Sensor applications at high temperatures have been major factors motivating research, development, and commercialization of a number of innovative single-crystalline piezoelectric materials that are compositionally and structurally stable up to temperatures of 900 °C or more. These materials include ordered and disordered crystals in the langasite family, gallium orthophosphate, rare-earth calcium oxyborates, and crystals with the structure of melilite. In this review, measurements and analysis of the properties of these materials relevant to operation of piezoelectric acoustic sensors at elevated temperatures are summarized, with a primary focus on acoustic loss arising from temperature-dependent electrical conductivity.
Proceedings of the 17th AMA International Conference on Sensors and Measurement Technology (SENSOR 2015)
May 19-21, 2015
17th AMA International Conference on Sensors and Measurement Technology (SENSOR 2015)
Acoustic sensors, piezoelectric materials, high temperatures, langasite, langatate, gallium orthophosphate, CTGS, gallium phosphate, rare-earth oxyborates, calcium aluminate silicate