Sintered translucent ceramics of undoped and Nd3+-doped BaLaLiWO6 and BaLaNaWO6 perovskite-type tungstates
PROKOP K. 1,2, COTTRINO S. 3, LE FLOCH S. 4, GARNIER V. 3, FANTOZZI G. 3, GUYOT Y. 4, BOULON G. 4, GUZIK M. 1,2
1 University of Wroclaw, Faculty of Chemistry, ul. Joliot-Curie 14,50-383 , Wroc?aw, Poland; 2 ?ukasiewicz Research Network – PORT Polish Center for Technology Development, ul. Stab?owicka 147, 54-066 , Wroc?aw, Poland; 3 Univ Lyon, INSA Lyon, UCBL, CNRS, MATEIS, UMR 5510, 7 avenue Jean Capelle, 69621, Villeurbanne, Lyon, France; 4 Univ Lyon, Institute Light Matter (iLM), UMR 5306 CNRS-Claude Bernard/Lyon1 University, 69622 Villeurbanne, Lyon, France
New materials for production of optical transparent ceramics could be AA'BB'O6 perovskite-type tungstates, which are widely examined and applied for practical uses as powders or single crsytals, but not known so far as sintered materials showing transparency.
Best potential candidates for transparent ceramics should possess highly symmetric crystal systems. As BaLaLiWO6 and BaLaNaWO6 are characterized by a cubic structure (space group , No. 225), they seem to be good candidate
to reach transparency.
Micro-powders (BaLaLiWO6 and BaLaNaWO6) showing good homogeneity and grain size of several micrometers obtained via solid-state reaction were used as starting materials.
First translucent ceramics were fabricated using Spark Plasma Sintering (SPS) and High Pressure Spark Plasma Sintering (HP-SPS) methods. Sintering of powders undoped and doped with Nd3+ ion were performed. This ion is very important from the potential application point of view i.e. as a laser dopant and as structural probe. Thermal analysis i.e. TGA, High-Temperature X-Ray Diffraction (HT-XRD) were performed to select the optimal sintering conditions (temperature, ramp, dwell time). Structural analysis of raw powders and sintered materials was performed by XRD and SEM techniques. The obtained sintered ceramics show translucency and are composed of micrometric grains size with some residual intergranular porosity. Further optimization to improve the quality of the materials will be proposed.
