Fragility of chalcogenide glass in relation to characteristic temperature T0/Tg

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Shaker, A.M.^1 ; Shanker Rao, T.^2 ; Lilly Shanker Rao, T.^3 ; Venkataraman, K.^4

Physics Department, K J Somaiya College of Science and Commerce, Vidyavihar, Mumbai

400077, India^1

Physics Department, Narmada College of Science and Commerce, Bharuch

Gujarat

392011, India^2

Electronics Department, Narmada College of Science and Commerce, Bharuch

Gujarat

392011, India^3

Physics Department, PMB Gujarati Science College, Indore

452001, India^4

关键词: Amorphous glass;    Calculated values;    Chalcogenide glass;    Characteristic temperature;    Dsc(differential scanning calorimetry);    Fragility index;    Glass forming materials;    Vogel-Fulcher-Tammann equation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012004/pdf
DOI  :  10.1088/1757-899X/330/1/012004

来源: IOP

【 摘 要 】

The present study reports the mutual relationship between the fragility index m and the characteristic temperature T0/Tg. The fragility of the chalcogenide amorphous glass of Ge10Se50Te40is calculated by utilizing glass transition temperature (Tg) measured by DSC (Differential Scanning Calorimetry) at different heating rates (β) in the range 5 to 20 K/min. Vogel-Fulcher-Tammann (VFT) equation is fitted to the data of Tg. In addition to the VFT method, three other methods are also used to evaluate m. The fragility index m of the Ge10Se50Te40system showed the trend of decrease with increasing heating rate but remained stable around 22 for the heating rate 10 K/min. The value of m for the glass is near the lower limit (m ≈ 16) this indicates the alloy is a strong glass forming material in accordance of Angell's interpretation of fragility. The calculated values of characteristic temperature T0/Tgis very close to 1 which also indicates that clearly the system is most fragile.