Second-order optical nonlinearity and ionic conductivity of nanocrystalline GeS2-Ga2S3-LiI glass-ceramics with improved thermo-mechanical properties.

Changgui Lin (1) , Laurent Calvez (1) , Bruno Bureau (1) , Haizheng Tao (2) , Mathieu Allix (3) , Zhangxiang Hao (2) , Vincent Seznec (4) , Xianghua Zhang (1) , Xiujian Zhao (2)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 KEY LAB SILICATE MAT & ENGN
3 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
4 LRCS - Laboratoire réactivité et chimie des solides - UMR CNRS 7314

IR-transparent chalcogenide glass-ceramics were fabricated through a careful ceramization process of the as-prepared 65 GeS(2) x 25 Ga(2)S(3) x 10 LiI glasses at a temperature of 403 degrees C for various durations. Owing to the precipitation of Li(x)Ga(y)S(z) crystals with a Ga(2)S(3)-like structure, clear second-harmonic generation was observed in the sample crystallized at 403 degrees C for 60 h, which has a greatly improved resistance to environmental impairment. Additionally, it is found that the shorter crystallization process (< or = 60 h) contributed to the enhancement of Li(+) ionic conductivity, whereas a longer heat-treatment (80 h) would impair that of the glass-ceramics. The micro-structural origin of these varied properties was elucidated in detail. The corresponding results will be of benefit for the optimization of designed transparent chalcogenide glass-ceramics with improved thermo-mechanical properties, a permanent second-order optical nonlinearity, or a well-enhanced ionic conductivity for application in amorphous solid electrolytes.

Domaines: Matériaux

Changgui Lin, Laurent Calvez, Bruno Bureau, Haizheng Tao, Mathieu Allix, et al.. Second-order optical nonlinearity and ionic conductivity of nanocrystalline GeS2-Ga2S3-LiI glass-ceramics with improved thermo-mechanical properties.. Physical Chemistry Chemical Physics, 2010, 12 (15), pp.3780-7. ⟨10.1039/b921909a⟩. ⟨hal-00608320⟩