High-temperature electrical properties of lanthanum beta-alumina solid electrolytes

Autor(es)

Costa, G. C. C. ^[1] ; Muccillo, R. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Ctr Sci & Technol Mat, BR-05422970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 35, n. 1, p. 467-470, JAN 2009.
• Citações Web of Science: 0

Resumo

Impedance spectroscopy measurements were carried out in the 10 Hz to 10 MRz frequency range from 500 to 1200 degrees C in LaAl(11)O(18) pellets sintered at 1600 degrees C. The powders were obtained by the polymeric precursor technique. The sintered pellets were nearly single phase LaAl(11)O(18). The bulk electrical resistivity was evaluated from the {[}-Z `'(omega) x Z'(omega)] impedance diagrams. The value of the activation energy for the ionic conduction, 0.89 eV, was determined from the Arrhenius plot of the bulk conductivity. An yttria-stabilized zirconia (YSZ) oxygen pump and an YSZ oxygen sensor were used for providing 10-1500 ppm of partial pressure of oxygen (pO(2)) at 1000 degrees C for determining the electromotive force (emf) in a Pt/LaAl(11)O(18)/Cr(2)O(3) + Cr electrochemical cell. The results follow the Nernst law. The high signal-to-noise ratio of the emf at low pO(2) values shows that the LaAl(11)O(18) specimens may be used in sensors for detection of oxygen at high temperatures. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
• Beneficiário: Reginaldo Muccillo
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 98/14324-0 - Multidisciplinary Center for Development of Ceramic Materials
• Beneficiário: Elson Longo da Silva
• Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs