Probing the structure of a liquid metal during vitrification

Georgarakis, K.; Hennet, Louis; Evangelakis, G.A.; Antonowicz, Jerzy; Bokas, G.B.; Honkimäki, V.; Bytchkov, Aleksei; Chen, Luyang; Yavari, A.R.

doi:10.1016/j.actamat.2015.01.005

Cited by 39 publications

(21 citation statements)

References 79 publications

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“…When cooled below the melting temperature, a remarkable slowdown of the thermal dynamics in the supercooled liquid mostly can be observed. Structural evolutions of metallic glass-forming liquids during vitrification are consistent with the transformation from stable liquid to metastable liquid[78,87]. During cooling below the equilibrium liquidus temperature, metallic liquids usually exhibit a rapid rise in viscosity and non-Arrhenius temperature dependence of viscosity characterized by the fragility of liquid, correlated to the anomalies in the evolution of the atomic structure in the supercooled liquid region[75,76].…”

mentioning

confidence: 55%

“…A shoulder is visible on the first peak at low temperatures and still well-pronounced at higher temperatures [53,54]. Considering the asymmetry of the first peak in S(q), two individual peak profiles are applied to fit the first main peak and its shoulder, which was also reported in literature [75][76][77][78]. Fitting results at two 6 selected temperatures are presented in Fig.…”

Section: Structural Factor and Pair-distribution Functionmentioning

confidence: 66%

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Temperature-dependent structure evolution in liquid gallium

Xiong

Wang

et al. 2017

Acta Materialia

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Temperature-dependent atomistic structure evolution of liquid gallium (Ga) has been investigated by using in situ high energy X-ray diffraction experiment and ab initio molecular dynamics simulation. Both experimental and theoretical results reveal the existence of a liquid structural change around 1000 K in liquid Ga. Below and above this temperature the liquid exhibits differences in activation energy for self-diffusion, temperature-dependent heat capacity, coordination numbers, density, viscosity, electric resistivity and thermoelectric power, which are reflected from structural changes of the bond-orientational order parameter Q 6 , fraction of covalent dimers, averaged string length and local atomic packing. This finding will trigger more studies on the liquid-to-liquid crossover in metallic melts.

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mentioning

confidence: 55%

Section: Structural Factor and Pair-distribution Functionmentioning

confidence: 66%

Temperature-dependent structure evolution in liquid gallium

Xiong

Wang

et al. 2017

Acta Materialia

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“…For comparison we note that Georgarakis et al [53] measured temperature-dependent S(Q 1 ) in the entire supercooled region of Zr 60 Cu 30 Al 10 with clear SRO and MRO evolution on cooling ( ≈ −100 K s −1 ). Two structural fragility regimes, a fragile and a strong end, could be distinguished between the high-(above T m ) and the low-temperature (at large T ) liquid, respectively.…”

Section: Temperature Evolution Of the X-ray Structure Factormentioning

confidence: 89%

Correlating ultrafast calorimetry, viscosity, and structural measurements in liquid GeTe and Ge15Te85

Weber

Orava

Kaban

et al. 2018

Phys. Rev. Materials

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Two distinct trends in the temperature dependence of viscosity, measured directly and inferred from calorimetry by analyzing crystallization kinetics, can be correlated with the temperature evolution of the height of the first peak of the x-ray total structure factor for liquid GeTe and Ge 15 Te 85 . The phase-change chalcogenide GeTe is a high-fragility liquid with the kinetic fragility value of 76, at the glass-transition temperature, being between those for liquid (Ag,In)-doped Sb 2 Te and Ge 2 Sb 2 Te 5 . The viscosity of the high-temperature liquid shows Arrhenius kinetics on cooling to the melting point, and the structure factor conforms to the fragile liquid. For liquid Ge 15 Te 85 , the temperature evolution of the structure factor suggests a transition in the temperature range of about 100 K above the melting. The crystallization shows a wide range of Arrhenius kinetics in the supercooled liquid region. This finding combined with the dynamic viscosity measurements is interpreted by invoking a weak fragile-to-strong crossover on cooling the liquid Ge 15 Te 85 . The differences in structures and dynamics of liquid GeTe and Ge 15 Te 85 appear closely correlated to their distinctly different crystallization mechanisms.

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“…Recent reports have shown that the upgraded aerodynamic levitation is available to be combined with synchrotron radiation and neutron sources for studying the structure and dynamics of metallic liquids . By using this equipment, Georgarkais et al could experimentally trace the atomic rearrangements in a Cu–Zr–Al metallic liquids during in situ vitrification . Such experiments will be extended to other alloy systems that are difficult to levitate by ESL.…”

Section: Methods To Study the Structure Of Metallic Liquidsmentioning

confidence: 99%

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

Wang

Jiang

2017

Advanced Materials

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The relationship between the structural evolution and properties of metallic liquids is a long-standing hot issue in condensed-matter physics and materials science. Here, recent progress is reviewed in several fundamental aspects of metallic liquids, including the methods to study their atomic structures, liquid-liquid transition, physical properties, fragility, and their correlations with local structures, together with potential applications of liquid metals at room temperature. Involved with more experimentally and theoretically advanced techniques, these studies provide more in-depth understanding of the structure-property relationship of metallic liquids and promote the design of new metallic materials with superior properties.

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Probing the structure of a liquid metal during vitrification

Cited by 39 publications

References 79 publications

Temperature-dependent structure evolution in liquid gallium

Temperature-dependent structure evolution in liquid gallium

Correlating ultrafast calorimetry, viscosity, and structural measurements in liquid GeTe and Ge15Te85

Perspective on Structural Evolution and Relations with Thermophysical Properties of Metallic Liquids

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