High temperature creep-mediated functionality in polycrystalline barium titanate

Pengrong Ren, Marion Höfling*, Jurij Koruza, Stefan Lauterbach, Xijie Jiang, Till Frömling, Dipak Kumar Khatua, Christian Dietz, Lukas Porz, Rajeev Ranjan, Hans Joachim Kleebe, Jürgen Rödel

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Dislocations in oxides can be described as charged line defects and means for one-dimensional doping, which can tune electrical and thermal properties. Furthermore, theoretically it was shown that dislocations can pin ferroelectric domain walls. Broader application of this concept hinges on the development of a methodology to avail this approach to polycrystalline ceramics. To this end, we use different creep mechanisms as a method to introduce multidimensional defects and quantify structural changes. A deformation map for fine-grained barium titanate is provided and the influences of the defects and creep regimes are correlated in this first study to modifications of electrical conductivity, dielectric, ferroelectric, and piezoelectric properties. A plastic deformation of 1.29% resulted in an increase in the Curie temperature by 5°C and a decrease in electromechanical strain by 30%, pointing toward electromechanical hardening by dislocations.

Originalspracheenglisch
Seiten (von - bis)1891-1902
Seitenumfang12
FachzeitschriftJournal of the American Ceramic Society
Jahrgang103
Ausgabenummer3
DOIs
PublikationsstatusVeröffentlicht - 1 März 2020

ASJC Scopus subject areas

  • Keramische und Verbundwerkstoffe
  • Werkstoffchemie

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