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Processing and thermal properties of mayenite electride
Author(s) -
Mackey Jon,
Back Tyson,
Berger MarieHélène,
Sayir Ali
Publication year - 2021
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/jace.17646
Subject(s) - thermal diffusivity , materials science , thermal conductivity , graphite , thermal expansion , thermal , phase (matter) , thermodynamics , chemical physics , composite material , chemical engineering , chemistry , organic chemistry , physics , engineering
A mayenite‐based electride is being considered for field emitter applications where it will be critical to have a good understanding of processing repeatability and thermal properties. This paper focuses on the details of processing of mayenite compounds in a strongly reducing graphite environment to form an electride solid‐solution phase as Ca 12 Al 14 O 32 (C 2 ,O 2 ) 1‐x (e 2 ) x . The work reports, in addition to processing details, several thermal properties. The electride phase was found to have coefficient of thermal expansion (CTE) of 7e‐6 K −1 , thermal diffusivity between 0.0063 and 0.0102 cm 2 /s, and thermal conductivity between 1.9 and 3.1 W m −1 K −1 . Rattling motion of O 2− or C 2 2− ions in cage structure has been suggested to explain low thermal conductivity of the electride phase.