Steady Non-classical Giant Electrostriction in Calcium Doped Cerium Oxide

Ahsanul Kabir, Vincenzo Esposito

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

9 Downloads (Pure)

Abstract

In recent times, rare-earth-doped cerium oxides, e.g. Gd-doped ceria have shown giant electrostriction that are orders of magnitude higher than known inorganic electrostrictors. This non-classical electrostriction is fundamentally independent of Newnham's scaling law and is functioned with the existence of oxygen vacancies (Vo) in the host lattice, associated with Ce-Vo pairs. Here, electro-chemo-mechanical properties of highly defective calcium doped ceria (CDC) ceramics, with variously doping levels (Ce0.9CaxO2-x,x = 0.025-0.15) are investigated. As expected, CDC samples display rather different electrochemical properties depending on a vacancy concentration and microstructure. They reveal primary creep at room temperature, emphasizing an unexpected anelasticity in ceria. The electrostrictive effect describes being independent of either the nominal vacancy concentration or the related blocking effects at the grain boundary, exhibiting a high electrostriction coefficient (M33) in order of ≈ 10-18 m2V-2 in a wide range of frequency. Remarkably, electrostriction show neither strain saturation nor relaxation with field amplitude and frequencies, respectively. These key findings unveil a new form of electromechanical response in ceria that is independent of composition fluctuations and dominated by strong columbic and elastic energy of Ca2+- Vo pairs.
Original languageEnglish
Publication date2020
Number of pages2
Publication statusPublished - 2020
Event44th International Conference and Expo on Advanced Ceramics and Composites - Hilton Daytona Beach Resort and Ocean Center, Daytona, United States
Duration: 26 Jan 202031 Jan 2020
Conference number: 44
https://ceramics.org/event/44th-international-conference-and-expo-on-advanced-ceramics-and-composites-icacc-2020-archive

Conference

Conference44th International Conference and Expo on Advanced Ceramics and Composites
Number44
LocationHilton Daytona Beach Resort and Ocean Center
CountryUnited States
CityDaytona
Period26/01/202031/01/2020
Internet address

Keywords

  • Giant Electrostriction
  • Oxygen defects
  • Blocking barrier
  • Anelasticity

Fingerprint

Dive into the research topics of 'Steady Non-classical Giant Electrostriction in Calcium Doped Cerium Oxide'. Together they form a unique fingerprint.

Cite this