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

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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.

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Bicer, H., Beyoglu, B., Ozdemir, T. E., Okasinski, J., & Tsakalakos, T. (2019). Direct in situ observation of electric field assisted densification of ZnO by energy dispersive X-ray diffraction. Ceramics International, 45(6), 7614–7618. https://doi.org/10.1016/j.ceramint.2019.01.057

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