Temperature-jump method for characterization of structural fluctuations and irreversible relaxation processes in liquids and glasses

Fujimori, Hiroki; Adachi, Yôko; Oguni, Masaharu

doi:10.1103/physrevb.46.14501

Cited by 41 publications

(27 citation statements)

References 11 publications

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“…The calorimetric ␤ are scattered around the extrapolation of the dielectric curve at T g . The present result is consistent with the previous calorimetric study by Fujimori et al 50 They measured enthalpy relaxation as a function of the amplitude of the enthalpy relaxation (⌬H). In the versus ⌬H and ␤ versus ⌬H plots, they demonstrated that the enthalpy relaxation data give the same and ␤ as those determined by ac calorimetry and dielectric relaxation experiments at the limit of ⌬Hϭ0.…”

Section: E Enthalpy Relaxation Around the Glass Transition Of O-carbsupporting

confidence: 94%

Calorimetric study of plastically crystalline o- and m-carboranes

Yamamuro

Hayashi

Matsuo

et al. 2003

The Journal of Chemical Physics

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Articles you may be interested inCalorimetric and dielectric study of organic ferroelectrics, phenazine-chloranilic acid, and its bromo analog J. Chem. Phys. 130, 034503 (2009); 10.1063/1.3058589 2 H nuclear magnetic resonance study of the molecular motion in cyanoadamantane. I. Supercooled plastically crystalline phase Study of the nature of glass transitions in the plastic crystalline phases of cyclo-octanol, cycloheptanol, cyanoadamantane and cis-1,2-dimethylcyclohexane Structural signature of the configurational entropy change during the glass formation of plastic crystal cyanoadamantaneThe heat capacities of o-and m-carboranes were measured with an adiabatic calorimeter in the temperature range 5-310 K. m-carborane underwent two phase transitions at 170 K and 284 K with transition entropies of 12.70 and 15.52 J K Ϫ1 mol Ϫ1 . The total transition entropy agreed well with the theoretical value, indicating that m-carborane is ordered at 0 K. o-carborane also exhibited two phase transitions at 160 K and 275 K with transition entropies of 3.72 and 13.72 J K Ϫ1 mol Ϫ1 , and additionally a glass transition at 120 K. This glass transition does occur not in the supercooled intermediate-temperature phase but in the low-temperature phase of o-carborane. The high-and intermediate-temperature phases of o-carborane could not be quenched at the maximum cooling rate ͑10 K min Ϫ1 ͒ of this experiment. The total transition entropy of o-carborane was smaller than that of m-carborane by 10.8 J K Ϫ1 mol Ϫ1 , suggesting that o-carborane has residual orientational disorder at 0 K. The enthalpy relaxation was examined by the temperature jump method around the glass transition of o-carborane. The results were reproduced well by the KWW function. The calorimetric relaxation time and nonexponential parameter agreed with dielectric ones at the glass transition temperature. This indicates that the glass transition of o-carborane is due to the freezing of molecular reorientation.

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Section: E Enthalpy Relaxation Around the Glass Transition Of O-carbsupporting

confidence: 94%

Calorimetric study of plastically crystalline o- and m-carboranes

Yamamuro

Hayashi

Matsuo

et al. 2003

The Journal of Chemical Physics

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“…The study here and earlier (32,33,45) however show that b may change, thus confirming a 30-year old finding (90) that b changes with t ann (91).…”

Section: Non-exponential Non-linear Models For Structural Relaxationsupporting

confidence: 89%

Structural Relaxation of Acetaminophen Glass

2006

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“…This also holds for the analyses of aging data using eq. (1) reported in [11,13,35]. Especially, the width parameter β age is found to be much smaller than β obtained from equilibrium experiments.…”

Section: Discussionmentioning

confidence: 73%

Broadband dielectric spectroscopy and aging of glass formers

Wehn

Lunkenheimer

Loidl

2007

Journal of Non-Crystalline Solids

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We present the results of aging experiments on a variety of glass formers, including xylitol, glycerol, propylene carbonate, and [Ca(NO 3 ) 2 ] 0.4 [KNO 3 ] 0.6 (CKN). In addition, broadband dielectric spectra of xylitol and CKN are provided. We demonstrate that, irrespective of which dielectric quantities (dielectric constant, loss and modulus) are analyzed, and irrespective of the spectral region where they have been measured, the aging-time dependence always is governed by the structural rearrangements constituting the α-relaxation. If the time dependence of the structural relaxation time during aging is taken into account, relaxation times and stretching parameters, fully consistent with equilibrium data, are obtained. In CKN, both the structural relaxation time and the strongly decoupled conductivity relaxation time are deduced from the same dielectric aging experiment.

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Temperature-jump method for characterization of structural fluctuations and irreversible relaxation processes in liquids and glasses

Cited by 41 publications

References 11 publications

Calorimetric study of plastically crystalline o- and m-carboranes

Calorimetric study of plastically crystalline o- and m-carboranes

Structural Relaxation of Acetaminophen Glass

Broadband dielectric spectroscopy and aging of glass formers

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