Premium
Preparation of Ca 3 Co 4 O 9 and Improvement of its Thermoelectric Properties by Spark Plasma Sintering
Author(s) -
Liu Yuheng,
Lin Yuanhua,
Shi Zhan,
Nan CeWen,
Shen Zhijian
Publication year - 2005
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.1551-2916.2005.00284.x
Subject(s) - spark plasma sintering , materials science , sintering , thermoelectric effect , calcination , ceramic , thermogravimetric analysis , analytical chemistry (journal) , electrical resistivity and conductivity , thermoelectric materials , seebeck coefficient , oxide , relative density , thermal conductivity , differential thermal analysis , diffraction , mineralogy , chemical engineering , metallurgy , composite material , chemistry , biochemistry , physics , electrical engineering , optics , chromatography , engineering , catalysis , thermodynamics
The precursor powders of Ca 3 Co 4 O 9 were synthesized by a sol–gel method. The results of X‐ray diffraction and thermogravimetric and differential thermal analyses patterns indicate that pure Ca 3 Co 4 O 9 powders could be obtained by calcining the precursor at 800°C for 2 h. High dense Ca 3 Co 4 O 9 ceramic samples (∼99% of theoretical density) were prepared by the spark plasma sintering (SPS) method. Compared with the conventional sintering (CS), the SPS samples exhibit much higher electrical conductivity and power factor which are respectively about 118 S/cm and 3.51 × 10 −4 W·(m·K 2 ) −1 . The SPS method is greatly effective for improving the thermoelectric properties of Ca 3 Co 4 O 9 oxide ceramics.