Se-doped GeTe4 glasses for far-infrared optical fibers

被引:11
|
作者
Svoboda, Roman [1 ]
Brandova, Daniela [1 ]
Chromcikova, Maria [2 ]
Setnicka, Michal [2 ]
Chovanec, Jozef [2 ]
Cerna, Andrea [2 ]
Liska, Marek [2 ]
Malek, Jiri [1 ]
机构
[1] Univ Pardubice, Fac Chem Technol, Dept Phys Chem, Studentska 573, Pardubice 53210, Czech Republic
[2] FChPT STU, TnUAD, Vitrum Laugaricio Joint Glass Ctr IIC SAS, Studentska 2, Trencin 91101, Slovakia
关键词
Ge-Se-Te glasses; Glass transition; Crystallization; Thermal stability; DSC; TMA; ENTHALPY RELAXATION; STRUCTURAL RELAXATION; GE-TE; THERMAL-BEHAVIOR; RAMAN-SPECTRA; DSC CYCLES; CRYSTALLIZATION; SUBSTITUTION; DYNAMICS; SYSTEM;
D O I
10.1016/j.jallcom.2016.11.139
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used to study thermokinetic behavior of Ge21SeyTe79-y infrared glasses (for y up to 8 at.% of Se). Glass transition kinetics was described in terms of the Tool-Narayanaswamy-Moynihan model and the relaxation motions were interpreted using Raman spectroscopy data. Both enthalpy and volume relaxation kinetics were found to be uninfluenced by Se addition. On the other hand, DSC crystallization behavior changed significantly with increasing Se content: initial addition of Se partially delays and decelerates both the initial Te precipitation and the consequent volume-located crystallization of GeTe and Te; additional increase of Se content then further delays and separates the volume-located crystallization processes but the initial surface Te precipitation is no longer affected. From this point of view the fine compositional tuning of basic thermal stability of Ge-Te-Se infrared glasses appears meaningless. On the contrary, glass workability window (determined by means of the TMA crystallization experiments) was found to be significantly affected by Se addition, emphasizing the importance of this type of measurements for the glass technology and material science. The 4 at.% Se content was found optimal with respect to fiber-drawing procedure. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:2434 / 2443
页数:10
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