A metastable liquid melted from a crystalline solid under decompression

Lin, Chuanlong; Smith, Jesse S.; Sinogeikin, Stanislav V.; Kono, Yoshio; Park, Changyong; Kenney‐Benson, Curtis; Shen, Guoyin

doi:10.1038/ncomms14260

Cited by 26 publications

(27 citation statements)

References 45 publications

(84 reference statements)

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“…In Figure 2, the progress of two-step decelerated melting observed through 29 Si NMR (c) and IXS experiments (d) is shown for Na zeolite Y. From NMR spectra, the 5 Si-Al configurations are readily identified in the starting crystal and are still evident ( Figure S6, Supporting Information) even when only 25% of Na zeolite Y remains, confirming that crystalline topology is retained in the initial LDA phase (c).…”

Section: Signature Of Meltingmentioning

confidence: 81%

“…Static photoluminescence excitation (PLE) and emission spectra (PL) were recorded on compressed powders of 5 mm in diameter (produced by uniaxial compaction at 1 GPa), using a high-resolution spectrofluorometer (Fluorolog 3, Horiba) with a continuous-wave 450 W Xe lamp as excitation source, and a Hamamatsu R2658P photomultiplier tube (PMT) for detection. 29 Si magic angle spinning NMR measurements ( Figure S6, Supporting Information) were recorded on a Bruker Advance DSX 400 9.4 T spectrometer. Using the excitation line of 7 F 0 → 5 L 6 at the wavelength of 393 nm, the intensity ratio of the emission bands of 5 D 0 → 7 F 2 (≈612 nm) and 5 D 0 → 7 F 1 (≈591 nm) was determined as a measure of local ligand symmetry.…”

Section: Xrd Collapse Measurementsmentioning

confidence: 99%

“…[27] Superheating per se is usually only observed in highly confined geometry or during ultrafast heating. [29] Due to the very high free volume of the precursor phase, structural collapse occurs close to the glass transition temperature of the corresponding liquid, [30,31] which causes deceleration on the scale of minutes. [29] Due to the very high free volume of the precursor phase, structural collapse occurs close to the glass transition temperature of the corresponding liquid, [30,31] which causes deceleration on the scale of minutes.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Decelerated Melting

et al. 2018

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Melting presents one of the most prominent phenomena in condensed matter science. Its microscopic understanding, however, is still fragmented, ranging from simplistic theory to the observation of melting point depressions. Here, a multimethod experimental approach is combined with computational simulation to study the microscopic mechanism of melting between these two extremes. Crystalline structures are exploited in which melting occurs into a metastable liquid close to its glass transition temperature. The associated sluggish dynamics concur with real‐time observation of homogeneous melting. In‐depth information on the structural signature is obtained from various independent spectroscopic and scattering methods, revealing a step‐wise nature of the transition before reaching the liquid state. A kinetic model is derived in which the first reaction step is promoted by local instability events, and the second is driven by diffusive mobility. Computational simulation provides further confirmation for the sequential reaction steps and for the details of the associated structural dynamics. The successful quantitative modeling of the low‐temperature decelerated melting of zeolite crystals, reconciling homogeneous with heterogeneous processes, should serve as a platform for understanding the inherent instability of other zeolitic structures, as well as the prolific and more complex nanoporous metal–organic frameworks.

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Section: Signature Of Meltingmentioning

confidence: 81%

Section: Xrd Collapse Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics of Decelerated Melting

et al. 2018

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“…Recent results have demonstrated that an intermediate liquid phase seems to appear often during the solid–solid phase transition, acting as a precursor to induce the nucleation of the second solid phase in colloidal systems and a bulk metallic glass . The same phenomenon was also observed in a high‐pressure crystalline phase of bismuth (Bi), which can melt into a metastable liquid phase below the melting line during the decompression process . The metastable liquid can be kept for several hours at static conditions and transform into crystalline phases under external perturbations such as heating or cooling.…”

Section: Liquid–liquid Transition In Metallic Liquidsmentioning

confidence: 89%

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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“…It is also of significant importance in alloy design and in the control of single crystal growth. Various crystallization pathways and growth mechanisms of deeply supercooled [1][2][3][4], supersaturated [5,6], and even super-compressed [7][8][9] metastable phases were extensively reported based on various experimental techniques using electrostatic levitation (ESL), electromagnetic levitation (EML), aerodynamic levitation (ADL), and diamond anvil cell (DAC).…”

Section: Introductionmentioning

confidence: 99%

Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %

Jeon

Matson

2017

Crystals

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Abstract:The relationship between emissivity, delay time, and surface growth for metastable solidification of CoSi-62 at. % eutectic alloys is reported from undercooling experiments conducted using electrostatic levitation. A fraction of the undercooled melt is first solidified to CoSi 2 with subsequent nucleation in the mushy-zone of CoSi after an observed delay time. During this double recalescence event, the temperature of the secondary recalescence exceeds the liquidus, indicating that the spectral emissivity has changed. This emissivity change increases with longer delay times during solidification and is linked to the growth of cellular structure on the sample surface. Density measurements showed that the cellular structure begins to grow rapidly at a certain time during metastable solidification. This phenomenon is likely associated with the constitutional undercooling of the remaining melt.

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A metastable liquid melted from a crystalline solid under decompression

Cited by 26 publications

References 45 publications

Kinetics of Decelerated Melting

Kinetics of Decelerated Melting

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

Formation of Cellular Structure on Metastable Solidification of Undercooled Eutectic CoSi-62 at. %

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