An electrical current upon flash sintering experiments modifies the defect chemistry of corundum and causes the formation of color centers (F-centers), consisting of discharged oxygen vacancies. This phenomenon interacts with the diffusion kinetics in the anodic region and promotes abnormal growth of some grains which reach several hundreds of micrometers in just few minutes, the grains being strongly oriented orthogonally to the current flow. © 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Current-induced abnormal and oriented grain growth in corundum upon flash sintering / Biesuz, Mattia; Sglavo, Vincenzo M.. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 2018, 150:(2018), pp. 82-86. [10.1016/j.scriptamat.2018.03.004]
Current-induced abnormal and oriented grain growth in corundum upon flash sintering
Biesuz, Mattia;Sglavo, Vincenzo M.
2018-01-01
Abstract
An electrical current upon flash sintering experiments modifies the defect chemistry of corundum and causes the formation of color centers (F-centers), consisting of discharged oxygen vacancies. This phenomenon interacts with the diffusion kinetics in the anodic region and promotes abnormal growth of some grains which reach several hundreds of micrometers in just few minutes, the grains being strongly oriented orthogonally to the current flow. © 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.| File | Dimensione | Formato | |
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