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Compositional Effects on the Liquid‐Phase Sintering of Praseodymium Oxide‐Based Zinc Oxide Varistors
Author(s) -
Alles Aldo B.,
Puskas Robert,
Callahan Gregory,
Burdick Ver L.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb08339.x
Subject(s) - varistor , sintering , materials science , eutectic system , praseodymium , microstructure , zinc , oxide , ternary operation , phase (matter) , metallurgy , ball mill , liquid phase , chemical engineering , chemistry , thermodynamics , physics , organic chemistry , quantum mechanics , voltage , computer science , engineering , programming language
The influence of the formation of eutectic liquid phases during sintering of the ternary varistor system ZnO‐Pr 6 O 11 ‐Co 3 O 4 was studied. The temperature at which the samples were observed to be liquid‐phase sintered was found to depend on the nominal batch composition. The appearance of the liquid phase had a significant effect on the final microstructure as well as on the electrical properties of the varistors. Small additions of ZrO 2 , purposely added or resulting from ball‐mill contamination, were found to affect moderately the properties of the liquid phases observed in this system.