Electromechanical properties of langasite resonators at elevated temperatures

Schulz, Michał; Fritze, Holger

doi:10.1016/j.renene.2007.05.016

Cited by 30 publications

(21 citation statements)

References 11 publications

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“…The remaining four components of the elastic compliance tensor may be determined using differently oriented rods excited in length-extensional (LE) mode of vibration. Here, the effective compliance s eff is a superposition of several components as function of the angle ϕ between the rod and the Y axis (Ikeda, 1990;Schulz and Fritze, 2008): …”

Section: Piezoelectric Equationsmentioning

confidence: 99%

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Correlation of BAW and SAW properties of langasite at elevated temperatures

Schulz¹,

Mayer²,

Shrena³

et al. 2015

J. Sens. Sens. Syst.

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Abstract. The full set of electromechanical data of langasite (La 3 Ga 5 SiO 14 ) is determined in the temperature range from 20 to 900 • C using differently oriented bulk acoustic wave resonators. For data evaluation a physical model of vibration is developed and applied. Thereby, special emphasis is taken on mechanical and electrical losses at high temperatures. The resulting data set is used to calculate the properties of surface acoustic waves. Direct comparison with experimental data such as velocity, coupling coefficients and propagation loss measured using surface acoustic wave devices with two different crystal orientations shows good agreement.

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Section: Piezoelectric Equationsmentioning

confidence: 99%

“…(14) and under the assumption of harmonic time dependence e j ωt of the electric field E 1 , the electric impedance of the resonator is calculated (Schulz and Fritze, 2008)…”

Section: Models For Different Crystal Orientations 231 Length-extenmentioning

confidence: 99%

Correlation of BAW and SAW properties of langasite at elevated temperatures

Schulz¹,

Mayer²,

Shrena³

et al. 2015

J. Sens. Sens. Syst.

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“…Especially, the transport of protons along the Z-axis of the crystals should be much faster than any other type of diffusion. The proton-related conductivity has been described in detail by Schulz et al [15,16]. It should be noted, that this transport phenomenon is anisotropic.…”

Section: Operation In Water Containing Atmospheresmentioning

confidence: 99%

Electromechanical properties and defect chemistry of high-temperature piezoelectric materials

Schulz

Sauerwald

Richter

et al. 2008

Ionics

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Langasite and gallium phosphate are shown to exhibit piezoelectrically stimulated bulk acoustic waves up to at least 1,400 and 900°C, respectively. Most critical issues are stoichiometry changes due to, e.g. low oxygen partial pressures, and high losses. Therefore, the paper discusses the atomistic transport and defect chemistry of those crystals and correlates them with the electromechanical properties. First, the defect chemistry of langasite is investigated. As long as the atmosphere is nearly hydrogen-free, the transport of charge carriers is governed by oxygen movement. A dominant role of hydrogen is observed in hydrogenous atmospheres. Based on the developed defect model, donors are expected to suppress the oxygen vacancy concentration and, thereby, the loss in langasite. The prediction is proven by niobium doping and found to be valid. A one-dimensional physical model of thickness shear mode resonators is summarized. The analysis of the resonance spectra showed that the loss of the resonators can be described satisfactorily by mechanical and electrical contributions expressed as effective viscosity and bulk conductivity, respectively. The mechanical loss in langasite is significantly impacted by the electrical conductivity due to the piezoelectric coupling. The effect of the piezoelectric coupling on the loss is negligible for gallium phosphate since it shows an extremely low electrical conductivity.

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“…These constants are determined by the resonant method according to [16,17] and by the pulse echo method in a temperature range from room temperature to 900 • C and to 800 • C, respectively. Additionally, the piezoelectric constant d 11 is measured from room temperature to 900 • C by the LDV method.…”

Section: Methodsmentioning

confidence: 99%

“…This work focuses on the determination of piezoelectric constants of CTGS from ambient temperature to 900 • C, using the resonant method according to [16,17] and the ultrasonic pulse-echo method. Additionally, the piezoelectric constant d 11 is determined by the laser Doppler vibrometry (LDV) technique.…”

Section: Introductionmentioning

confidence: 99%

Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures

et al. 2018

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The electrical conductivity, resonance frequency and piezoelectric strain constants are determined for ordered piezoelectric Ca3TaGa3Si2O14 (CTGS) single crystals from room temperature to 900 • C. The latter result from three independent methods, namely resonant, ultrasonic pulse-echo, and laser Doppler vibrometry techniques, which allows validating the results. Further, the long-term behaviour of fundamental materials properties including electrical conductivity and resonance frequency are examined at 1000 • C for CTGS crystals, grown by di erent manufacturers. After an initial period of about 500 h, the conductivity is found to remain nearly constant for at least 1500 h. In a period of 2000 5000 h a decrease of conductivity by only 20% is observed. The resonance frequency is found to decrease almost linearly in a period of 500 5000 h for all investigated samples.

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Electromechanical properties of langasite resonators at elevated temperatures

Cited by 30 publications

References 11 publications

Correlation of BAW and SAW properties of langasite at elevated temperatures

Correlation of BAW and SAW properties of langasite at elevated temperatures

Electromechanical properties and defect chemistry of high-temperature piezoelectric materials

Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures

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Electromechanical properties of langasite resonators at elevated temperatures

Cited by 30 publications

References 11 publications

Correlation of BAW and SAW properties of langasite at elevated temperatures

Correlation of BAW and SAW properties of langasite at elevated temperatures

Electromechanical properties and defect chemistry of high-temperature piezoelectric materials

Electrical, Electromechanical and Piezoelectric Properties of Ca3TaGa3Si2O14 Resonators at Elevated Temperatures

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Product

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Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures