Processing and thermal properties of mayenite electride |
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| Authors: | Jon Mackey Tyson Back Marie-Hélène Berger Ali Sayir |
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| Affiliation: | 1. NASA Glenn Research Center, Cleveland, OH, USA;2. Materials and Manufacturing Directorate, Air Force Research Laboratory, WPAFB, Wright-Patterson AFB, OH, USA;3. MINES ParisTech, PSL University, Centre des matériaux, CNRS UMR 7633, Evry, France;4. Air Force Office of Scientific Research, Arlington, VI, USA |
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| Abstract: | 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 Ca12Al14O32(C2,O2)1-x(e2)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 cm2/s, and thermal conductivity between 1.9 and 3.1 W m?1 K?1. Rattling motion of O2? or C22? ions in cage structure has been suggested to explain low thermal conductivity of the electride phase. |
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| Keywords: | cathode materials electroceramics processing thermal properties |
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