Multiferroicity in polar phase LiNbO3 at room temperature

Manikandan, M.; Kumar, Krishan; Aparnadevi, N.; Shanker, N. Praveen; Venkateswaran, C.

doi:10.1016/j.jmmm.2015.04.099

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…At lower frequencies, the relative permittivity was affected by the dipole, interfacial, electronic, and ionic characteristics of the material resulting in higher relative permittivity. However, permittivity starts to lag with the increase in the frequency of applied DC voltage 40 . This is due to the space charge effect between the gold electrode and the conductive substrate by which this dielectric trend slows down.…”

Section: Resultsmentioning

confidence: 99%

“…However, permittivity starts to lag with the increase in the frequency of applied DC voltage. 40 This is due to the space charge effect between the gold electrode and the conductive substrate by which this dielectric trend slows down. Furthermore, these space charge effects are overcome by the applied electric field of 2 V and the trend saturates above 100 kHz.…”

Section: Dielectric Properties and Energy Harvestingmentioning

confidence: 99%

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Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

et al. 2021

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Electromechanical energy demands homogenous thick films of piezoceramics with sufficiently large piezoelectric constant and reproducible performance. Single-phase LiTaO 3 films deposited by sol-gel processing have been fabricated as cantilevers to investigate the interdependence of dielectric and piezoelectric properties as a function of film thickness. Phase pure LiTaO 3 films with varying thickness in the range of 2.07-4.37 µm on stainless steel substrates were obtained after calcination of samples at Accepted Article This article is protected by copyright. All rights reserved 650 °C. The relative permittivity of optimized spin-coated films peaked at 479.73 (1 kHz), whereas the piezoelectric coefficient (d 33 mode) determined by piezo force microscopy was in the range of 21-24 pm/V. The effect of poling was studied through the butterfly and phase curves. A figure of merit up to 3.29 (10-18 m 2 /V 2) was determined for cantilever devices, which were able to generate a peak-to-peak voltage of 0.046-0.15 V using a 1 MΩ resistor as an impedance load at a fixed acceleration of 1.5 m/s 2. While the power density was in the range of ~ 4-20x10-9 W/m 3 , increased with the increasing film thickness. The leakage current density decreased in the range of 4x10-5-6x10-7 A/m 2 in the same direction. As both ferroelectric and piezoelectric properties of LiTaO 3 films are dependent on film thickness, an optimal energy conversion efficiency was obtained for a thickness of ~3 µm. Furthermore, these devices were tested up to a temperature of 150 °C for voltage generation. Given the need for lead-free piezoelectric materials for environmental applications, these LiTaO 3 cantilevers are very promising for vibrational energy harvester applications especially due to their cost effectiveness, small size, stability at higher temperatures, and repeatable properties which makes them suitable for MEMS devices for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Properties and Energy Harvestingmentioning

confidence: 99%

Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

et al. 2021

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“…For LiNbO 3 , various types of defects such as Li-vacancies, O-vacancies, Li-Nb antisite defects, etc are found in experiments [76][77][78][79]. In particular, oxygen-deficient LiNbO 3−δ in nanocrystallites and single crystals have been reported in several experiments [80][81][82][83], but high-pressure study has not been performed. We hope that our theoretical study may stimulate further experiments on oxygen-deficient LiNbO 3−δ under hydrostatic pressure.…”

Section: Pressure Effects On Oxygen-deficient Batio 3−δ and Linbo 3−δmentioning

confidence: 99%

Pressure-induced metal–insulator transition in oxygen-deficient LiNbO₃-type ferroelectrics

