%0 Journal Article
%A Mishra, Tarini Prasad
%A Neto, Rubens Roberto Ingraci
%A Raj, Rishi
%A Guillon, Olivier
%A Bram, Martin
%T Current-rate flash sintering of gadolinium doped ceria: Microstructure and Defect generation
%J Acta materialia
%V 189
%@ 1359-6454
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2020-02579
%P 145 - 153
%D 2020
%X In current-rate flash-sintering experiments the current is injected into the specimen from the very start and then increased at a constant rate, while the furnace is held at a constant temperature. The power supply remains under current control. The flash is induced at low current densities which reduces local heating at the electrodes. It leads to a uniform grain size across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria flash sintered at current-rates ranging from 50 mA min−1 to 1000 mA min−1 at a furnace temperature of 680 °C. Full densities are obtained at a current density limit of 200 mA mm–2. Densification is shown to depend only on the instantaneous value of the current density, and not on the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the “energy deficit”, that is, the estimated power input corresponding to the temperature as measured with a pyrometer, and the actual power consumption, estimates that huge concentrations of Frenkel defects may be introduced in the flash process.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000527829900013
%R 10.1016/j.actamat.2020.02.036
%U https://juser.fz-juelich.de/record/878010