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Phase-change materials: Empowered by an unconventional bonding mechanism

Published online by Cambridge University Press:  05 September 2019

J. Pries ,
O. Cojocaru-Mirédin  and
M. Wuttig
J. Pries
Affiliation:
Institute of Physics IA, RWTH Aachen University, Germany; pries@physik.rwth-aachen.de
O. Cojocaru-Mirédin
Affiliation:
Institute of Physics IA, RWTH Aachen University, Germany; cojocaru-miredin@physik.rwth-aachen.de
M. Wuttig
Affiliation:
Institute of Physics IA, RWTH Aachen University; and JARA-Institute, Energy-Efficient Information Technology (Green IT), Germany; wuttig@physik.rwth-aachen.de
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Abstract

Phase-change materials (PCMs) have demonstrated a wide range of potential applications ranging from electronic memories to photonic devices. These applications are enabled by the unconventional portfolio of properties that characterizes crystalline PCMs. Here, we address the origin of these unusual properties and how they are related to the application potential of these materials. Evidence will be presented that the properties are related to an unconventional bonding mechanism. Employing a novel map, which separates solids according to the number of electrons transferred and shared between adjacent atoms, it is shown that PCMs occupy a well-defined region. Depicting physical properties such as the optical dielectric constant as the third dimension in the map reveals systematic property trends. Such trends can be utilized to unravel the origins of the unconventional materials properties or alternatively, as a means to optimize them.

Keywords

calorimetrybondingmemorySeTe
Type
Phase-Change Materials in Electronics and Photonics
Information
MRS Bulletin , Volume 44 , Issue 9: Phase-Change Materials in Electronics and Photonics , September 2019 , pp. 699 - 704
Copyright
Copyright © Materials Research Society 2019 

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