1. Stoichiometric Lithium Niobate Crystals: Towards Identifiable Wireless Surface Acoustic Wave Sensors Operable up to 600$^\circ$C
- Author
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Streque, Jérémy, Aubert, Thierry, Kokanyan, Ninel, Bartoli, Florian, Taguett, Amine, Polewczyk, Vincent, Kokanyan, Edvard, Hage-Ali, Sami, Boulet, Pascal, and Elmazria, Omar
- Subjects
Physics - Applied Physics ,Condensed Matter - Materials Science ,Physics - Classical Physics - Abstract
Wireless surface acoustic wave (SAW) sensors constitute a promising solution to some unsolved industrial sensing issues taking place at high temperatures. Currently, this technology enables wireless measurements up to 600-700$^\circ$C at best. However, the applicability of such sensors remains incomplete since they do not allow identification above 400$^\circ$C. The latter would require the use of a piezoelectric substrate providing a large electromechanical coupling coefficient K 2 , while being stable at high temperature. In this letter, we investigate the potentiality of stoichiometric lithium niobate (sLN) crystals for such purpose. Raman spectroscopy and X-ray diffraction attest that sLN crystals withstand high temperatures up to 800$^\circ$C, at least for several days. In situ measurements of sLN-based SAW resonators conducted up to 600$^\circ$C show that the K 2 of these crystals remains high and stable throughout the whole experiment, which is very promising for the future achievement of identifiable wireless high-temperature SAW sensors.
- Published
- 2019
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