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Schmidt, Harald
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Publications (12/12 displayed)
- 2024Acoustic Loss in LiNb1−xTaxO3 at Temperatures up to 900 °C
- 2024Acoustic loss in LiNb1-xTaxO3 at temperatures up to 900 °C
- 2023Increase of electrode life in resistance spot welding of aluminum alloys by the combination of surface patterning and thin-film diffusion barrierscitations
- 2023In-situ Neutron Reflectometry to Determine Ge Self-Diffusivities and Activation Energy of Diffusion in Amorphous Ge0.8Si0.2citations
- 2023Lithium Niobate for Fast Cycling in Li-ion Batteries: Review and New Experimental Resultscitations
- 2023Lithium-ion diffusion in near-stoichiometric polycrystalline and monocrystalline LiCoO2citations
- 2022Activation energy of diffusion determined from a single in-situ neutron reflectometry experimentcitations
- 2022The lithiation onset of amorphous silicon thin-film electrodescitations
- 2021Proton exchange at LiNbO3 surfaces - diffusion investigations
- 2014Microstructural Evolution of (Ti,W,Cr)B2 Coatings Deposited on Steel Substrates during Annealing
- 2012Self-diffusion of lithium in amorphous lithium niobate layers
- 2010Crystallization Kinetics of Amorphous Si-C-N Ceramics: Dependence on Nitrogen Partial Pressure
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article
Acoustic Loss in LiNb1−xTaxO3 at Temperatures up to 900 °C
Abstract
<jats:p>Lithium niobate‐lithium tantalate solid solutions are new piezoelectric crystals that enable to combine the advantages of their edge compounds with respect to the high thermal stability of lithium tantalate and the high Curie temperature of lithium niobate. This study aims to determine of the acoustic losses of bulk resonators with varying Nb/Ta ratios and their correlation with charge transport at temperatures up to 900 °C and at reduced oxygen partial pressures. Techniques such as resonant piezoelectric spectroscopy and contactless resonant ringdown spectroscopy are used to determine the acoustic losses. Further, the electrical conductivity is determined by impedance spectroscopy. A one‐dimensional physical model for vibrating plates is fitted to the data to extract key parameters such as piezoelectric coefficients and elastic modulus as a function of temperature. Noncontacting determination of loss excludes the impact of metal electrodes and reveals up to 300 °C values in the order of Akhiezer‐type losses. Resonators operated at 2 MHz show a rapid loss increase above about 450 °C, which is attributed to the piezoelectric/carrier relaxation. The latter follows from atomistic models using the key parameters mentioned and the electrical conductivity. The modeling includes variation of the resonance frequency and suggests higher resonance frequencies to lower the acoustic loss.</jats:p>