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Effect of Ag addition on crystallization in As2Se3glasses

โœ Scribed by M. Kitao; C. Gotoh; S. Yamada

Publisher
Springer
Year
1995
Tongue
English
Weight
496 KB
Volume
30
Category
Article
ISSN
0022-2461

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โœฆ Synopsis

Differential scanning calorimetry (DSC) behaviours of glassy As2Se3 containing Ag up to 5 at % were measured at various heating rates. The effect of addition of Ag on crystallization of glassy AszSe3 was investigated. The glass transition temperature decreased with increasing Ag content. Crystallization kinetics were analysed on the basis of the two-step process model, where crystal growth takes place after nucleation. For non-doped AszSes two-dimensional growth of crystal was predominant, while for Ag-doped ones threedimensional growth was very likely. It was supposed for all glassy Ag-doped samples that crystal nuclei exist, though micro-crystallites were not observed on X-ray diffraction traces. The activation energy for crystallization and the glass-forming tendency decreased by the addition of Ag.

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The short range structure analysis of (1 ฯช x)As 2 Se 3 -xAg 2 Se (x 0.05-0.30) glasses were studied by the time-of-flight (TOF) neutron diffraction method, and the effects of Ag 2 Se addition on the network structure of AsSe 3 trigonal pyramid were investigated. The As-Se and Se-Se distances of the