High-pressure differential thermal analysis study of the phase
behaviour in sometert-butyl compounds: pivalic acid,
2-methylpropane-2-thiol and tert-butylamine

Reuter, J.; Büsing, D.; Tamarit, J. Ll.; Würflinger, A.

doi:10.1039/a604182e

Cited by 28 publications

(41 citation statements)

References 1 publication

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“…A deviation from this behavior was observed, however, in a 54 compound that differed from the rest in the nature of the intermolecular bonds [10].…”

mentioning

confidence: 93%

Melting of orientational degrees of freedom

Aznar

Lloveras

Tamarit

2017

Eur. Phys. J. Spec. Top.

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“…A deviation from this behavior was observed, however, in a 54 compound that differed from the rest in the nature of the intermolecular bonds [10].…”

mentioning

confidence: 93%

Melting of orientational degrees of freedom

Aznar

Lloveras

Tamarit

2017

Eur. Phys. J. Spec. Top.

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“…Orientationally disordered organic crystals store large amount of thermal energy during solid state phase transitions, unlike other phase change materials that store energy during solid to liquid phase transitions [1,2]. The entropy of solid-solid phase transitions is much larger than of solid-liquid, and follows the Timmermans law [3].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic modeling of binary phase diagram of 2-amino-2-methyl-1, 3-propanediol and TRIS(hydroxymethyl)aminomethane system with experimental verification

Mekala

Kamisetty

Chien

et al. 2015

Calphad

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“…Orientationally disordered (OD) phases are generally formed by relatively small globular molecules such as derivatives of methane, 1,2,3 neopentane, 4 adamantane 5 or fullerene, 6 or by small linear ones such as ethane derivatives 7,8,9 and dinitriles. 10 OD solids exhibit many of the phenomenological features of glass formers, displaying in particular a cooperative rotational motion, called α relaxation, that undergoes a continuous, dramatic slow-down upon cooling, 11,12 leading in some cases to a glass-like transition associated with rotational freezing.…”

Section: Introductionmentioning

confidence: 99%

Orientational relaxations in solid (1,1,2,2)tetrachloroethane

Tripathi

Mitsari

Romanini

et al. 2016

The Journal of Chemical Physics

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We employ dielectric spectroscopy and molecular dynamic simulations to investigate the dipolar dynamics in the orientationally disordered solid phase of (1,1,2,2)tetrachloroethane. Three distinct orientational dynamics are observed as separate dielectric loss features, all characterized by a simply activated temperature dependence. The slower process, associated to a glassy transition at 156±1 K, corresponds to a cooperative motion by which each molecule rotates by 180º around the molecular symmetry axis through an intermediate state in which the symmetry axis is oriented roughly orthogonally to the initial and final states. Of the other two dipolar relaxations, the intermediate one is the Johari-Goldstein precursor relaxation of the cooperative dynamics, while the fastest process corresponds to an orientational fluctuation of single molecules into a higher-energy orientation. The Kirkwood correlation factor of the cooperative relaxation is of the order of one tenth, indicating that the molecular dipoles maintain on average a strong antiparallel alignment during their collective motion. These findings show that the combination of dielectric spectroscopy and molecular simulations allows studying in great detail the orientational dynamics in molecular solids. 2 INTRODUCTIONWhile conventional (atomic) solids are made of atomic constituents with only translational degrees of freedom, so that their structure is totally determined by translation symmetry and fundamental excitations are vibrational in character, in molecular solids the constituent molecules possess also orientational (as well as internal) degrees of freedom, which lead to a richer variety of possible solid phases and to the existence of rotational excitations such as librations and orientational relaxations. A molecular solid can display complete translational and rotational order, as in a molecular crystal, or complete rototranslational disorder, as in a molecular glass. In between these two extremes, molecular solids also display phases (known as Orientationally disordered (OD) phases are generally formed by relatively small globular molecules such as derivatives of methane, 1,2,3 neopentane, 4 adamantane 5 or fullerene, 6 or by small linear ones such as ethane derivatives 7,8,9 and dinitriles. 10 OD solids exhibit many of the phenomenological features of glass formers, displaying in particular a cooperative rotational motion, called α relaxation, that undergoes a continuous, dramatic slow-down upon cooling, 11,12 leading in some cases to a glass-like 3 transition associated with rotational freezing. 13,14 Contrary to structural glasses, which do not exhibit any long-range order, OD phases are characterized by a translationally ordered structure and can therefore be more thoroughly characterized with the help of methods that exploit the translational symmetry such as Bragg diffraction, lattice models, or solid-state NMR spectroscopy. Even more importantly, since as mentioned OD phases are generally formed by molecular species with a simple structure ...

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High-pressure differential thermal analysis study of the phase behaviour in sometert-butyl compounds: pivalic acid, 2-methylpropane-2-thiol and tert-butylamine

Cited by 28 publications

References 1 publication

Melting of orientational degrees of freedom

Melting of orientational degrees of freedom

Thermodynamic modeling of binary phase diagram of 2-amino-2-methyl-1, 3-propanediol and TRIS(hydroxymethyl)aminomethane system with experimental verification

Orientational relaxations in solid (1,1,2,2)tetrachloroethane

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