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Diffusion-related implications for langasite resonator operation.

Michal Schulz1, Holger Fritze, Harry L Tuller

  • 1Department of Physics, Metallurgy and Materials Science, Technische Universität Clausthal, Clausthal-Zellerfeld, D-38678 Germany. michal.schulz@tu-clausthal.de

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 17, 2004
PubMed
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Oxygen vacancies significantly influence langasite conductivity, as shown by oxygen and gallium diffusion studies. Gallium diffusion is much slower than oxygen diffusion, with minimal impact on resonator performance.

Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Semiconductor Physics

Background:

  • Langasite (LGS) is a material with potential applications in electronic devices.
  • Understanding diffusion mechanisms is crucial for optimizing LGS properties.
  • Electrical conductivity in LGS is influenced by ionic defects.

Purpose of the Study:

  • To experimentally determine oxygen and gallium diffusivities in langasite.
  • To investigate the role of oxygen vacancies in langasite's electrical conductivity.
  • To assess potential limitations and accuracy of diffusion measurements.

Main Methods:

  • Secondary Ion Mass Spectrometry (SIMS) analysis of 18O and 71Ga tracer diffusion profiles.
  • Variable temperature and doping concentration experiments.

Related Experiment Videos

  • Surface exchange measurements.

    • Main Results:

    • Oxygen diffusivity is significantly higher than gallium diffusivity (by over two orders of magnitude).
    • Strontium doping enhances oxygen diffusion, with an activation energy of approximately 1.2±0.2 eV.
    • Gallium diffusion exhibits an activation energy of 3.13 eV.
    • Gallium loss at elevated temperatures is minimal and unlikely to affect resonator performance.

    Conclusions:

    • Oxygen vacancies are the primary factor controlling langasite's electrical conductivity at high temperatures and oxygen partial pressures.
    • The determined diffusion coefficients provide critical data for LGS material development.
    • Potential sources of experimental error, such as porosity and ion beam effects, were considered.