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Power Generation of a p ‐Type Ca 3 Co 4 O 9 / n ‐Type CaMnO 3 Module
Author(s) -
Urata Saori,
Funahashi Ryoji,
Mihara Toshiyuka,
Kosuga Atsuko,
Sodeoka Satoshi,
Tanaka Takahiro
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02173.x
Subject(s) - materials science , electrical resistivity and conductivity , substrate (aquarium) , atmospheric pressure , hot isostatic pressing , analytical chemistry (journal) , oxide , hot pressing , sintering , electrode , metallurgy , electrical engineering , chemistry , physics , oceanography , engineering , chromatography , meteorology , geology
Thermoelectric modules composed of eight pairs of p ‐type Ca 2.7 Bi 0.3 Co 4 O 9 (Co‐349) and n ‐type CaMn 0.98 Mo 0.02 O 3 (Mn‐113) bulks were constructed using Ag electrodes and paste including powder of the n ‐type oxide. The former bulks were prepared by hot pressing. On the other hand, the latter were densified using a cold isostatic pressing technique and sintered in atmospheric pressure. Dimensions of both oxide legs were 5 mm wide and thick and 4.5 mm high. An alumina plate was used as a substrate, and there was no alumina plate on the other side of the modules. When the substrate side was heated, the module could generate up to 1.0 V and 0.17 W of open circuit voltage ( V O ) and maximum power ( P max ), respectively, at a hot‐side temperature of 1273 K (furnace temperature as a heat source) and a cold‐side temperature of 298 K (circulated water temperature) in air. But internal resistance R I reached a value of 1.5 Ω, which is about six times higher than the calculated one from resistivity of both p ‐ and n ‐type bulks. When the substrate side was cooled, V O and P max reached 0.7 V and 0.34 W of V O and P max , respectively, at a furnace temperature of 1273 K.