With excellent chemical stability, a high quality factor, and no ferroelectricity, LGT is ideally suited for advanced piezoelectric applications in resonators, sensors, and transducers.
Langatate and quartz have similar advantages:
• No ferroelectricity.
• Same point symmetry group as quartz, hence an easy transposition of the well-known models of the quartz.
• Excellent chemical and mechanical stability.
But LGT has other outstanding properties:
· Resistant at very high temperature (> 600°C) as it does not show any phase transition to its fusion point ( about 1470 °C)
• Higher Q factor (for resonators)
· Better piezoelectric constants (for sensors)
· Higher coupling coefficient (for transducers)
· Easy transposition from quartz models → faster design cycles
Langatate (or LGT) is a piezoelectric material that belongs to the same symmetry class as quartz.
This is an advantage as all the well-known models developed on quartz can be easily transfered. It is a very stable material (mechanical and chemical) without any phase transition up to its melting temperature (~1500°C) which allows the use of langatate for harsh environment and also for the high temperature steps sometimes required during the fabrication of components.
In addition, langatate is a non-pyroelectric and non-ferroelectric material. Its figures of merit make an excellent candidate for various applications : direct piezoelectric sensors, SAW sensors, resonators, transducers, accelerometers...
