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Ikeda, Aniya SSI 180 _2009_ 522 Final Version .pdf708KbAdobe PDFView/Open
Title :A model for the temperature dependence of the viscosity in Cu–As–Se system
Authors :Ikeda, Masahiro
Aniya, Masaru
Issue Date :14-May-2009
Citation jtitle :Solid State Ionics
vol. :180
no. :6-8
start page :522
end page :526
Abstract :The microscopic bonding behavior of amorphous Cux(As2Se3)1−x (x = 0.00, 0.01, 0.05, 0.10 and 0.20) is studied from the point of view of the viscosity. The model used in this analysis describes the temperature dependence of the viscosity in terms of the mean bond strength E0, the mean coordination number Z0, and their fluctuations ΔE, ΔZ of the structural units that form the melt. The model reproduces quite well the temperature dependence of the viscosity of Cux(As2Se3)1−x observed experimentally. According to the theory, the fragility of the system increases as the fluctuation of the total bond strength increases. It is shown that the viscous flow is accompanied by the cooperative movements of the structural units and occurs by breaking selectively the weaker parts of the bonds between the structural units. This notion is related to the concept of Cooperatively Rearranging Region (CRR) in the theory of Adam–Gibbs. By analyzing the model, the fluctuation of the total bond strength in Cu–As–Se system is evaluated quantitatively, and the composition dependence of the fragility is discussed in terms of bond strength and the coordination number between the structural units. The analysis suggests that in the Cux(As2Se3)1−x system, there must be a strong composition dependence in the bond strength and a weak composition dependence in the fragility and coordination number fluctuation.
Type Local :雑誌掲載論文
Publisher :Elsevier BV
Rights :Elsevier B.V.
URI :http://hdl.handle.net/2298/11670
Relation :http://www.elsevier.com/locate/ssi
Appears in Collections:Journal Article (Sciende)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2298/11670