Xia¹,

Chen²,

Chen³

2021

J. Phys.: Condens. Matter

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Hydrostatic pressure and oxygen vacancies usually have deleterious effects on ferroelectric materials because both tend to reduce their polarization. In this work we use first-principles calculations to study an important class of ferroelectric materials—LiNbO3-type ferroelectrics (LiNbO3 as the prototype), and find that in oxygen-deficient LiNbO3−δ , hydrostatic pressure induces an unexpected metal–insulator transition between 8 and 9 GPa. Our calculations also find that strong polar displacements persist in both metallic and insulating oxygen-deficient LiNbO3−δ and the size of polar displacements is comparable to pristine LiNbO3 under the same pressure. These properties are distinct from widely used perovskite ferroelectric oxide BaTiO3, whose polarization is quickly suppressed by hydrostatic pressure and/or oxygen vacancies. The anomalous pressure-driven metal–insulator transition in oxygen-deficient LiNbO3−δ arises from the change of an oxygen vacancy defect state. Hydrostatic pressure increases the polar displacements of oxygen-deficient LiNbO3−δ , which reduces the band width of the defect state and eventually turns it into an in-gap state. In the insulating phase, the in-gap state is further pushed away from the conduction band edge under hydrostatic pressure, which increases the fundamental gap. Our work shows that for LiNbO3-type strong ferroelectrics, oxygen vacancies and hydrostatic pressure combined can lead to new phenomena and potential functions, in contrast to the harmful effects occurring to perovskite ferroelectric oxides such as BaTiO3.

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“…In particular, oxygen-deficient LiNbO 3−δ in nanocrystallites and single crystals have been reported in several experiments [80][81][82][83], but high-pressure study has not been performed.…”

Section: B Pressure Effects On Oxygen-deficient Batio 3−δ and Linbo 3−δmentioning

confidence: 99%

Pressure-induced metal-insulator transition in oxygen-deficient LiNbO$_3$-type ferroelectrics

Xia,

Chen,

Chen

2021

Preprint

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Hydrostatic pressure and oxygen vacancies usually have deleterious effects on ferroelectric materials because both tend to reduce their polarization. In this work we use first-principles calculations to study an important class of ferroelectric materials -LiNbO 3 -type ferroelectrics (LiNbO 3 as the prototype), and find that in oxygen-deficient LiNbO 3−δ , hydrostatic pressure induces an unexpected metal-insulator transition between 8 and 9 GPa. Our calculations also find that strong polar displacements persist in both metallic and insulating oxygen-deficient LiNbO 3−δ and the size of polar displacements is comparable to pristine LiNbO 3 under the same pressure. These properties are distinct from widely used perovskite ferroelectric oxide BaTiO 3 , whose polarization is quickly suppressed by hydrostatic pressure and/or oxygen vacancies. The anomalous pressuredriven metal-insulator transition in oxygen-deficient LiNbO 3−δ arises from the change of an oxygen vacancy defect state. Hydrostatic pressure increases the polar displacements of oxygen-deficient LiNbO 3−δ , which reduces the band width of the defect state and eventually turns it into an in-gap state. In the insulating phase, the in-gap state is further pushed away from the conduction band edge under hydrostatic pressure, which increases the fundamental gap. Our work shows that for LiNbO 3 -type strong ferroelectrics, oxygen vacancies and hydrostatic pressure combined can lead to new phenomena and potential functions, in contrast to the harmful effects occurring to perovskite ferroelectric oxides such as BaTiO 3 .

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Multiferroicity in polar phase LiNbO3 at room temperature

Cited by 14 publications

References 12 publications

Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

Pressure-induced metal–insulator transition in oxygen-deficient LiNbO₃-type ferroelectrics

Pressure-induced metal-insulator transition in oxygen-deficient LiNbO$_3$-type ferroelectrics

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Multiferroicity in polar phase LiNbO3 at room temperature

Cited by 14 publications

References 12 publications

Interdependence of piezoelectric coefficient and film thickness in LiTaO3 cantilevers

Interdependence of piezoelectric coefficient and film thickness in LiTaO3 cantilevers

Pressure-induced metal–insulator transition in oxygen-deficient LiNbO3-type ferroelectrics

Pressure-induced metal-insulator transition in oxygen-deficient LiNbO$_3$-type ferroelectrics

Contact Info

Product

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Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

Interdependence of piezoelectric coefficient and film thickness in LiTaO₃ cantilevers

Pressure-induced metal–insulator transition in oxygen-deficient LiNbO₃-type ferroelectrics