Low phonon glass-ceramic materials with Ba4Er3F17 and Ba3Te4O11 nanocrystalline phases
LESNIAK M. 1, STARZYK B. 1, JIMENEZ G. 1, KOCHANOWICZ M. 2, KUWIK M. 3, PISARSKA J. 3, PISARSKI W. 3, DOROSZ D. 1,3
1 Faculty of Materials Science and Ceramics, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Krakow, Poland, Krakow, Poland; 2 Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, Bialystok, Poland, Bialystok, Poland; 3 Institute of Chemistry, University of Silesia, Szkolna 9, 40-007 Katowice, Poland, Katowice, Poland
Transparent active glass-ceramic materials belong to advanced optical systems in which rare-earth (RE) doped nanocrystals are embedded in an amorphous matrix. The crystalline environment of RE ions has a significant role in shaping the optical properties of active materials leading to high absorption and emission cross sections and reduction of the non-radiative relaxation. However, developing the material processing techniques that enable reaching a high level of compositional and nanostructural control over the rare-earth doped nanocrystals is still a challenge. In practice, even a significant part of the active dopants is incorporated in the crystalline phase, the rest is located in the parent glassy matrix [1]. Moreover, the well-known transparent glass-ceramic systems usually consist of SiO2 glass-forming oxide. In contrast with silicate transparent glass-ceramics, the glassy matrix based on other oxides like TeO2 and GeO2 can be functional in the mid-infrared up to ~ 5 µm [2].
In the talk, the novelty of tellurite, and tellurite-germanate glass-ceramics will be discussed. It originates from the flexibility of compositional modification in the above glasses as well as the opportunity for different nanocrystalline phase precipitation with unique structures and properties.
It will be addressed during the talk, luminescence and structural results for the tellurite transparent glass-ceramics in multicomponent TeO2-P2O5-BaF2-SrF2-ZnF2-Na2O-Er2O3 and TiO2-GeO2-BaO-Ga2O3-TeO2-Eu2O3 systems. The control over the heat-treatment process helps to attain the glass-ceramics with retention of optical transparency with Ba4Er3F17 and Ba3Te4O11 nanocrystals, respectively. The results for the TeO2-P2O5-based system will be presented in relation to the various BaF2/SrF2 molar ratio and compared to our previous study [3].
Going beyond the traditional heat-treatment method, the billet extrusion technique will be shown as a technique for control manufacturing transparent glass-ceramic in an oxyfluoride tellurite-germanate system with low phonon fluoride nanocrystals. Finally, the first laser writing trials will be reported as induced element redistribution as a perspective method for controlling glass crystallization in tellurite, and germanate glasses.
Acknowledgement: The research activity was granted by the National Science Centre, Poland No. 2020/39/D/ST5/02287.
References:
[1] T.N.L. Tran, A. Szczurek, A. Carlotto, et al. Sol-gel-derived transparent glass-ceramics for photonics. Optical Materials, 130 (2022) 112577.
[2] M. Hongisto, A. Veber, Y. Petit, et al. Radiation-Induced Defects and Effects in Ger-manate and Tellurite Glasses. Materials, 13 (2020), 3846.
[3] M. Lesniak, J. Zmojda, M. Kochanowicz, et. al. Spectroscopic Properties of Erbium-Doped Oxyfluoride Phospho-Tellurite Glass and Transparent Glass-Ceramic Containing BaF2 Nanocrystals. Materials, 2019, 12(20), 3429.