Revealing the impact of acceptor dopant type on the electrical conductivity of sodium bismuth titanate

Influence of defect chemistry on the electromechanical strain properties of BNT–ST‐based ternary systems

“…Usually, the transition between high and low conductivity is nonlinear, which implies that NBT samples are either insulating or oxygen conductive (at high temperatures). In the case of aluminum doping, however, a similar mixed ionic–electronic conductivity could also be obtained 39 . 1BZ ceramics seem to reach a similar state.…”

Mixed ionic–electronic conduction and defect chemistry of (Na0.5Bi0.5TiO3)1−x(BiCoO3)x (0 ≤ x ≤ 0.06) solid solutions

“…9 Although such small d caused by "accidental" Bi-loss is difficult to control in a reproducible manner, statistics on s b of NB 0.50 T ceramics prepared by identical procedures show that s b values at 600 °C vary between ∼0.5 and 2 mS cm −1 . 7,9,58 Moreover, as pointed out by previous experimental studies and computational simulations, [15][16][17][18][19][20][21][22] acceptor-type dopants on the B-site of NBT have a strong tendency to trap oxygen vacancies to reduce the mobility of oxygen ions. The ionic radius for 6-fold Co 3+ is 0.61 Å (ref.…”

“…14. An alternative approach to manipulate the oxide-ion conductivity of NBT, other than varying the oxygen vacancy concentration, is utilizing the trapping effect between the positively charged oxygen vacancies ðV $$ O Þ and the negatively charged B-site acceptor-type dopants ðe:g: M 0 Ti or M 00 Ti Þ. As revealed by both rst-principles calculations and experimental studies, [15][16][17][18][19][20][21][22] formation of defect associates, for example…”

“…An alternative approach to manipulate the oxide-ion conductivity of NBT, other than varying the oxygen vacancy concentration, is utilizing the trapping effect between the positively charged oxygen vacancies and the negatively charged B-site acceptor-type dopants . As revealed by both first-principles calculations and experimental studies, 15–22 formation of defect associates, for example , or , limits the mobility of oxygen ions and therefore is detrimental to oxide-ion conduction. This has been confirmed by our previous studies on the electrical properties of NBT-BiAlO 3 (NBT-BA), NBT-BiGaO 3 (NBT-GB) and NBT-BiScO 3 (NBT-BS) solid solutions.…”

Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate‐based lead‐free piezoceramics

“…For instance, in sodium bismuth titanate (NBT) materials, acceptor doping (e.g., Fe 3+ , Mg 2+ , and Al 3+ ) leads to extraordinarily high oxygen ionic conductivity. 35,36 However, the formation of a solid solution with barium titanate leads to a decrease in sensitivity toward acceptor doping, at least concerning the impact on conductivity. 35 Concerning KNN, few successful studies are available.…”