Is the Johari-Goldstein β-relaxation universal?

Thayyil, Mohamed Shahin; Capaccioli, S.; Prevosto, D.; Ngai, K. L.

doi:10.1080/14786430802270082

Cited by 35 publications

(21 citation statements)

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“…Secondary relaxation is usually attributed to the movements in the side groups and is often considered as a precursor of the a relaxation. [9][10][11][12][13][14][15] In bulk metallic glasses, atomic structure should be much simpler, since only nondirectional metallic bonding is involved. However, recent studies indicate that while on the macroscopic scale metallic glasses are isotropic and homogeneous, on the microscopic scale the situation is much more complex.…”

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confidence: 99%

Dynamic mechanical analysis in La-based bulk metallic glasses: Secondary (β) and main (α) relaxations

Qiao

Pelletier

2012

Journal of Applied Physics

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Articles you may be interested inThermal behaviors of liquid La-based bulk metallic glasses J. Appl. Phys. 116, 224903 (2014); 10.1063/1.4903978 Effect of physical aging on Johari-Goldstein relaxation in La-based bulk metallic glass The heterogeneous structure of metallic glasses revealed by superconducting transitions Mechanical relaxation in a Zr-based bulk metallic glass: Analysis based on physical models J. Appl. Phys. 112, 033518 (2012); 10.1063/1.4745019Glass-forming tendency of bulk La-Al-Ni-Cu-(Co) metallic glass-forming liquids

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confidence: 99%

Dynamic mechanical analysis in La-based bulk metallic glasses: Secondary (β) and main (α) relaxations

Qiao

Pelletier

2012

Journal of Applied Physics

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“…It is generally explained in term of hindered intra-and/or inter-molecular motion that remains active even when the whole system is frozen into the glassy state 1 . However, the underlying micromechanisms leading to JG relaxation have not been fully understood [2][3][4][5][6][7][8][9][10][11][12][13] , mainly because of the lack of welldefined experimental characterization on the structural evolution of the disordered glasses. It remains indistinct that the relaxation is essentially involved all atoms/molecules that happens spatially uniformly or originates from local atomic rearrangement associated with structural and chemical heterogeneity 2,3,[11][12][13][14][15][16] .…”

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confidence: 99%

“…J ohari-Goldstein (JG) relaxation has intrinsic correlation with glass transition and many fundamental properties of glassy materials [1][2][3][4][5] . It is generally explained in term of hindered intra-and/or inter-molecular motion that remains active even when the whole system is frozen into the glassy state 1 .…”

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Structural origins of Johari-Goldstein relaxation in a metallic glass

et al. 2014

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Johari-Goldstein or b relaxation, persisting down to glassy state from a supercooled liquid, is a universal phenomenon of glassy dynamics. Nevertheless, the underlying micromechanisms leading to the relaxation are still in debate despite great efforts devoted to this problem for decades. Here we report experimental evidence on the structural origins of Johari-Goldstein relaxation in an ultra-quenched metallic glass. The measured activation energy of the relaxation (B26 times of the product of gas constant and glass transition temperature) is consistent with the dynamic characteristics of Johari-Goldstein relaxation. Synchrotron X-ray investigations demonstrate that the relaxation originates from short-range collective rearrangements of large solvent atoms, which can be realized by local cooperative bonding switch. Our observations provide experimental insights into the atomic mechanisms of Johari-Goldstein relaxation and will be helpful in understanding the low-temperature dynamics and properties of metallic glasses.

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“…52,53,54 The universality of JG β-relaxation in glasses has been discussed and accepted by numerous researchers. 55,56 In polymeric glasses, research has mainly focused on linear polymers. 57,58,59 Very little work has been reported on crosslinked polymeric glasses regarding the mechanism of the JG β-relaxation, factors that affect its thermodynamic properties, or its correlation with the primary relaxation.…”

Section: Secondary Relaxationsmentioning

confidence: 99%

Improving the Distortional Deformation Capabilities of Aerospace Composite Networks

Wiggins¹

2011

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Is the Johari-Goldstein β-relaxation universal?

Cited by 35 publications

References 47 publications

Dynamic mechanical analysis in La-based bulk metallic glasses: Secondary (β) and main (α) relaxations

Dynamic mechanical analysis in La-based bulk metallic glasses: Secondary (β) and main (α) relaxations

Structural origins of Johari-Goldstein relaxation in a metallic glass

Improving the Distortional Deformation Capabilities of Aerospace Composite Networks

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