Effect of oxygen partial pressure on the bulk and grain-boundary components of conductivity in (Yb1 -x ax)2Ti2O7-δ (x = 0, 0.05, 0.1) solid solutions

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Effect of oxygen partial pressure on the bulk and grain-boundary components of conductivity in (Yb1 -x ax)2Ti2O7-δ (x = 0, 0.05, 0.1) solid solutions
Autor Petra Fedtke, A.V. Shlyakhtina, Andreas Busch, Torsten Barfels, Marion Wienecke, L.G. Shcherbakova
In: Materials Research Bulletin
Ausgabe 48
ISBN/ISSN:
Erscheinungsjahr 2013
Jahrgang
Seitenzahl 2707-2711
Hyperlink http://www.researchgate.net/publication/256808809_Effect_of_oxygen_partial_pressure_on_the_bulk_and_grain-boundary_components_of_conductivity_in_%28Yb1xCax%292Ti2O7_%28x__0_0.05_0.1%29_solid_solutions
Review anderes

The electrical conductivity of (Yb1−xCax)2Ti2O7−δ (x = 0, 0.05, 0.1) pyrochlore solid solutions in a flowing mixture of oxygen and nitrogen has been determined as a function of oxygen/nitrogen ratio using impedance spectroscopy. The materials are shown to be oxygen ion conductors. The 700 °C conductivity of undoped Yb2Ti2O7 is ~1 × 10−3 S/cm and that of (Yb0.95Ca0.05)2Ti2O7−δ and (Yb0.9Ca0.1)2Ti2O7−δ is ~7 × 10−3 S/cm. The increase in the bulk and grain boundary conductivity in the (Yb1−xCax)2Ti2O7−δ (x = 0, 0.05, 0.1) series is connected with a Ca doping effect, which ensures the high oxygen vacancy concentration in the grain interior and at grain boundaries.