Electrical and structural properties of camno-y ceramic compounds

By using the solid-state reaction method samples of Ca1-xYxMnO3 (CaMnO-Y) were prepared. Transport properties of the samples were studied from electrical resistivity ρ(T) and Seebeck coefficient S(T) measurements. The structural and morphological properties were researched by X-ray diffraction analysis and scanning electron microscopy (SEM), respectively. The Seebeck coefficient is negative throughout the studied temperature range indicating a conduction given by negative charge carriers. The magnitude of S(T) decreases with the yttrium level, which suggest an increase in the charge carrier density. The temperature behavior of electrical resistivity exhibit a semiconducting character; the magnitude of ρ(T) decreases with yttrium level reaching minimum values close to 0.5 Ω·cm. From the electrical resistivity and Seebeck coefficient experimental data it was possible to calculate the thermoelectric power factor, which shows maximum values around 0.12μW/K2cm.

• Autores: Páez, John J.; Rodríguez, Julio E.
• Tipo de recurso: Article of journal
• Fecha de publicación: 2012
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/72671
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/72671; http://bdigital.unal.edu.co/37145/
• Palabra clave: Óxidos cerámicos; Materiales termoeléctricos; Figura de mérito; Propiedades de transporte; Oxide ceramics; Thermoelectric materials; Figure of merit; Transport properties.
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional