Isomorphous phase transition of 1,2,4,5-tetrabromobenzene jumping crystals studied by Brillouin light scattering

Ko, Jae Hyeon; Lee, Kwang Sei; Sahoo, Subash Chandra; Naumov, Panče

doi:10.1016/j.ssc.2013.08.021

Cited by 13 publications

(14 citation statements)

References 19 publications

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“…This compound undergoes a first-order phase transition from the β-to γ-phase on heating, which is accompanied by crystal jumping and/or cracking [3][4][5][6][7][8] . The crystal structures before and after the phase transition were studied by single-crystal and powder X-ray diffraction 5,9,10 and spectroscopic techniques [11][12][13] , and the acoustic emission across the phase transition was also measured 14 . The thermosalient effect was followed by kinematic analysis 7,8 .…”

Section: Introductionmentioning

confidence: 99%

“…While previous work has reported variable-temperature powder X-ray diffraction data, 5 it was not sufficient to provide this detailed information. An alternative model was proposed by 13 based on Brillouin light scattering spectroscopy. The lowest transverse acoustic mode exhibited a substantial softening on approaching the phase transition on heating.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic lattice softening near the structural phase transition in the thermosalient crystal 1,2,4,5-tetrabromobenzene

Zakharov

Michalchuk

Morrison

et al. 2018

Phys. Chem. Chem. Phys.

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The thermosalient effect (crystal jumping on heating) attracts much attention as both an intriguing academic phenomenon and in relation to its potential for the development of molecular actuators but its mechanism remains unclear. 1,2,4,5-Tetrabromobenzene (TBB) is one of the most extensively studied thermosalient compounds that has been shown previously to undergo a phase transition on heating, accompanied by crystal jumping and cracking. The difference in the crystal structures and intermolecular interaction energies of the low- and high-temperature phases is, however, too small to account for the large stress that arises over the course of the transformation. The energy is released spontaneously, and crystals jump across distances that exceed the crystal size by orders of magnitude. In the present work, the anisotropy of lattice strain is followed across the phase transition by single-crystal X-ray diffraction, focusing on the structural evolution from 273 to 343 K. A pronounced lattice softening is observed close to the transition point, with the structure becoming more rigid immediately after the phase transition. The diffraction studies are further supported by theoretical analysis of pairwise intermolecular energies and zone-centre lattice vibrations. Only three modes are found to monotonically soften up to the phase transition, with complex behaviour exhibited by the remaining lattice modes. The thermosalient effect is delayed with respect to the structural transformation itself. This can originate from the martensitic mechanism of the transformation, and the accumulation of stress associated with vibrational switching across the phase transition. The finding of this study sheds more light on the nature of the thermosalient effect in 1,2,4,5-tetrabromobenzene and can be applicable also to other thermosalient compounds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropic lattice softening near the structural phase transition in the thermosalient crystal 1,2,4,5-tetrabromobenzene

Zakharov

Michalchuk

Morrison

et al. 2018

Phys. Chem. Chem. Phys.

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“…[45] Brillouin light scattering studies have shown that it is driven by elastic instability, and the underlying molecular displacements are associated with large intermolecular anharmonic interactions. [46] One of the compounds of interest, PHA (Figure 2A), can exist as five polymorphs that can be thermally converted into each other by four consecutive phase transitions (Figure 1). When heated from ambient temperature, its form α PHA is first transformed to form γ PHA (342-354 K) and then to form β PHA (369 K).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultrafast, Light, Soft Martensitic Materials

Ahmed¹,

Karothu²,

Slimani

et al. 2022

Adv Funct Materials

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Martensitic transformations are well documented in metals and alloys where the atoms connected via metallic bonds rearrange concertedly and rapidly; however, due to the metal atoms, these materials are inherently very dense and add significant weight and bulkiness to actuating devices. Here, remarkably rapid lattice switching of molecular martensitic materials is reported where the rate of structural transformation exceeds other phase transitions several orders of magnitude. With a determined speed in the range of 0.3-0.6 m s −1 , the new phase advances throughout the crystal about ten thousand times faster relative to spin-crossover transitions, and about hundred to hundred thousand times faster than other common structural phase transitions. Macroscopic crystals of these materials respond by rapid expansion or contraction of about 0.02 m s −1 for unrestrained crystals and 0.02-0.03 m s −1 for clamped crystals. Monte-Carlo simulation of the spatiotemporal profile of the transition and of the local distribution of elastic and kinetic energies induced by domain growth reveals the critical role of the dynamic phase boundary and the lattice edges in the structure switching. Within a broader context, this study indicates that the martensitic organic crystals are prospective lightweight substitutes of metals for ultrafast and clean energy transduction.

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“…Figure 2b shows one example of the curve-fitting result for the spectrum measured at 30 °C. Splitting of the LA mode has been observed from several birefringent single crystals, such as aspirin and 1,2,4,5-tetrabromobenzene single crystals [26,35]. Thus, the most probable origin of the splitting of the LA mode is the birefringence of the taurine single crystal, which the incident polarization feels.…”

Section: Resultsmentioning

confidence: 99%

Elastic Properties of Taurine Single Crystals Studied by Brillouin Spectroscopy

Kang

et al. 2021

IJMS

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The inelastic interaction between the incident photons and acoustic phonons in the taurine single crystal was investigated by using Brillouin spectroscopy. Three acoustic phonons propagating along the crystallographic b-axis were investigated over a temperature range of −185 to 175 °C. The temperature dependences of the sound velocity, the acoustic absorption coefficient, and the elastic constants were determined for the first time. The elastic behaviors could be explained based on normal lattice anharmonicity. No evidence for the structural phase transition was observed, consistent with previous structural studies. The birefringence in the ac-plane indirectly estimated from the split longitudinal acoustic modes was consistent with one theoretical calculation by using the extrapolation of the measured dielectric functions in the infrared range.

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Isomorphous phase transition of 1,2,4,5-tetrabromobenzene jumping crystals studied by Brillouin light scattering

Cited by 13 publications

References 19 publications

Anisotropic lattice softening near the structural phase transition in the thermosalient crystal 1,2,4,5-tetrabromobenzene

Anisotropic lattice softening near the structural phase transition in the thermosalient crystal 1,2,4,5-tetrabromobenzene

Ultrafast, Light, Soft Martensitic Materials

Elastic Properties of Taurine Single Crystals Studied by Brillouin Spectroscopy

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