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Langasite-Type Resonant Sensors for Harsh Environments

Published online by Cambridge University Press:  09 February 2016

Yuriy Suhak ,
Michal Schulz ,
Hendrik Wulfmeier ,
Ward L. Johnson ,
Andrei Sotnikov ,
Hagen Schmidt ,
Steffen Ganschow ,
Detlef Klimm  and
Holger Fritze
Yuriy Suhak
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
Michal Schulz
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
Hendrik Wulfmeier
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
Ward L. Johnson
Affiliation:
National Institute of Standards and Technology, 325 Broadway St., Boulder, CO 80305, U.S.A.
Andrei Sotnikov
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, Dresden, 01069, Germany.
Hagen Schmidt
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, Dresden, 01069, Germany.
Steffen Ganschow
Affiliation:
Leibniz Institute for Crystal Growth, Max-Born-Str. 2, Berlin, 12489, Germany.
Detlef Klimm
Affiliation:
Leibniz Institute for Crystal Growth, Max-Born-Str. 2, Berlin, 12489, Germany.
Holger Fritze*
Affiliation:
Clausthal University of Technology, Am Stollen 19B, Goslar, 38640, Germany.
*
*(Email: holger.fritze@tu-clausthal.de)
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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 cm2 Hz/μg 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.

Keywords

piezoelectricsensorcrystal

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Type
Articles
Information
MRS Advances , Volume 1 , Issue 21: Nanomaterials and Synthesis , 2016 , pp. 1513 - 1518
Copyright
Copyright © Materials Research Society 2016 

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References

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