The electrical and defect properties of langasite (La3Ga5SiO14) were studied as a function of temperature, oxygen partial pressure and dopants in order to characterize its electrical behavior in relation to its performance as a bulk acoustic wave (BAW) gas sensor operating at elevated temperatures. Undoped, 5%-Nb donor doped, and 1%-Sr acceptor doped langasite specimens were studied. A defect model, shown to be consistent with experimental observations, was used to extract key defect parameters for the system. Implications for device operation are discussed. © 2003 Elsevier Ltd. All rights reserved.
Seh, H., Tuller, H. L., & Fritze, H. (2004). Defect properties of langasite and effects on BAW gas sensor performance at high temperatures. Journal of the European Ceramic Society, 24(6), 1425–1429. https://doi.org/10.1016/S0955-2219(03)00464-3