Electrical properties and temperature stability of Li-deficient and near stoichiometric Li(Nb,Ta)O3 solid solutions up to 900 °C

Hurskyy, Stepan; Yakhnevych, U.; Kofahl, Claudia; Tichy-Rács, Éva; Schmidt, Harald; Ganschow, Steffen; Fritze, Holger; Suhak, Yuriy

doi:10.1016/j.ssi.2023.116285

Cited by 9 publications

(2 citation statements)

References 58 publications

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“…Recently, there has been growing interest in lithium niobate-tantalate solid solutions (LiNb 1– x Ta x O 3 ), − which are stable without the formation of a miscibility gap. This system can be used to combine and tailor advantageous physical properties of the two boundary materials (Curie temperature, temperature stability, and piezoelectric coefficients).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Kofahl,

Dörrer,

Wulfmeier

et al. 2024

Chem. Mater.

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Hydrogen is an impurity that is incorporated into LiNb 1−x Ta x O 3 crystals during crystal growth or during thermal treatment in a humid atmosphere and may influence the physical properties in different ways. In this context, diffusion of hydrogen is an important process because it may enhance the ion conductivity of the material. We investigated the diffusion of hydrogen in LiNbO 3 , LiTaO 3 , and LiNb 0.15 Ta 0.85 O 3 single crystals in the temperature range between 311 and 606 °C using deuterium from a gaseous D 2 O source as a tracer. Diffusivities were determined by analyzing the relative deuterium fraction in the crystal with infrared spectroscopy or secondary ion mass spectrometry. The results are in good agreement with each other. The diffusivities in LiNbO 3 can be described by the Arrhenius law with an activation energy of 0.98 eV. The diffusivities in LiTaO 3 and LiNb 0.15 Ta 0.85 O 3 are nearly identical to those in LiNbO 3 within a maximum factor of 2. A direct interstitial diffusion mechanism is suggested where hydrogen migrates in the energy landscape of the crystal. From a comparison of the partial H and Li ion conductivities calculated from diffusivities to electrical conductivities measured by impedance spectroscopy, we conclude that hydrogen may contribute to the overall conductivity below 400 °C.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Kofahl,

Dörrer,

Wulfmeier

et al. 2024

Chem. Mater.

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“…The first successful result on growing LiNb (1-x) Ta x O 3 crystals was demonstrated in [3]. Subsequently, studies on the structural and physical properties of the crystals were carried out [4][5]. Crystals of LiNb (1-x) Ta x O 3 complex solutions will eventually find application in high-temperature sensor devices and actuators.…”

Section: Introductionmentioning

confidence: 99%

Advanced Piezoelectric Crystals for Acoustoelectronics

Roshchupkin

2023

J. Phys.: Conf. Ser.

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Ferroelectric crystals of LiNb(1-x)TaxO3 solid solutions and piezoelectric crystals Ca3TaGa3Si2O14 were grown by the Czochralski method. The composition of LiNb(1-x)TaxO3 crystals was studied by mass spectrometry with inductively coupled plasma. The piezoelectric properties of crystals were studied and the independent piezoelectric moduli dij were measured. Piezoelectric and acoustic properties of the crystals were studied by the method of high resolution X-ray diffraction and scanning electron microscopy. The temperature dependences of acoustic properties of crystals were investigated.

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Oxygen Diffusion in Li(Nb,Ta)O₃ Single Crystals

Kofahl,

Uhlendorf,

Muscutt

et al. 2024

Physica Status Solidi (a)

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Oxygen tracer self‐diffusion in LiNbO3, LiTaO3, and LiNb0.15Ta0.85O3 single crystals between 880 and 1050 °C is investigated. 18O2 isotope‐exchanged samples are analyzed by secondary ion mass spectrometry. The diffusivities of each of the three different materials can be described by the Arrhenius law with an activation enthalpy of diffusion of about 3.2–3.5 eV. The diffusivities are highest for LiNbO3 and are lower by about one order of magnitude for LiNb0.15Ta0.85O3 and LiTaO3. The change of the pre‐exponential factor is identified as the reason for the difference in diffusivities. The experimental results are compared to defect formation energy calculations as given in literature and to energy barrier calculations for the diffusion of a single O vacancy as determined by nudged elastic band calculations based on density‐functional theory. An oxygen vacancy mechanism is suggested to govern diffusion. The difference in diffusivities is tentatively attributed to a different number of freely migrating vacancies, probably due to defect complex formation.

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Electrical properties and temperature stability of Li-deficient and near stoichiometric Li(Nb,Ta)O3 solid solutions up to 900 °C

Cited by 9 publications

References 58 publications

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Advanced Piezoelectric Crystals for Acoustoelectronics

Oxygen Diffusion in Li(Nb,Ta)O₃ Single Crystals

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Electrical properties and temperature stability of Li-deficient and near stoichiometric Li(Nb,Ta)O3 solid solutions up to 900 °C

Cited by 9 publications

References 58 publications

Hydrogen Diffusion in Li(Nb,Ta)O3 Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Hydrogen Diffusion in Li(Nb,Ta)O3 Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Advanced Piezoelectric Crystals for Acoustoelectronics

Oxygen Diffusion in Li(Nb,Ta)O3 Single Crystals

Contact Info

Product

Resources

About

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Hydrogen Diffusion in Li(Nb,Ta)O₃ Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry

Oxygen Diffusion in Li(Nb,Ta)O₃ Single Crystals