Temperature-dependent structural changes in liquid Ge15Te85

Kaban, I.; Hoyer, W.; Il’inskii, A.; Shpak, A. P.; Jóvári, P.

doi:10.1016/j.jnoncrysol.2007.01.048

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…Pre-peaks, indicating some degree of medium-range order (MRO), have been observed previously in experimental [15][16][17][18][19] and theoretical 18,20,21 studies of metallic glasses and liquids. However, reports of MRO in metal-metal liquids are rare, 22,23 found primarily in metal-metalloid binary 24,25 and Al-based binary and ternary 17,26,27 alloys. In this letter, we present the results from in-situ high-energy synchrotron X-ray diffraction studies of equilibrium and supercooled Zr 80 Pt 20 liquids (eutectic composition) using the Beamline Electrostatic Levitation (BESL) 28 technique.…”

Section: Introductionmentioning

confidence: 99%

Short- and medium-range order in Zr80Pt20liquids

Mauro¹,

Wessels

Bendert³

et al. 2011

Phys. Rev. B

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The atomic structures in equilibrium and supercooled liquids of Zr 80 Pt 20 were determined as a function of temperature by in-situ high-energy synchrotron diffraction studies of the levitated liquids (containerless processing) using the beamline electrostatic levitation (BESL) technique. The presence of a pronounced pre-peak at q ~ 1.7 Å -1 in the static structure factor indicates medium range order (MRO) in the liquid. The position and intensity of the pre-peak remain constant with cooling, indicating that the MRO is already present in the liquid above its melting temperature. An analysis of the liquid atomic structures obtained using the Reverse Monte Carlo (RMC) method utilizing both the structure factor, S(q), from x-ray diffraction experiments and the partial pair-correlation functions from ab initio molecular dynamics (MD) simulations show that the pre-peak arises from a Pt-Pt correlation that can be indentified with icosahedral short-range order around the Pt atoms. The local atomic ordering is dominated by icosahedral-like structures, raising the nucleation barrier between the liquid and these phases, thus assisting glass formation.

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Section: Introductionmentioning

confidence: 99%

Short- and medium-range order in Zr80Pt20liquids

Mauro¹,

Wessels

Bendert³

et al. 2011

Phys. Rev. B

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“…Different techniques have been used to study the structural [5][6][7][8], electrical [9,10] and optical [11][12][13] properties of amorphous Ge-Te glasses. While, the crystallization kinetics of amorphous Ge-Te glasses were studied using the differential scanning calorimetry, DSC, technique under non-isothermal conditions by many authors [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Determination of the crystallization kinetic parameters of Ge22.5Te77.5 glass using model-free and model-fitting methods

El-Oyoun

2009

Journal of Alloys and Compounds

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“…[24][25][26][27][28][29] Alloy clusters can have structures and properties that are different from their pure counterparts and there has been a lot of interest in their melting behavior as well. [30][31][32][33][34][35][36][37][38][39][40][41][42][43] However, almost all previous work on the melting of alloy clusters has been computational. There have been many interesting predictions.…”

Section: Introductionmentioning

confidence: 99%

Substituting a copper atom modifies the melting of aluminum clusters

Cao

Starace

Neal

et al. 2008

The Journal of Chemical Physics

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Heat capacities have been measured for Al n−1 Cu − clusters ͑n =49-62͒ and compared with results for pure Al n + clusters. Al n−1 Cu − and Al n + have the same number of atoms and the same number of valence electrons ͑excluding the copper d electrons͒. Both clusters show peaks in their heat capacities that can be attributed to melting transitions; however, substitution of an aluminum atom by a copper atom causes significant changes in the melting behavior. The sharp drop in the melting temperature that occurs between n = 55 and 56 for pure aluminum clusters does not occur for the Al n−1 Cu − analogs. First-principles density-functional theory has been used to locate the global minimum energy structures of the doped clusters. The results show that the copper atom substitutes for an interior aluminum atom, preferably one with a local face-centered-cubic environment. Substitution does not substantially change the electronic or geometric structures of the host cluster unless there are several Al n + isomers close to the ground state. The main structural effect is a contraction of the bond lengths around the copper impurity, which induces both a contraction of the whole cluster and a stress redistribution between the Al-Al bonds. The size dependence of the substitution energy is correlated with the change in the latent heat of melting on substitution.

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Temperature-dependent structural changes in liquid Ge15Te85

Cited by 13 publications

References 13 publications

Short- and medium-range order in Zr80Pt20liquids

Short- and medium-range order in Zr80Pt20liquids

Determination of the crystallization kinetic parameters of Ge22.5Te77.5 glass using model-free and model-fitting methods

Substituting a copper atom modifies the melting of aluminum clusters

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