Applied Physics Letters · 2012 · 23 citations · 17 references
Natural SciencesMaterials EngineeringMaterials ScienceCondensed Matter PhysicsPhase TransformationsSolid State PhysicsAmorphous MaterialsAmorphous SolidsPhase AnalysisPhase ChangePhase TransitionsSolid-state Phase TransitionsAmorphous AlloysAmorphous StructureHigh-pressure DiffractionMemory MaterialsPhase Transition PathwaysPhase-change BehaviorSynchrotron DiffractionSynchrotron X-ray Diffraction
A high-pressure synchrotron x-ray diffraction study of the phase change alloy Ge1Sb2Te4 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.
17
Phase-change materials for rewriteable data storage
Matthias Wuttig, Noboru Yamada · Nature Materials · 2007 · 3.6K citations