INVESTIGADORES
CANEIRO Alberto
artículos
Título:
A high temperature study on the structural, linear expansion, thermodynamic stability and electrical properties of the BaCe0.8Pr0.2O3-d perovskite
Autor/es:
J.F. BASBUS; M. ARCE; F.D. PRADO; L. SUESCUN; A. CANEIRO; L.V. MOGNI
Revista:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Editorial:
ELECTROCHEMICAL SOC INC
Referencias:
Año: 2016 vol. 163 p. 516 - 522
ISSN:
0013-4651
Resumen:
Single phase BaCe0.8Pr0.2O3−δ perovkite was obtained by the modified Pechini method followed by self-combustion and sintering at 1350°C. Crystal structure, thermodynamic stability, linear expansion and electrical properties were characterized as a function of temperature, under oxidizing and reducing atmospheres. BaCe0.8Pr0.2O3−δ presents phase transitions under both atmospheres, which do not compromise the transport properties. The electrical conductivity showed a mixed character, dominated by electronic and oxygen vacancies transport in O2-containing atmosphere. Pr+4 reduction was observed above 400°C under H2-containing atmosphere. This reduction increases the oxygen non-stoichiometry and OH? charge carriers concentration, unit cell volume and thermal expansion coefficients (TECs). Pr+4 reduction suppresses the electronic conduction and hence the transport number for OH? would be dominant in wet reducing atmosphere.