Related Experiment Video
Updated: May 2, 2026
07:55
Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
Published on: June 18, 2020
12.1K
Iridium interdigital transducers for high-temperature surface acoustic wave applications
Summary
Iridium shows promise for high-temperature Surface Acoustic Wave (SAW) devices up to 1000°C. Beyond this, langasite substrate degradation limits performance due to material loss.
Area of Science:
- Materials Science
- Solid State Physics
- Device Engineering
Background:
- Investigating iridium as a metal for interdigital transducers (IDTs) in Surface Acoustic Wave (SAW) devices for high-temperature applications.
- Fabrication and electrical characterization of SAW delay lines utilizing iridium IDTs and langasite (LGS) substrates.
Discussion:
- Reliable frequency responses were observed for SAW devices up to 1000°C.
- Significant increase in insertion losses and signal vanishing occurred between 1140°C and 1200°C.
- Surface transformation of the LGS crystal, including gallium and oxygen loss, was identified as the cause of performance degradation.
Key Insights:
- Iridium is a viable material for high-temperature SAW device IDTs.
- Langasite substrates exhibit surface degradation at extreme temperatures (>1000°C).
- Material loss (Ga, O) from LGS is the primary failure mechanism at elevated temperatures.
Outlook:
- Further research into protective coatings or alternative substrates for enhanced high-temperature stability.
- Exploring other refractory metals for IDT applications in extreme environments.
- Optimizing LGS crystal growth or surface treatments to mitigate degradation.
