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BAW temperature sensitivity and coupling in langanite.

Mauricio Pereira da Cunha1, Eric L Adler, Donald C Malocha

  • 1Department of Electrical and Computer Engineering, University of Maine, Orono 04469-5708, USA. mdacunha@eece.maine.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|June 6, 2002
PubMed
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Langanite (LGN) crystals offer superior performance for bulk acoustic wave (BAW) devices due to their low temperature sensitivity and high electromechanical coupling. These properties make LGN a promising alternative to quartz for advanced electronic applications.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Langanite (La3Ga5.5Nb0.5O14, LGN) is a trigonal crystal similar to langasite (La3Ga5SiO14, LGS).
  • LGN exhibits desirable material properties including lower thermal expansion and comparable piezoelectric constants to LGS.
  • These characteristics are crucial for applications in surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices, particularly those needing minimal temperature-induced frequency drift.

Purpose of the Study:

  • To comprehensively investigate the material characteristics of langanite (LGN) single crystals.
  • To identify optimal crystal orientations for BAW device applications, focusing on temperature stability and electromechanical coupling.
  • To compare the performance potential of LGN with established materials like AT-cut quartz.

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Main Methods:

  • Detailed analysis of LGN properties including phase velocity, temperature coefficient of frequency (TCF), and electromechanical coupling coefficient.
  • Examination of both singly and doubly rotated plate cuts.
  • Construction of contour plots to visualize characteristic variations across different orientations.

Main Results:

  • Identification of specific LGN orientations with zero TCF and high electromechanical coupling coefficients, reaching up to 0.16.
  • Prediction of temperature-compensated cuts with cubic temperature behavior around room temperature.
  • Demonstration that LGN's coupling coefficients are approximately twice those of AT-cut quartz.

Conclusions:

  • Langanite (LGN) is a highly promising material for BAW devices requiring low temperature sensitivity and superior bandwidth.
  • The identified temperature-compensated cuts in LGN offer significant advantages over traditional materials like quartz.
  • Further exploration of LGN orientations is warranted for practical BAW device design and optimization.