external electric field. We used high-energy resolution fluorescence detection (HERFD) technique to collect X-ray absorption spectra in CGO in situ, with and without an external electric field, coupled with theoretical modeling to characterize three-dimensional geometry of electromechanically active units.

Original languageEnglish
Article number055320
JournalAIP Advances
Issue number5
StatePublished - 1 May 2016
Externally publishedYes

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