Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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L.N.Truong, M.Dussauze, M.Allix, S.Chenu, T.Cardinal E.Fargin, L.F.Santos, 'Second Harmonic Generation in Germanotellurite bulk glass ceramics', J. Am. Ceram. Soc. 100 1412-1423 (2017) doi:10.1111/jace.14745

In this study, we have investigated the use of silver cation as nucleating agent in germanotellurite glass matrix of compositions (100x) [70TeO2–10GeO2– 10Nb2O5–10K2O]–xAg2O (x=0-6 mol%), in order to promote bulk crystallization. Density measurements, differential scanning calorimetry, X-ray diffraction, UVVis, and Raman spectroscopies have been performed to study the crystallization process. We have observed bulk crystallization of a unique noncentrosymmetric phase, K[Nb1/3Te2/3]2O4.8, which has been investigated for its second-order optical activity. Transparent to translucent glass-ceramics have been successfully tailored under thermal treatment and second harmonic generation signals were recorded on the glass-ceramic samples as a function of their synthesis procedure. It is suggested that the second-order optical properties observed are strongly related to the organization of crystallites within phase-separated domains.