Investigation of Sr, Mg codoped Na0.5Bi0.5TiO3 oxide ion conductor prepared by spark plasma sintering.

Authors :: Wang, W. G.
Li, M. Y.
Li, X. Y.
Hao, G. L.
Source :: Ionics; Sep2019, Vol. 25 Issue 9, p4265-4271, 7p
Publication Year :: 2019
Abstract: The spark plasma sintering and conventional sintering methods were used to prepare the Sr/Mg–codoped Na<subscript>0.5</subscript>Bi<subscript>0.48</subscript>Sr<subscript>0.02</subscript>Ti<subscript>0.96</subscript>Mg<subscript>0.04</subscript>O<subscript>2.95</subscript> (NBT-SM) compounds. By the AC impedance spectrum test, the grain and total conductivity of NBT-SM sample sintered by the spark plasma sintering method (NBT-SM-SPS) at 673 K can reach 1.23 mS/cm and 0.478 mS/cm, respectively. The grain conductivity of NBT-SM-SPS sample is around 4.2 times higher than that of NBT-SM sample prepared by the conventional sintering method (NBT-SM-CS). There is higher mobile oxygen vacancy concentration and vacancy mobility capability in the NBT-SM-SPS sample, which is the reason that there is higher oxygen ion conductivity in NBT-SM-SPS sample. The aging behavior investigation was carried out at 573 K. After 48 h aging, there is around 12.3% degradation of the grain conductivity in the NBT-SM-SPS sample. The conductivity degradation should result from the decrease of the oxygen vacancy mobility capability and mobile vacancy concentration. [ABSTRACT FROM AUTHOR]

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