WHISKER CRYSTAL OF LAYERED COBALT OXIDE NaxCoO2 HAVING THERMOELECTRIC CONVERSION CHARACTERISTIC AND METHOD OF PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To orient a crystal for obtaining, to the utmost, characteristics which originate in the crystal structure having large electromagnetic anisotropy of the layered cobalt oxide Na_xCoO₂ having high thermoelectric conversion efficiency stable at high temperatures.;SOLUTION: The whisker crystal of the layered cobalt oxide Na_xCoO₂ is produced. The method of producing the cobalt oxide whisker crystal comprises the steps of: preparing a sodium-cobalt-potassium-oxide by calcining a raw material containing a sodium source, a cobalt source and a potassium source; and then firing the sodium-cobalt-potassium-oxide.;COPYRIGHT: (C)2004,JPO