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Spark Plasma Sintering of n‐Type Thermoelectric Ca 0.95 Sm 0.05 MnO 3
Author(s) -
Noudem Jacques G.,
Kenfaui Driss,
QuetelWeben Simon,
Sanmathi Chavalmane S.,
Retoux Richard,
Gomina Moussa
Publication year - 2011
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.1551-2916.2011.04465.x
Subject(s) - spark plasma sintering , nanoceramic , materials science , sintering , coprecipitation , thermoelectric effect , ceramic , grain size , thermoelectric materials , metallurgy , mineralogy , composite material , chemical engineering , thermal conductivity , chemistry , thermodynamics , physics , engineering
Nanoceramic powders of n ‐type Ca 0.95 Sm 0.05 MnO 3 (CSM) were synthesized by the coprecipitation method. Spark plasma sintering (SPS) technique was successfully used to densify granular n ‐type CSM oxides and control their nanostructure. Thermoelectric (TE) properties were measured and their dependence upon processing conditions was evidenced. SPS enables rapid sintering and better TE properties due to the strong densification and the grain size control. The power factor reached 306 μW·(m·K 2 ) −1 at 600°C. These results contrast with those obtained by the conventional sintering (CS) method, where only 228 μW·(m·K 2 ) −1 obtained at the same temperature. The mechanical properties of granular n ‐type CSM ceramics processed by SPS and CS were also investigated and compared.