Colossal positive and negative thermal expansion and thermosalient effect in a pentamorphic organometallic martensite

Manas K. Panda, Tomče Runčevski (), Subash Chandra Sahoo, Alexei A. Belik, Naba K. Nath, Robert E. Dinnebier and Panče Naumov ()
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Manas K. Panda: New York University Abu Dhabi
Tomče Runčevski: Max Planck Institute for Solid State Research
Subash Chandra Sahoo: New York University Abu Dhabi
Alexei A. Belik: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)
Naba K. Nath: New York University Abu Dhabi
Robert E. Dinnebier: Max Planck Institute for Solid State Research
Panče Naumov: New York University Abu Dhabi

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The thermosalient effect is an extremely rare propensity of certain crystalline solids for self-actuation by elastic deformation or by a ballistic event. Here we present direct evidence for the driving force behind this impressive crystal motility. Crystals of a prototypical thermosalient material, (phenylazophenyl)palladium hexafluoroacetylacetonate, can switch between five crystal structures (α—ε) that are related by four phase transitions including one thermosalient transition (α↔γ). The mechanical effect is driven by a uniaxial negative expansion that is compensated by unusually large positive axial expansion (260 × 10–6 K–1) with volumetric expansion coefficients (≈250 × 10–6 K–1) that are among the highest values reported in molecular solids thus far. The habit plane advances at ~104 times the rate observed with non-thermosalient transitions. This rapid expansion of the crystal following the phase switching is the driving force for occurrence of the thermosalient effect.

Date: 2014
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DOI: 10.1038/ncomms5811

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