High-temperature thin film lithium niobium oxide transducers for bolts |
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| Affiliation: | 1. Institute of Technological Sciences of Wuhan University, Wuhan, 430072, China;2. School of Power & Mechanical Engineering, Wuhan University, Wuhan, 430072, China;3. Centre for Advanced Composite Materials, Department of Mechanical Engineering, The University of Auckland, Auckland, 1142, New Zealand;4. Sumy State University, Sumy, 40007, Ukraine;5. Faculty of Physics, National University of Uzbekistan, Tashkent, 100174, Uzbekistan;6. Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia;7. Institute of Ion-Plasma and Laser Technologies, Uzbekistan Academy of Sciences, Tashkent, 100125, Uzbekistan |
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| Abstract: | In the present work, we studied structure, surface morphology, and ultrasonic response of thin film Lithium Niobium Oxide (LNO) transducers deposited on Inconel bolts, stainless steel and silicon substrates by radio frequency magnetron sputtering. The deposited transducer material was a mixture of LiNbO3/LiNb3O8 phases, having a well-developed columnar structure. Further, the in-situ high-temperature ultrasonic response was studied in the temperature range of 18–800 °C in ambient air during short-term annealing. It was observed that long-term annealing (at 700 °C for 160 h and 800 °C for 40 h) deteriorated the ultrasonic response, owing to the irreversible change from the initial columnar structure to the porous granular structure. Dielectric and piezoelectric properties of the thin film LNO transducers were also studied. The thin film LNO ultrasonic transducers have potential applications in bolts and screws up to 700 °C. |
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| Keywords: | High-temperature ultrasonic transducers Thin film Magnetron sputtering Lithium niobate Thermal durability High-temperature annealing |
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