BAW temperature sensitivity and coupling in langanite

Growth of a New Ordered Langasite Structure Crystal Ca3TaAl3Si2O14

“…In the last two decades, the langasite family including La 3 Ga 5 SiO 14 (LGS), Sr 3 Ga 2 Ge 4 O 14 (SGG), La 3 Nd 0.5 Ga 5.5 O 14 (LGN), and La 3 Ta 0.5 Ga 5.5 O 14 (LGT) belonging to point group 32, space group P 321 with A 3 BC 3 D 2 O 14 structure has attracted increasing attention because of its excellent properties in applications of surface acoustic wave, bulk acoustic wave, and sensors fields. – But with further study on LGS, LGN, LGT, and SGG, several disadvantages of these materials have been found . The “disordered” structure of these compounds will cause the randomly distributed distortion of crystal structure leading to the lower achievable acoustic Q and electromechanical coupling.…”

Resonance behavior of langanite and langatate plates driven by lateral field excitation

“…6 and 7 are the potential for eliminating unwanted modes and for achieving greater coupling magnitudes versus TFE by appropriate adjustment of y~. These features are particularly significant when we consider that a doubly rotated cut of LGN with similar rotation angles, i.e., 4 = 26.9", 8 = 43.26", has been recently predicted to be temperature compensated for the C mode by da Cunha, et al [19]. Specifically, they predicted a cubic frequency change versus temperature response for the C mode around room temperature for this cut making it of potential practical interest.…”