The reflected light intensity (IR) from the solid and liquid phases of Ge–Sb–Te alloy has been statically measured. IR rapidly decreased after crossing the melting point during the heating process, and increased to its initial intensity level after solidifying during the cooling process. A special sample preparation technique using a quartz cell enabled reliable measurements to be carried out. The structure and composition of the Ge–Sb–Te alloy was investigated using Raman scattering and X-ray fluorescence after the melting process. Germanium was found to preferentially diffuse from the bulk to the surface leading to a germanium oxide surface phase.
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Kuwahara et al. (2007) studied this question.
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