Abstract
Langasite La3Ga5SiO14 (noted LGS) is a piezoelectric material presenting a strong electromechanical deformation at high temperature (up to 1,000–1,200°C). Classical solid state reaction at high temperature (1,450°C) is generally needed to synthesize the LGS phase. In this study, we present a new synthesis way for polycrystalline langasite (LGS), involving a series of specific thermal cycles at moderate temperatures (<1,200°C). The final langasite phase is then characterized by X-ray diffraction, scanning electron microscopy and infrared spectroscopy. FTIR observed vibration modes are commented in relation with literature results.
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