Resonant bonding in crystalline phase-change materials.

By K. Shportko, S. Kremers, M. Woda, D. Lencer, John Robertson, Matthias Wuttig. Nature Materials, 2008

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A map for phase-change materials. (2008, background): “Recently it was shown that resonance bonding in the crystalline state is a unique fingerprint of phase-change material”
The Crystal Orbital Hamilton Population (COHP) Method as a Tool to Visualize and Analyze Chemical Bonding in Intermetallic Compounds (2018, background): “Because the measurements of the dielectric functions for phase-change materials revealed that the optical dielectric constants are evidently higher for crystalline than for the amorphous phases, it was inferred that the sorts of bonding significantly change between the two phases [118].”
Inorganic Salt Hydrate for Thermal Energy Storage (2017, background): “NH4Cl, NaCl, KCl and NH4Br etc are mainly additional salt that can add to other PCMs to decrease melting point according to their abilities to weaken the hydrogen bond among water molecule [84,85].”
Spatiotemporal light control with active metasurfaces (2019, background): “This is well known from its use as a storage medium in the digital versatile disc (DVD) (56, 57) and more recently in programmable metasurfaces.”