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Electric Field Effects During Solidification of the Ternary Oxide Eutectic Al 2 O 3 ‐YAG‐ZrO 2
Author(s) -
Cherif M.,
Hicher P.,
Benamara O.,
Lebbou K.,
Haumont R.,
Duffar T.
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201700251
Subject(s) - eutectic system , electric field , materials science , microstructure , ternary operation , field (mathematics) , phase diagram , oxide , relaxation (psychology) , ion , zirconium , condensed matter physics , analytical chemistry (journal) , phase (matter) , metallurgy , chemistry , physics , psychology , social psychology , mathematics , organic chemistry , chromatography , quantum mechanics , computer science , pure mathematics , programming language
LHPG and zone melting solidification of Al 2 O 3 ‐YAG‐ZrO 2 :Y eutectic samples is performed in order to investigate intrinsic and extrinsic electric field phenomena. An intrinsic electric field is measured during solidification. Its decay with distance from the interface, and its relaxation with time, show that it is induced by the accumulation of positive electric charges at the solid‐liquid interface, that diffuse away when pulling is stopped. Under extrinsic electric field, a significant modification of the eutectic phase diagram is observed. The charged diffusive boundary layer interacts with the field and the microstructure is impacted. Those observations suggest that the segregating species is zirconium ions.