ORHUN, Cem Anadolu University - Graduate School of Science - Department of Ceramic Engineering, Turkey , DÖLEKÇEKİÇ, Emrah Anadolu University - Faculty of Engineering - Department of Material Science and Engineering, Turkey

INVESTIGATION ON THE EFFECT OF RARE EARTH (RE) CATION TO THE (RE+Ca)SiAlON GLASSES

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The main purpose of this study was to determine the change in density, glass transition temperature (Tg) and hardness as a result of compositional modifications in the (RE+Ca)SiAlON oxynitride glasses (RE= Er, Nd, Sm, Eu, Dy, Yb) with a cation ratio in eq% of (1+27):56:16 = (RE+Ca):Si:Al. The amount of nitrogen was kept constant (N=5 eq %). Additionally other series of the (Er+Y):Si:Al:O:N glasses with cation composition (3+25):56:16 were prepared with different amount of nitrogen (where N= 0, 5, 10 eq %) to observe the effect of nitrogen to glass transition temperature. X-Ray diffraction patterns proved that all produced glasses were amorphous. Tg and hardness results of (RE+Ca)SiAlON glasses were revealed that there is a linear relationship between cation field strength (CFS). Density results versus molecular weight and CFS were presented. Additionally, glass transition temperatures of the (Er+Y)SiAlON glasses were further increased with the increasing nitrogen content in the structure. These results are also compared with (RE+Ca)SiAlON glass series.

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Oxynitride glass , Rare earth effect , Nitrogen effect , Cation field strength (CFS).

Anadolu University Journal of Science and Technology. A : Applied Sciences and Engineering

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