Heteronuclear complexes of the type Ln′Ln″1-x[Co(CN)6]·nH2O have been synthesized for potential applications in solid oxide fuel cells. SmxE1-xCo and SmxYb1-xCo complexes crystallize in the orthorhombic system, as do LaxSm1-xCo complexes for x = 0-0.6. A plot of the lattice parameters of the orthorhombic structures of the complexes as a function of reff [= xrLn′ + (1-x)rLn″] shows linear behaviour similar to that observed for the LnCo complexes. For the decomposed products, perovskite-type Ln′xLn″1-xCoO3 oxides are obtained. The crystal structure of Ln′xLn″.1-xCoO3 is orthorhombic for 0.1080<reff/nm<0.1199 and hexagonal for reff>0.1199 nm, while for reff<0.1080 nm no perovskite-type oxide was formed. We suggest that the orthorhombic distortion parameter is greater than ca. 0.267 for reff< 0.1080 nm and therefore no perovskite-type oxide is formed.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Materials Chemistry|
|State||Published - 1996|
ASJC Scopus subject areas
- Materials Chemistry