Year: 2002
Type: article
Abstract: Na x CoO 2-δ (0.5≤ x ≤1) crystals were grown by a flux method. The largest Na x CoO 2-δ crystal size was 10 × 10 × 0.5 mm 3 , and the crystal phase depended on the composition of the flux. Crystals grown from a flux of NaCl mixed with Na 2 CO 3 and B 2 O 3 and crystals grown from a flux of Na 2 CO 3 mixed with B 2 O 3 were identified as Na 0.6 CoO 2-δ (γ phase) and Na 0.9 CoO 2-δ (α phase), respectively. The structures and compositions of these crystal growths were determined with a powder X-ray diffraction device and an energy dispersive X-ray spectrometer, respectively. The in-plane thermoelectric power values of these two types of crystal increased with temperature and reached 96 µV/K and 87 µV/K at 450 K, respectively.
DOI: 10.1143/jjap.41.l777
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2045546205