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Acoustic Emission from Organic Martensites
Author(s) -
Panda Manas K.,
Etter Martin,
Dinnebier Robert E.,
Naumov Panče
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201702359
Subject(s) - materials science , acoustic emission , diffusionless transformation , anisotropy , context (archaeology) , shape memory alloy , intermolecular force , crystal (programming language) , chemical physics , martensite , condensed matter physics , composite material , molecule , optics , chemistry , microstructure , organic chemistry , paleontology , physics , computer science , biology , programming language
In salient effects, still crystals of solids that switch between phases acquire a momentum and are autonomously propelled because of rapid release of elastic energy accrued during a latent structural transition induced by heat, light, or mechanical stimulation. When mechanical reconfiguration is induced by change of temperature in thermosalient crystals, bursts of detectable acoustic waves are generated prior to self‐actuation. These observations provide compelling evidence that the thermosalient transitions in organic and organic‐containing crystals are molecular analogues of the martensitic transitions in some metals, and metal alloys such as steel and shape‐memory alloys. Within a broader context, these results reveal that, akin to metallic bonding, the intermolecular interactions in molecular solids are capable of gradual accrual and sudden release of a substantial amount of strain during anisotropic thermal expansion, followed by a rapid transformation of the crystal packing in a diffusionless, non‐displacive transition.