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Title: Multicycle flash sintering of cubic Y2O3-stabilized ZrO2: An in situ energy dispersive synchrotron x-ray diffraction study with high temporal resolution
Authors: Biçer, Hülya
Degnah, Ahmed
Salur, Emin
Şavklıyıldız, İlyas
Tsakalakos, Thomas
Akdoğan, E.Koray
Keywords: Diffusion
Energy dispersive x-ray diffraction
Flash sintering
Lattice expansion
Synchrotron diffraction
Full width at half maximum
Solid electrolytes
Synchrotron radiation
Thermal expansion
Yttria stabilized zirconia
Yttrium oxide
Applied field
Energy dispersive
Energy dispersive x-ray diffractions
Energy-dispersive X-ray diffraction
Flash sintering
Full widths at half maximums
Lattice expansion
Multi cycle
Synchrotron diffraction
Unit-cell volume
X ray diffraction
Issue Date: 2022
Publisher: Elsevier Ltd
Abstract: The current induced unit cell volume changes, (111) Bragg peak full width at half maximum (FWHM) and its integrated intensity in 8 % Y2O3 stabilized ZrO2 (8 %YSZ) solid state electrolyte was monitored during a triple-flash sintering experiment by in situ energy dispersive x-ray diffraction using a polychromatic synchrotron probe (max, photon energy 200 keV) with 2 second temporal resolution. The first spontaneous singularity in the unit cell volume (+0.54 %) was observed at 899 °C under 15 V/mm applied field intensity, which was associated with 13 mA/mm2 current draw and an increase in density to 97 %. Following anelastic relaxation of the unit cell volume under open circuit conditions, the same applied field was applied twice in a row which resulted in additional induced singularities at 925 °C (+0.48 %) and 944 °C (+0.42 %). A floating baseline, which was above the thermal expansion baseline, was observed from 833 to 969 °C and was attributed to Joule heating. The singularity at 899 °C is associated with a sharp change in (111) FWHM and a 34 % decrease in integrated peak area that was attributed to changes in the distribution of oxygen vacancies and the changes in their concentration as induced by the applied field in the spontaneous transient stage of flash sintering. © 2022 Elsevier Ltd
ISSN: 2352-4928
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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