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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1891-1902
Number of pages12
JournalJournal of the American Ceramic Society
Issue number3
Publication statusPublished - 1 Mar 2020


  • barium titanate
  • creep
  • dislocations
  • ferroelectricity/ferroelectric materials
  • piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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