Large Nonclassical Electrostriction in (Y, Nb)-Stabilized δ-Bi2O3

Nimrod Yavo, Alaric D. Smith, Ori Yeheskel, Sydney Cohen, Roman Korobko, Ellen Wachtel, Peter R. Slater, Igor Lubomirsky

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Classical electrostriction, describing a second-order electromechanical response of insulating solids, scales with elastic compliance, S, and inversely with dielectric susceptibility, ε. This behavior, first noted 20 years ago by Robert Newnham, is shown to apply to a wide range of electrostrictors including polymers, glasses, crystalline linear dielectrics, and relaxor ferroelectrics. Electrostriction in fluorite ceramics of (Y, Nb)-stabilized δ-Bi2O3 is examined with 16%-23% vacant oxygen sites. Given the values of compliance and dielectric susceptibility, the electrostriction coefficients are orders of magnitude larger than those expected from Newnham's scaling law. In ambient temperature nanoindentation measurements, (Y, Nb)-stabilized δ-Bi2O3 displays primary creep. These findings, which are strikingly similar to those reported for Gd-doped ceria, support the suggestion that ion conducting ceramics with the fluorite structure, a large concentration of anion vacancies and anelastic behavior, may constitute a previously unknown class of electrostrictors.

Original languageEnglish
Pages (from-to)1138-1142
Number of pages5
JournalAdvanced Functional Materials
Issue number7
Publication statusPublished - Feb 16 2016


  • delta-phase bismuth oxide
  • elasticity
  • electrostriction
  • point defects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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