Defect properties of langasite and effects on BAW gas sensor performance at high temperatures

  • Seh H
  • Tuller H
  • Fritze H
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Abstract

The electrical and defect properties of langasite (La3Ga5SiO14) were studied as a function of temperature, oxygen partial pressure and dopants in order to characterize its electrical behavior in relation to its performance as a bulk acoustic wave (BAW) gas sensor operating at elevated temperatures. Undoped, 5%-Nb donor doped, and 1%-Sr acceptor doped langasite specimens were studied. A defect model, shown to be consistent with experimental observations, was used to extract key defect parameters for the system. Implications for device operation are discussed. © 2003 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Electrical properties
  • Impedance
  • Langasite
  • Sensors

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Authors

  • Huankiat Seh

  • Harry L. Tuller

  • Holger Fritze

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