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**6** 

*Turkey* 

*Istanbul Technical University* 

**Crystallization Kinetics of Amorphous Materials** 

Amorphous (non-crystalline) materials have no crystal structure where the atoms appear to have a random distribution (Omar, 1993). There are different classes of amorphous materials. Glasses, inorganic materials which have no long-range order (<10 Å) and high viscosity greater than 1013 Poise, are the most typical amorphous materials (Doremus, 1973; Jackson, 2004; Park, 2009). The regular arrangement resulting from the distribution over long distances of a repeating atomic arrangement, which is characteristic of a crystal, is missing in glasses (see Fig. 1). However, there is often evidence of a short-range order in glasses, which corresponds to the atomic arrangement in the immediate vicinity of any

(a) (b)

Fig. 1. Schematic two-dimensional illustration of the atomic arrangement in (a) crystal and

Glass can be formed by cooling from a liquid state without a change in its specific volume, which delays crystallization and assist to reach the glass transition temperature before the crystallization occurs (Jackson, 2004; Park, 2009). This is why amorphous materials, such as

In a liquid, the atoms or molecules move around much more rapidly than in a crystal. They are constantly in motion, jiggling around relative to each other, unlike in a crystal, where the

glasses, are sometimes referred to as supercooled liquids (Omar, 1993).

**1. Introduction** 

selected atom (Carter & Norton, 2007).

(b) glass (Carter & Norton, 2007)

Miray Çelikbilek, Ali Erçin Ersundu and Süheyla Aydn

