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- W2897059880 abstract "Abstract A great number of piezoelectric materials which could be used in the fabrication of BAW resonators were investigated via colored picosecond acoustics technique in order to study the required parameters for designing and fabricating improved devices. These parameters concerns acoustic longitudinal velocity, vL, elastic stiffness constant, CD33, intrinsic mechanical loss, tanδ, and electromechanical coupling coefficient, k2t. We first quantify the effect of the ratio between the wavelength pulse of a femtosecond laser and the period of Brillouin oscillations, λp/T. It is found that CD33 depends linearly on λp/T. Then, we deduced novel relations for stiffness constant and mechanical coupling coefficient. Moreover, the determination of different parameters (density, refractive index and vL) of piezoelectric film is achieved, with good agreement with literature. The optimized conditions for the parameter choice of BAW resonators are found to be: 300 GPa 37 103 m/s where e33 and es33 are the piezoelectric constant and the materials permittivity in the direction 3, respectively." @default.
- W2897059880 created "2018-10-26" @default.
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- W2897059880 date "2018-12-01" @default.
- W2897059880 modified "2023-09-24" @default.
- W2897059880 title "Criteria determination to choose piezoelectric materials for BAW resonator applications via colored picosecond acoustics" @default.
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- W2897059880 doi "https://doi.org/10.1016/j.cjph.2018.10.008" @default.
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