Structural mechanism behind piezoelectric enhancement in off-stoichiometric Na0.5Bi0.5TiO3 based lead-free piezoceramics

Mishra, Anupam; Khatua, Dipak Kumar; De, Arnab; Majumdar, Bhaskar; Frömling, Till; Ranjan, Rajeev

doi:10.1016/j.actamat.2018.11.015

Cited by 43 publications

(24 citation statements)

References 45 publications

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“…Even for the higher doped materials this is actually achievable without a sign of significant loss. Compared to previous literature about non‐stoichiometric NBT compositions, these findings are rather surprising as a rather bulky and lossy loop would have been expected . Hence, the low temperature resistance is high enough to allow for ferroelectric polarization switching.…”

Section: Resultscontrasting

confidence: 62%

“…13 With respect to the ferroelectric properties it could be shown that high dielectric loss and leakage current result with high oxygen vacancy content already at room temperature. 18 Compositions for which polarization loops could be obtained did not show a hardening effect. The remanent polarization, however, could be indirectly modified by the influence of defects on grain size.…”

Section: Introductionmentioning

confidence: 94%

“…In case of NBT the conductivity changes from low intrinsic electronic conductivity to orders of magnitude higher ionically dominated conductivity with small acceptor content variations over a wide temperature range . With respect to the ferroelectric properties it could be shown that high dielectric loss and leakage current result with high oxygen vacancy content already at room temperature . Compositions for which polarization loops could be obtained did not show a hardening effect.…”

Section: Introductionmentioning

confidence: 97%

“…The remanent polarization, however, could be indirectly modified by the influence of defects on grain size. The size of the grains has a profound impact on the dominant relaxor phases …”

Section: Introductionmentioning

confidence: 99%

“…The size of the grains has a profound impact on the dominant relaxor phases. 18 For ferroelectric applications pure NBT is less relevant, the solid solution 0.94(Na 1/2 Bi 1/2 TiO 3 )-0.06 BaTiO 3 (NBT-6BT) is at the morphotropic phase boundary and thus exhibits superior ferroelectric properties. [19][20][21] The data on the impact of Bi-deficiency on NBT-BT is rather ambiguous.…”

Section: Introductionmentioning

confidence: 99%

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The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃

et al. 2019

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Na1/2Bi1/2TiO3 (NBT) based ceramics are amongst the most promising lead‐free ferroelectric materials. It was expected that the defect chemistry and the effect of doping of NBT would be similar to that observed for lead based materials, however, acceptor doping does not lead to ferroelectric hardening. Instead, high oxygen ionic conductivity is induced. Nevertheless, for solid solutions with BaTiO3 (BT), which are more relevant with respect to ferroelectric applications, such a drastic change of electrical properties has not been observed so far. To rationalize the difference in defect chemistry between NBT and its solid solution 94(Na1/2Bi1/2TiO3)–0.06 BaTiO3 (NBT–6BT) compositions with different concentrations of Fe‐dopant were investigated. The study illustrates that the materials exhibit very similar behavior to NBT, and extraordinarily high oxygen ionic conductivity could also be induced in NBT–6BT. The key difference between NBT–6BT and NBT is the range of the dependence of ionic conductivity with dopant concentration. Previous studies of NBT–6BT have not reached sufficiently high dopant concentrations to observe high conductivity. In consequence, the same defect chemical model can be applied to both NBT and its solid solutions. This will help to rationalize the effect of doping on ferroelectric properties of NBT‐ceramics and defect chemistry related degradation and fatigue.

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Section: Resultscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

“…The remanent polarization, however, could be indirectly modified by the influence of defects on grain size. The size of the grains has a profound impact on the dominant relaxor phases …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃

et al. 2019

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Understanding the Role of Oxygen Vacancy in Visible–Near‐Infrared‐Light‐Absorbing Ferroelectric Perovskite Oxides Created by Off‐Stoichiometry

Xiao

Wang

Jiao

et al. 2019

Adv Elect Materials

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Recently, the visible or even-to-near-infrared light absorbing perovskite ABO 3 solid state solutions, show promising application in solar cells and multienergy harvesters or sensors by simultaneously introducing transition metal and oxygen vacancies. However, the existence of oxygen vacancies fundamentally causes photoexcited carrier trapping and large leakage current. Therefore, it is still challenging to limit oxygen vacancies while maintaining low bandgap and high ferroelectricity. Here, an efficient charge compensation strategy by finely adjusting the ion ratio on the A-site to obtain an oxygen-vacancy-free relaxer ferroelectric is demonstrated in the system of Na x Bi y TiO 3 -BaTi 0.5 Ni 0.5 O 3 , where y > x. It is found that the oxygen-vacancyfree composition still yields strong visible-near-infrared-light-absorbing and enhanced photoresponse, in which the photocurrent density doubles from ≈0.16 to ≈0.32 μA cm −2 . A new bandgap tuning mechanism is proposed according to the local structural information of Ni ions obtained via extended X-ray absorption fine structure. Moreover, this work succeeds in establishing the relationship between the concentration of oxygen vacancies and ferroelectric/piezoelectric properties of Na x Bi y TiO 3 -BaTi 0.5 Ni 0.5 O 3 . This research points out a promising route to the material design of bandgap engineered ferroelectrics with controlled defects, which is expected to benefit a wide range of functional energy conversion devices.

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Influence of A-site non-stoichiometry on electromechanical properties of Sr(Hf0.5Zr0.5)O3-modified Bi0.5(Na0.8K0.2)0.5TiO3 piezoelectric ceramics

et al. 2020

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Structural mechanism behind piezoelectric enhancement in off-stoichiometric Na0.5Bi0.5TiO3 based lead-free piezoceramics

Cited by 43 publications

References 45 publications

The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃

The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃

Understanding the Role of Oxygen Vacancy in Visible–Near‐Infrared‐Light‐Absorbing Ferroelectric Perovskite Oxides Created by Off‐Stoichiometry

Influence of A-site non-stoichiometry on electromechanical properties of Sr(Hf0.5Zr0.5)O3-modified Bi0.5(Na0.8K0.2)0.5TiO3 piezoelectric ceramics

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Structural mechanism behind piezoelectric enhancement in off-stoichiometric Na0.5Bi0.5TiO3 based lead-free piezoceramics

Cited by 43 publications

References 45 publications

The effect of Fe‐acceptor doping on the electrical properties of Na1/2Bi1/2TiO3 and 0.94 (Na1/2Bi1/2)TiO3–0.06 BaTiO3

The effect of Fe‐acceptor doping on the electrical properties of Na1/2Bi1/2TiO3 and 0.94 (Na1/2Bi1/2)TiO3–0.06 BaTiO3

Understanding the Role of Oxygen Vacancy in Visible–Near‐Infrared‐Light‐Absorbing Ferroelectric Perovskite Oxides Created by Off‐Stoichiometry

Influence of A-site non-stoichiometry on electromechanical properties of Sr(Hf0.5Zr0.5)O3-modified Bi0.5(Na0.8K0.2)0.5TiO3 piezoelectric ceramics

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The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃

The effect of Fe‐acceptor doping on the electrical properties of Na_1/2Bi_1/2TiO₃ and 0.94 (Na_1/2Bi_1/2)TiO₃–0.06 BaTiO₃