Observation of polyamorphism in the phase change alloy Ge 1Sb 2Te 4

B. Kalkan; S. Sen; J. Y. Cho; Y. C. Joo; S. M. Clark

doi:10.1063/1.4759106

Observation of polyamorphism in the phase change alloy Ge 1Sb 2Te 4

B. Kalkan^*, S. Sen, J. Y. Cho, Y. C. Joo, S. M. Clark

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

A high-pressure synchrotron x-ray diffraction study of the phase change alloy Ge ₁Sb ₂Te ₄ demonstrates the existence of a polyamorphic phase transition between the as deposited low density amorphous (LDA) phase and a high density amorphous (HDA) phase at ∼10 GPa. The entropy of the HDA phase is expected to be higher than that of the LDA phase resulting in a negative Clapeyron slope for this transition. These phase relations may enable the polyamorphic transition to play a role in the memory and data storage applications.

Original language	English
Article number	151906
Pages (from-to)	1-5
Number of pages	5
Journal	Applied Physics Letters
Volume	101
Issue number	15
DOIs	https://doi.org/10.1063/1.4759106
Publication status	Published - 8 Oct 2012

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AB - A high-pressure synchrotron x-ray diffraction study of the phase change alloy Ge 1Sb 2Te 4 demonstrates the existence of a polyamorphic phase transition between the as deposited low density amorphous (LDA) phase and a high density amorphous (HDA) phase at ∼10 GPa. The entropy of the HDA phase is expected to be higher than that of the LDA phase resulting in a negative Clapeyron slope for this transition. These phase relations may enable the polyamorphic transition to play a role in the memory and data storage applications.

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Observation of polyamorphism in the phase change alloy Ge 1Sb 2Te 4

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