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Improvement in Thermoelectric Characteristics of n‐type Iron Disilicide by Local Composition Modification
Author(s) -
Tokiai Takeo,
Uesugi Takashi,
Koumoto Kunihito
Publication year - 1995
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.1151-2916.1995.tb08444.x
Subject(s) - materials science , microstructure , sintering , metallurgy , annealing (glass) , thermoelectric effect , figure of merit , ceramic , grain boundary , cobalt , mineralogy , chemistry , physics , optoelectronics , thermodynamics
High thermoelectric figure of merit semiconducting ceramics of n ‐type iron disilicide with modified local compositions have been developed. Sintering and annealing of the composite powder composed of iron disilicide and precipitated cobalt (II) hydroxide resulted in the dissolution of excess Co and oxygen into the iron disilicide phase. Excess Co segregated to the grain boundary region, while interstitially incorporated oxygen was distributed homogeneously in the microstructure. The maximum figure of merit achieved was 5.2 × 10 −4 /K at 673 K.