The electrical transport properties of undoped and yttrium-doped strontium titanate (Sr(Ti1-xYx) O3-delta, x = 0, 0.02) under high pressure were investigated with in situ impedance spectroscopy measurements. A pressure-induced conductivity switching for undoped and 2 mole% Y-doped strontium titanate is observed at around similar to 10.0 and 7.0 GPa respectively, which are caused by a cubic to tetragonal I4/mcm phase transition. The decrease of the phase transition point of 2 mole% Y-doped strontium titanate can be attributed to larger Y3+ atoms occupying the B-site and the creation of more oxygen vacancies, which lead to octahedra tilting and symmetry breaking. The results of the voltage-bias dependence of grain-boundary impedance of undoped and 2 mole% Y-doped strontium titanate at different pressures revealed that Schottky-type potential barriers formed at grain boundaries are the key factor for the accumulation of oxygen vacancy at the interface under pressure.
HePing Li,KaiXiang Liu,YuKai Zhuang,et al. Evidence of the pressure-induced conductivity switching of yttrium-doped SrTiO3[J]. Journal of Physics: Condensed Matter,2016,28(47).
APA
HePing Li,KaiXiang Liu,YuKai Zhuang,HaiYing Hu,Lei Wu,&LiDong Dai.(2016).Evidence of the pressure-induced conductivity switching of yttrium-doped SrTiO3.Journal of Physics: Condensed Matter,28(47).
MLA
HePing Li,et al."Evidence of the pressure-induced conductivity switching of yttrium-doped SrTiO3".Journal of Physics: Condensed Matter 28.47(2016).
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