Electronic Structure Inheritance and Pressure-Induced Polyamorphism in Lanthanide-Based Metallic Glasses

Li, G; Yy, Wang; Liaw, P. K.; Yc, Li; Liu, RP;李延春

doi:10.1103/physrevlett.109.125501

Cited by 85 publications

(34 citation statements)

References 34 publications

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“…They are separated by a transition region between ∼2 GPa and ∼5 GPa, indicating a polyamorphic transition in Ce 68 Al 10 Cu 20 Co 2 MG. This phenomenon is similar to those observed in many other rare-earth-elements-based MGs showing kinks of q 1 under pressure (27,28,34,35).…”

Section: Resultssupporting

confidence: 71%

General 2.5 power law of metallic glasses

Zeng

Lin

Liu

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Metallic glass (MG) is an important new category of materials, but very few rigorous laws are currently known for defining its "disordered" structure. Recently we found that under compression, the volume (V) of an MG changes precisely to the 2.5 power of its principal diffraction peak position (1/q 1 ). In the present study, we find that this 2.5 power law holds even through the first-order polyamorphic transition of a Ce 68 Al 10 Cu 20 Co 2 MG. This transition is, in effect, the equivalent of a continuous "composition" change of 4f-localized "big Ce" to 4f-itinerant "small Ce," indicating the 2.5 power law is general for tuning with composition. The exactness and universality imply that the 2.5 power law may be a general rule defining the structure of MGs.general structure-property relationship | polyamorphic transition | pressure effect | composition effect | atomic packing M etallic glasses (MGs) possess many unique and superior properties, such as extremely high strength, hardness, and corrosion resistance, etc., making them promising metallic materials with widespread applications (1, 2). Thousands of MGs with a wide range of compositions and properties have been synthesized over the past decades. However, so far the development of MGs is mainly based on tedious composition mapping in multicomponent space to pinpoint the combination of elements with optimized glass-forming ability (GFA). This method for development of MGs is a time-and resource-intensive strategy of trial and error which highlights the need for the guidance of a general theory (2, 3). Intensive research effort has been devoted to finding general rules in various MGs to understand the fundamentals and to guide the development of new MGs (4, 5). Quantitative correlations between their properties have been observed. For instance, compressive yield strength and elastic moduli of MGs are found to be intimately connected with their glass transition temperature T g (6-10), and the ductility, fragility (11,12), and Poisson's ratio of MGs are closely related (13-16). The extensive correlations in properties suggest that the disordered MGs may share general rules in their structure. To clarify this scenario, detailed and accurate structural information spanning short range to long range is required. However, the current experimental probes and theories are limited to local structure in MGs (17). Therefore, understanding how the atoms efficiently fill up the 3D space and how this controls the bulk properties of MGs remains a long-standing theoretical challenge (18-23). To date, few general and exact rules regarding structureproperty relationships have been established in MGs (23).Encouraging progress on understanding structure-property relationships in MGs has recently been made through the discoveries of the noncubic (2.3 or 2.5) power laws that correlate the principal diffraction peak (PDP) position q 1 with the bulk density ρ or average atomic volume, V a , i.e., ρ∝(q 1 ) D or V a ∝(1/q 1 ) D , where D equals ∼2.3 with varying the composition of MG...

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Section: Resultssupporting

confidence: 71%

General 2.5 power law of metallic glasses

Zeng

Lin

Liu

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…Later on Zeng et al 9 presented the 4f electron-delocalization evidence under high pressure from the X-ray absorption spectroscopy experiment. The amorphous-toamorphous transformation has been also reported in other rare earth element-based MGs (REMGs), suggesting the electronicstructure inheritance of lanthanide-solvent atoms in REMGs [10][11][12][13][14] . Nevertheless, at present the nature of the electronic localizationdelocalization transition (related to the Kondo volume collapse) is very obscure in these REMGs.…”

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confidence: 67%

Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure

et al. 2015

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The polyamorphsim in amorphous materials is one of the most fascinating topics in condensed matter physics. In amorphous metals, the nature of polyamorphic transformation is poorly understood. Here we investigate the structural evolution of a Ce-based metallic glass (MG) with pressure at room temperature (RT) and near the glass transition temperature by synchrotron X-ray diffraction, uncovering novel behaviours. The MG shows hierarchical densification processes at both temperatures, arising from the hierarchy of interatomic interactions. In contrast with a continuous and smooth process for the low-to medium-density amorphous state transformation at RT, a relatively abrupt and discontinuous transformation around 5.5 GPa is observed at 390 K, suggesting a possible weak first-order nature. Furthermore, both positive and abnormal-negative thermal expansion behaviours on medium-range order are observed in different pressure windows, which could be related to the low-energy vibrational motions and relaxation of the weakly linked solute-centred clusters.

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“…The mechanism here is suggested to be related to delocalization of 4f electrons, which occurs in Ce under high pressure leading to bond shortening and volume collapse [5e7]. However, also for glassy CaeAl [8], Pd- [9], Zr- [10], Gd- [11], and Pr-based [11] bulk metallic glasses, polyamorphic transitions were reported. The occurrence of the phase transition was concluded from observation of kinks in the pressure shifts of the first diffuse X-ray diffraction (XRD) peak or from the deviation of the pressureevolume relations of the well-established fundamental thermodynamic equation of state (EOS) [12].…”

Section: Introductionmentioning

confidence: 91%

Structural behaviour of Pd40Cu30Ni10P20 metallic glass under high pressure

et al. 2013

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a b s t r a c tThe structural behaviour of Pd 40 Cu 30 Ni 10 P 20 bulk metallic glass as a function of hydrostatic pressure up to 47.4 GPa was investigated by means of in situ high energy synchrotron X-ray diffraction patterns. Monotonic changes are observed in the diffraction data without any indication of a phase transition. In real space all maxima of the atomic pair correlation function including the nearest neighbour distance are decreasing and scale with pressure. The volume as function of hydrostatic pressure is extracted from the diffraction data. For the largest hydrostatic pressure of 47.4 GPa the volume is reduced by 18%. The bulk modulus B 0 ¼ 178 GPa was calculated from the diffraction data. The dependence of volume on pressure of Pd 40 Cu 30 Ni 10 P 20 metallic glass can be well described by the BircheMurnaghan equation of state.

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Electronic Structure Inheritance and Pressure-Induced Polyamorphism in Lanthanide-Based Metallic Glasses

Cited by 85 publications

References 34 publications

General 2.5 power law of metallic glasses

General 2.5 power law of metallic glasses

Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure

Structural behaviour of Pd40Cu30Ni10P20 metallic glass under high pressure

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