Title :
Preparation and thermoelectric properties of Ca3Co2O6 ceramic bulk
Author :
Lu, Q.M. ; Zhang, J.X. ; Liu, Y.Q. ; Liu, D.M. ; Zhou, M.L.
Author_Institution :
Coll. of Mater. Sci. & Eng., Beijing Univ. of Technol., China
Abstract :
Short-time solid-state reaction and spark plasma sintering method (SS-SPS) were combined to prepare single-phase polycrystalline Ca3Co2O6 ceramic bulk, and effects of preparation condition and sintering technology were investigated in detail. Single-phase polycrystalline Ca3Co2O6 powders with dendritic grains of about 1-3 μm and Ca3Co2O6 ceramic bulk with grain size of about 2 μm were obtained respectively under 950°C for 2 h in the solid reaction process and spark plasma sintering under 900°C for 5 min. The ZT values of the polycrystalline product tend to increase sharply with increasing temperature and is 0.02 at 700°C, it is expected to possess high conversion efficiency and is considered to be a potential candidate for use as a thermoelectric materials at high temperatures.
Keywords :
calcium compounds; ceramics; dendrites; dendritic structure; grain size; plasma materials processing; powders; sintering; thermoelectric conversion; thermoelectricity; 1 to 3 mum; 2 h; 5 min; 700 degC; 900 degC; 950 degC; Ca3Co2O6; ZT values; ceramic bulk; dendritic grains; grain size; high conversion efficiency; preparation condition; short-time solid-state reaction; single-phase polycrystalline powders; sintering technology; solid reaction process; spark plasma sintering; thermoelectric materials; thermoelectric properties; Ceramics; Crystalline materials; Materials science and technology; Plasma temperature; Solid state circuits; Sparks; Tellurium; Temperature distribution; Thermal conductivity; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2005. ICT 2005. 24th International Conference on
Print_ISBN :
0-7803-9552-2
DOI :
10.1109/ICT.2005.1519881
