Direct in situ observation of electric field assisted densification of ZnO by energy dispersive X-ray diffraction. Issue 6 (15th April 2019)

• Record Type: Journal Article
• Authors: Bicer, Hulya; Beyoglu, Berra; Ozdemir, T. Ertugrul; Okasinski, John; Tsakalakos, Thomas
• Is Part Of: Ceramics international. Volume 45:Issue 6(2019)
• Page Start: 7614
• Page End: 7618
• Publication Date: 2019-04-15
• Subjects: Flash -- ZnO -- Sintering -- in situ diffraction; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.01.057
• Languages: English
• ISSNs: 0272-8842

Abstract

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.