Thermal analysis of Li2-хNaxGe4O9 glasses crystallization

Анотація

The glasses of lithium-sodium tetragermanate LiNaGe₄O₉ and solid solution Li_1.8Na_0.2Ge₄O₉ were prepared by quenching the melt and crystallized on heating. The glass crystallization was controlled by differential scanning calorimetry and thermal gravimetric analysis. The DSC measurements performed in the range 300–1200 K show that the crystallization of the glasses occurs through a single stage. There are no anomalies on TGA dependences. It is assumed that LiNaGe₄O₉ and Li_1.8Na_0.2Ge₄O₉ glasses crystallize in accordance with a polymorphic mechanism.