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 analy...

Full description

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
Description
Summary: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.