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	Effects of chemical composition and mean coordination number on glass transitions in Ge-Sb-Se glasses
	Wei, Wen-Hou
	2017-12-30
摘要	Glass transitions in the Ge-Sb-Se glasses were investigated by means of differential scanning calorimetry (DSC) under non-isothermal conditions. The glass transition temperature (T-g), activation energy of glass transition (E-t), and fragility index as functions of the mean coordination number (MCN) and atomic percent of Ge were examined. The maximum value of T-g in each group of the glasses occurred at the chemically stoichiometric composition, suggesting a glass transition threshold. The E-t and fragility index were calculated from the heating rate dependence of T-g. Both E-t and fragility index show the minima at MCN = 2.4 which can be attributed to the structural phase transition of a covalently glassy network at MCN = 2.4. The analysis of the experimental results suggests that both the chemical composition and MCN have significant effects on the glass transitions in Ge-Sb-Se glasses.
关键词	Chalcogenide glass Ge-Sb-Se MCN glass transition glass stability
DOI	10.1142/S0217984917503420
发表期刊	MODERN PHYSICS LETTERS B
ISSN	0217-9849
卷号	31期号:36页码:10
收录类别	SCI
WOS记录号	WOS:000418036800003
语种	英语