Title :
Synthesis of β"-Al2O3 polymer precursor and its pyrolysis to ultrafine β"-Al2O3 powders [AMTEC applications]
Author :
Treadwell, David R. ; Sutorik, Anthony C. ; Neo, Siew Siang ; Laine, Richard M. ; Svedberg, Robert C.
Author_Institution :
Dept. of Mater. Sci. & Eng., Michigan Univ., Ann Arbor, MI, USA
fDate :
27 Jul-1 Aug 1997
Abstract :
β"-alumina, an important high-temperature solid electrolyte for alkali metal thermoelectric conversion (AMTEC) applications, was synthesized in ultrafine particle form from inexpensive starting materials via a polymeric, metalloorganic precursor. The precursor, made by reacting NaOH, LiOH, and Al(OH)3 with triethanolamine (TEA) in ethylene glycol (EG) while distilling off product water, is a glassy thermoplastic at room temperature, and dissolves in polar solvents, e.g. ethanol. Spheroidal, nonagglomerated particles of <100 nm diameter were formed by flame-spray pyrolysis of ethanolic solutions of the precursor. X-ray powder diffraction showed the as-formed powders to be an intermediate phase which transforms to β"-alumina upon heating above 1000°C
Keywords :
X-ray diffraction; alkali metals; alumina; electrochemistry; powders; pyrolysis; solid electrolytes; thermoelectric conversion; β"-alumina synthesis; Al2O3; X-ray powder diffraction; alkali metal thermoelectric conversion; flame-spray pyrolysis; glassy thermoplastic; high-temperature solid electrolyte; intermediate phase; polymeric metalloorganic precursor; ultrafine particle form; Anti-freeze; Ethanol; Inorganic materials; Polymers; Powders; Solids; Solvents; Temperature; Thermoelectricity; X-ray diffraction;
Conference_Titel :
Energy Conversion Engineering Conference, 1997. IECEC-97., Proceedings of the 32nd Intersociety
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-4515-0
DOI :
10.1109/IECEC.1997.661941
