Langasite-Type Resonant Sensors for Harsh Environments

Published

February 16, 2016

Author(s)

Yuriy Suhak, Michal Schulz, Hendrik Wulfmeier, Ward Johnson, Andrei Sotnikov, Hagen Schmidt, Steffen Ganschow, Detlef Klimm, Holger Fritze

Abstract

Operation of single crystalline Ca3TaGa3Si2O14 (CTGS) and La3Ga5SiO14 (LGS) bulk acoustic wave resonators is demonstrated up to 1270 °C and 1470 °C, respectively. The mass sensitivity of such devices is about 35 cm^2Hz/ug at 800 °C. Therefore, they are sensitive transducers suited to monitoring, for example, mass deposition processes at high temperatures. The electromechanical loss in CTGS is found to be significantly lower than that in LGS. Platinum coated CTGS samples show a remarkable long-term stability at 1000 °C in air. After an initial period of 300 h, the conductivity is found to remain nearly constant for at least 2400 h. Measurements of resonance frequency of CTGS for 1000 h show a qualitatively similar sequence, with an initial systematic increase followed by nearly constant values. In contrast, measurements on platinum coated LGS plates show a conductivity decreasing by 15 % over a period of 5000 h.

Citation

MRS Advances

Volume

1

Pub Type

Journals

Download Paper

https://doi.org/10.1557/adv.2016.109

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Keywords

acoustic loss, acoustic properties, acoustic resonance, acoustic sensors, CTGS, electrical conductivity, dielectric constants, high temperature, langasite, piezoelectrics, single crystal

Citation

Suhak, Y. , Schulz, M. , Wulfmeier, H. , Johnson, W. , Sotnikov, A. , Schmidt, H. , Ganschow, S. , Klimm, D. and Fritze, H. (2016), Langasite-Type Resonant Sensors for Harsh Environments, MRS Advances, [online], https://doi.org/10.1557/adv.2016.109, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919874 (Accessed October 15, 2026)

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