Non-isothermal crystallization of LiNaGe4O9 glass

  • Ye. V. Skrypnik Oles Honchar Dnipro National University, Dnipro, Ukraine
  • M. P. Trubitsyn Oles Honchar Dnipro National University, Dnipro, Ukraine
  • A. O. Diachenko Oles Honchar Dnipro National University, Dnipro, Ukraine
  • M. D. Volnianskii Oles Honchar Dnipro National University, Dnipro, Ukraine
Keywords: glass crystallization, lithium-sodium tetragermanate LiNaGe4O9, differential scanning calorimetry, thermal gravimetric analysis

Abstract

The glass of lithium-sodium tetragermanate LiNaGe4O9 is crystallized on heating under the control of differential scanning calorimetry and thermal gravimetric analysis. The measurements were prepared in the temperature range 300-870 K and showed the relatively weak endothermic DSC anomaly and 40-50 K above the single exothermic peak. The endothermic anomaly observed at Tg testified to softening the glass structure whereas the exothermic peak at TC manifested crystallization of the amorphous phase. Studying of TGA demonstrated smooth nearly linear dependences without any visible anomalies. Varying the heating rate from 1.2 up to 40 K/min resulted in noticeable increase of the characteristic temperatures Tg and TC. Lower limit of the glass transition temperature Tg0 was estimated with the help of the existing model. The mechanism of the LiNaGe4O9 glass crystallization is discussed.

Published
2021-09-07
Section
Articles