Direct in situ observation of electric field assisted densification of ZnO by energy dispersive X-ray diffraction

Hulya Bicer, Berra Beyoglu, T. Ertugrul Ozdemir, John Okasinski, Thomas Tsakalakos

Research output: Contribution to journalArticle

Abstract

Electric field assisted sintering techniques are used to enhance the densification process, reducing sintering time and temperature. Here, we report the in situ characterization of non-isothermal densification behavior of zinc oxide under simultaneous application of thermal and electric field by energy dispersive X-ray diffraction. 99% density was achieved under the electric field of 50 V/mm in the 588–843 °C range in a short time without grain growth. The in-situ energy dispersive X-ray diffraction study revealed the abnormal volumetric unit cell expansion of 0.9% at 843 °C associated with the observed sudden rise of the power absorption by the specimen during densification. Moreover, the variation in peak broadening as a function of time exhibited singularity in the 588–843 °C range implying the formation and rearrangement of defects correlated with densification during electric field assisted sintering.

Original languageEnglish (US)
Pages (from-to)7614-7618
Number of pages5
JournalCeramics International
Volume45
Issue number6
DOIs
StatePublished - Apr 15 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Keywords

  • Flash
  • Sintering
  • ZnO
  • in situ diffraction

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