F Giannici et al 2009 J. Phys.: Conf. Ser. 190 012077 doi:10.1088/1742-6596/190/1/012077
F Giannici1, D Messana1, A Longo2, L Sciortino and A Martorana1,2
Show affiliationsLanthanum barium gallate proton conductors are based on disconnected GaO4 groups. The insertion of hydroxyls in the LaBaGaO4 network proceeds through self-doping with Ba2+, consequent O2- vacancy formation to fulfill charge neutrality. With a structural investigation on self-doped LaBaGaO4 oxides using synchrotron XRD and EXAFS on the Ga K-edge, we find that: (a) the GaO4 tetrahedra retain their size throughout the whole series; (b) the GaO4 tetrahedra rotate as rigid bodies on hydration, leading to the formation of a network of shorter O-O configurations that are stabilized by hydrogen bonds; (c) contraction of the lattice occurs along the a unit cell axis, as a consequence of an overall structural rearrangement of the hydrated solid.
66.30.H- Self-diffusion and ionic conduction in nonmetals
61.72.J- Point defects and defect clusters
Condensed matter: electrical, magnetic and optical
Issue 1 (2009)
F Giannici et al 2009 J. Phys.: Conf. Ser. 190 012077
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