• Paengson, Supasit
• Thanachayanont, Chanchana
• Muthitamongkol, Pennapa
• Seetawan, Tosawat

Abstract

<jats:p>We present characterization and thermoelectric properties of oxide thermoelectric materials of P-Ca<jats:sub>3</jats:sub>Co<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub> and N-CaMnO<jats:sub>3</jats:sub> synthesized by solid state reaction method and sintering in air. The crystalline structure was measured by x-ray diffraction (XRD) and confirmed by transmission electron microscope (TEM). The powder size and gran size of P-Ca<jats:sub>3</jats:sub>Co<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub> and N-CaMnO<jats:sub>3</jats:sub> were observed by scanning electron microscope (SEM). The electrical resistivity and Seebeck coefficient are measured. It was found that, the P-Ca<jats:sub>3</jats:sub>Co<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub>shows the point symmetry groups in three dimensions require of monoclinic system and N-CaMnO<jats:sub>3</jats:sub> shows cubic system corresponding with TEM results. The powder size and grain size were obtained mean values of 1-3 µm. The electrical resistivity and Seebeck coefficient were obtained for P-Ca<jats:sub>3</jats:sub>Co<jats:sub>4</jats:sub>O<jats:sub>9</jats:sub>and for N-CaMnO<jats:sub>3</jats:sub> at 360 K.</jats:p>

Topics

• grain
• resistivity
• grain size
• scanning electron microscopy
• x-ray diffraction
• transmission electron microscopy
• sintering