Conditions of application of LiNbO3 based piezoelectric resonators at high temperatures

Палатников, М. Н.; Sandler, V. A.; Сидоров, Н. В.; Макарова, О. В.; Manukovskaya, D. V.

doi:10.1016/j.physleta.2020.126289

Cited by 12 publications

(11 citation statements)

References 10 publications

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“…Beyond these publications, to the best of our knowledge, no systematic studies on LNT were published. The piezoelectric properties of LN resonators were studied up to 500 • C in [40] and up to 900 • C in [16,41]. Finally, the temperature stability of LN-based piezoelectric transducers was examined in [42,43].…”

Section: Introductionmentioning

confidence: 99%

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

et al. 2021

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Electrical conductivity and acoustic loss Q−1 of single crystalline Li(Nb,Ta)O3 solid solutions (LNT) are studied as a function of temperature by means of impedance spectroscopy and resonant piezoelectric spectroscopy, respectively. For this purpose, bulk acoustic wave resonators with two different Nb/Ta ratios are investigated. The obtained results are compared to those previously reported for congruent LiNbO3. The temperature dependent electrical conductivity of LNT and LiNbO3 show similar behavior in air at high temperatures from 400 to 700 °C. Therefore, it is concluded that the dominant transport mechanism in LNT is the same as in LN, which is the Li transport via Li vacancies. Further, it is shown that losses in LNT strongly increase above about 500 °C, which is interpreted to originate from conductivity-related relaxation mechanism. Finally, it is shown that LNT bulk acoustic resonators exhibit significantly lower loss, comparing to that of LiNbO3.

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Section: Introductionmentioning

confidence: 99%

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

et al. 2021

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“…Charge transfer in lithium niobate single crystals is commonly described by two electrical conductivity models [7]. At high temperatures (above 450 °С) the electrical conductivity is brought about by intrinsic carriers [8]. At low temperatures the main contribution to lithium niobate conductivity is believed to be from defects and the related conductivity mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…Part of the diffusion-generated lithium vacancies are filled by niobium atoms causing the formation of antisite defects which may form small-radius polarons when exposed to an electron field. It is believed that these carriers deliver the main contribution to the low-temperature conductivity of lithium niobate crystals (below ~400 °С [8]) after annealing in an oxygen-free atmosphere [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of contact phenomena on the electrical conductivity of reduced lithium niobate

Shportenko¹,

Kislyuk²,

Turutin³

et al. 2021

MoEM

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Lithium niobate is a ferroelectric material finding a wide range of applications in optical and acoustic engineering. Annealing of lithium niobate crystals in an oxygen-free environment leads to appearance of black coloration and concomitant increasing electrical conductivity due to chemical reduction. There are plenty of literary data on the electrophysical properties of reduced lithium niobate crystals though contact phenomena occurring during electrical conductivity measurement as well as issues of interaction between the electrode material and the test specimens are almost disregarded. The effect of chromium and indium tin oxide electrodes on the results of measurements of electrophysical parameters at room temperature for lithium niobate specimens reduced at 1100 °C has been investigated. It was found that significant nonlinearities in the VACs of the specimens at below 5 V distort the specific resistivity readings for lithium niobate. This requires measurements at higher voltages. Impedance spectroscopy studies have shown that the measurement results are largely affected by capacities including those probably induced near the contacts. It has been shown that the experimental results are described adequately well by a model implying the presence of near-contact capacities that are parallel to the specimen’s own capacity. Possible mechanism of the induction of these capacities has been described and a hypothesis has been proposed of the high density of electron states at the electrode/specimen interface that can trap carriers, the concentration of trapped carriers growing with an increase in annealing duration.

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“…Ferroelectric lithium niobate crystals possess high thermal stability of material properties (piezoelectric, elastic, electromechanical etc.) for different cuts [ 44 ], especially in transducers operating in the resonant regime [ 45 ]. Furthermore, the lead-free nature of LN meets the demands of the RoHS directive which assumes the restriction of use of certain hazardous substances in electrical and electronic equipment.…”

Section: Introductionmentioning

confidence: 99%

Self-Biased Bidomain LiNbO3/Ni/Metglas Magnetoelectric Current Sensor

Бичурин

Петров

Leontiev

et al. 2020

Sensors

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The article is devoted to the theoretical and experimental study of a magnetoelectric (ME) current sensor based on a gradient structure. It is known that the use of gradient structures in magnetostrictive-piezoelectric composites makes it possible to create a self-biased structure by replacing an external magnetic field with an internal one, which significantly reduces the weight, power consumption and dimensions of the device. Current sensors based on a gradient bidomain structure LiNbO3 (LN)/Ni/Metglas with the following layer thicknesses: lithium niobate—500 μm, nickel—10 μm, Metglas—29 μm, operate on a linear section of the working characteristic and do not require the bias magnetic field. The main characteristics of a contactless ME current sensor: its current range measures up to 10 A, it has a sensitivity of 0.9 V/A, its current consumption is not more than 2.5 mA, and its linearity is maintained to an accuracy of 99.8%. Some additional advantages of a bidomain lithium niobate-based current sensor are the increased sensitivity of the device due to the use of the bending mode in the electromechanical resonance region and the absence of a lead component in the device.

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Conditions of application of LiNbO3 based piezoelectric resonators at high temperatures

Cited by 12 publications

References 10 publications

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

Effect of contact phenomena on the electrical conductivity of reduced lithium niobate

Self-Biased Bidomain LiNbO3/Ni/Metglas Magnetoelectric Current Sensor

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Conditions of application of LiNbO3 based piezoelectric resonators at high temperatures

Cited by 12 publications

References 10 publications

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

﻿Effect of contact phenomena on the electrical conductivity of reduced lithium niobate

Self-Biased Bidomain LiNbO3/Ni/Metglas Magnetoelectric Current Sensor

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Effect of contact phenomena on the electrical conductivity of reduced lithium niobate