Effect of oxygen partial pressure on the bulk and grain-boundary components of conductivity in (Yb1−xCax)2Ti2O7−δ (x = 0, 0.05, 0.1) solid solutions
Effect of oxygen partial pressure on the bulk and grain-boundary components of conductivity in (Yb1−xCax)2Ti2O7−δ (x = 0, 0.05, 0.1) solid solutions
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氧分压对 (Yb1âxCax)2Ti2O7âδ (x = 0, 0 05, 0 1) 固溶体中电导率的体相和晶界成分的影响
DOI:
10.1016/j.materresbull.2013.03.032
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发表时间:
2013
影响因子:
5.4
通讯作者:
L.G. Shcherbakova
中科院分区:
文献类型:
--
作者:
Petra Fedtke;A.V. Shlyakhtina;Andreas Busch;Torsten Barfelsa;Marion Wienecke;L.G. Shcherbakova
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 Yb2Ti2O7is ~1×10−3S/cm and that of (Yb0.95Ca0.05)2Ti2O7−δand (Yb0.9Ca0.1)2Ti2O7−δis ~7×10−3S/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.
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