Influence of A-site off-stoichiomety on grain conductivity and oxygen relaxation behavior of Na0.5Bi0.5TiO3 ceramics

Wang, W.G.; Li, X.Y.; Liu, T.; Hao, Gang

doi:10.1016/j.ssi.2018.10.024

Cited by 7 publications

(1 citation statement)

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“…The tolerance factor for the Na0.52Bi0.47Ti1-xGaxO3-δ (x=0, 0.01, 0.015, 0.02) samples was virtually unchanged, which indicates that Ga 3+ doping has very little effects on the lattice distortion. [18]. An equivalent circuit formed by three R//CPE elements in series is used to fit the impedance spectrum [16,19].…”

Section: Phase Structurementioning

confidence: 99%

Investigation of Ga doping for non-stoichiometric sodium bismuth titanate ceramics

wang

et al. 2021

J Mater Sci: Mater Electron

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The electrical performance of Ga 3+ doping Na0.5Bi0.5TiO3-based oxygen ion conductor was studied. The Na0.52Bi0.47Ti1-xGaxO3-δ (x=0, 0.01, 0.015, 0.02) samples were fabricated by the means of traditional solid-state reaction. The results of AC impedance measurement show that the bulk conductivity of Na0.52Bi0.47Ti1-xGaxO3-δ samples decrease monotonously with the increase of Ga 3+ doping. At 673 K, the bulk conductivity of the Na0.52Bi0.47Ti0.98Ga0.02O3-δ sample is 7.19×10 -4 S/cm, which is lower than that of Na0.52Bi0.47TiO3-δ sample under the identical test temperature. The highest total conductivity emerges in the Na0.52Bi0.47Ti0.99Ga0.01O3-δ sample with 1.387×10 -4 S/cm at 623 K for the Ga 3+ doping content of 1 mol%, which demonstrate that a slight of Ga 3+ doping supports the enhancement of the total conductivity. A relaxation peak was observed in the Na0.52Bi0.47Ti1-xGaxO3-δ compounds. As the Ga 3+ ions were introduced into the Na0.52Bi0.47TiO3-δ compound, there is an increasing trend of the relaxation activation energy educed by the internal friction test. In addition, the oxygen relaxtion height of Na0.52Bi0.47Ti1-xGaxO3-δ samples decreases along with the introduction of the Ga 3+ doping, suggesting that the introduction of the Ga 3+ leads to the decrease of mobile oxygen vacancy .

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Section: Phase Structurementioning

confidence: 99%