Repositorio Institucional
Repositorio Institucional
CONICET Digital
  • Inicio
  • EXPLORAR
    • AUTORES
    • DISCIPLINAS
    • COMUNIDADES
  • Estadísticas
  • Novedades
    • Noticias
    • Boletines
  • Ayuda
    • General
    • Datos de investigación
  • Acerca de
    • CONICET Digital
    • Equipo
    • Red Federal
  • Contacto
JavaScript is disabled for your browser. Some features of this site may not work without it.
  • INFORMACIÓN GENERAL
  • RESUMEN
  • ESTADISTICAS
 
Artículo

Effect of cationic order-disorder on the transport properties of LaBaCo2O6-d and La0.5Ba0.5CoO3-d perovskites

Garcés, Diana Andrea; Setevich Martinez, Cristian F.; Caneiro, AlbertoIcon ; Cuello, Gabriel JulioIcon ; Mogni, Liliana VerónicaIcon
Fecha de publicación: 01/2014
Editorial: Wiley Blackwell Publishing, Inc
Revista: Journal Of Applied Crystallography
ISSN: 0021-8898
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

A-site cationic ordered LaBaCo2O6-d and disordered La0.5Ba0.5CoO3-d, perovskite phases were obtained by Solid State Reaction. Their structural properties were studied at room temperature and 400 °C combining powder diffraction techniques, XRD and NPD with an independent determination of the oxygen content of the samples by thermogravimetry. La0.5Ba0.5CoO3-d exhibits cubic symmetry with cations randomly distributed, whereas the LaBaCo2O6-d shows tetragonal symmetry with the La+3 and Ba+2 ions distributed in alternating layers. The diffraction data were analyzed using the Rietveld method and testing different structural and microstructural models. Bond Valence and Fourier methods were used to determine bond distances and neutron/electron density maps. The LaBaCo2O6-d presents higher concentration of oxygen vacancies than La0.5Ba0.5CoO3-d, because the O is weakly bonded to LaO layers. The anisotropic atomic displacement and the neutron density distribution suggest a two-dimensional O-migration path for LaBaCo2O6-d and a three-dimensional for La0.5Ba0.5CoO3-d.The mechanism of electrical conductivity is by electron-hole with high mobilities (La0.5Ba0.5CoO3−d= 2.49 cm2V−1s−1and LaBaCo2O6−δ= 1.48 cm2V−1s−1 at room temperature) and low activation energy (26−=0.019 and 0.50.53−=0.030 ). It has been also found that the higher electronic and ionic conductivities in La0.5Ba0.5CoO3-d compared to those in LaBaCo2O6-d, is due to the higher dimensionality of transport and to higher overlapping between Co-3d and O-2p orbital.
Palabras clave: Perovskites , Neutron Diffraction , Electrical Conductivity , Disorder
Ver el registro completo
 
Archivos asociados
Thumbnail
 
Tamaño: 724.1Kb
Formato: PDF
.
Descargar
Licencia
info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/27739
DOI: http://dx.doi.org/10.1107/S1600576713031233
URL: http://scripts.iucr.org/cgi-bin/paper?S1600576713031233
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IFISUR)
Articulos de INSTITUTO DE FISICA DEL SUR
Citación
Garcés, Diana Andrea; Setevich Martinez, Cristian F.; Caneiro, Alberto; Cuello, Gabriel Julio; Mogni, Liliana Verónica; Effect of cationic order-disorder on the transport properties of LaBaCo2O6-d and La0.5Ba0.5CoO3-d perovskites; Wiley Blackwell Publishing, Inc; Journal Of Applied Crystallography; 47; 2014; 1-2014; 325-334
Compartir
Altmétricas
 

Enviar por e-mail
Separar cada destinatario (hasta 5) con punto y coma.
  • Facebook
  • X Conicet Digital
  • Instagram
  • YouTube
  • Sound Cloud
  • LinkedIn

Los contenidos del CONICET están licenciados bajo Creative Commons Reconocimiento 2.5 Argentina License

https://www.conicet.gov.ar/ - CONICET

Inicio

Explorar

  • Autores
  • Disciplinas
  • Comunidades

Estadísticas

Novedades

  • Noticias
  • Boletines

Ayuda

Acerca de

  • CONICET Digital
  • Equipo
  • Red Federal

Contacto

Godoy Cruz 2290 (C1425FQB) CABA – República Argentina – Tel: +5411 4899-5400 repositorio@conicet.gov.ar
TÉRMINOS Y CONDICIONES