外文题目: Impact of tellurium on glass transition and crystallization in the Ge-Se-Te-Bi system
作者: Yin, Haiwei; Li, Lei; Liu, Yinyao; Hu, Lili; Zeng, Huidan; Chen, Guorong
刊名: Ceram. Int.
年: 2017 卷: 43 期: 4 页： 3556--3561
英文关键词:
Chalcogenide glasses; Thermoelectric crystals; Crystallization kinetics
CHALCOGENIDE GLASSES; THERMAL-ANALYSIS; KINETICS; STATE; PHASE; FILMS
英文摘要:
Samples with compositions of Ge(20)Se(67-x)Te(x)Bin (x=0, 5, 10, 15 and 20 mol%) were prepared and characterized by XRD, Raman spectroscopy and DSC. XRD patterns and Raman spectra present consistent evidences of glass transition and crystallization in association with the variation of the structure network due to the substitution of Te for Se. Precipitation of thermoelectric (TE) crystals experiences an evolution from Bi2Se2Te (BST) to Bi2SeTe2 (BTS) phases with the increasing Te content. Based on DSC data performed at five heating rates, crystallization kinetics is analyzed by using Kissinger's relation, Ozawa model and Augis-Bennett approximation. Different methods show the identical evaluations of characteristic activation energies (E-c), while additional parameters of frequency factor (K-0) and Avrami exponent (n) are available with AB method. In particular, calculated E-c and K-o demonstrate that with the substitution of Se by Te the crystallization process of the target TE BST crystal phase is much enhanced while that of the undesired GeSe2 phase is slightly hindered.


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1016/j.ceramint.2016.11.167


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