High-frequency collective excitations in molten and glassy Te studied by inelastic neutron scattering

Ruiz-Martín, M. D.; Jiménez‐Ruiz, Mónica; Bermejo, F. J.; Fernández-Perea, Ricardo

doi:10.1103/physrevb.73.094201

Cited by 12 publications

(12 citation statements)

References 34 publications

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“…Samples obtained by quenching liquid Te in dry ice, ice water, or liquid nitrogen ("glassy" Te) are stable at room temperature, and nuclear magnetic resonance 20 and inelastic neutron scattering data have been measured. 21 A Monte Carlo energy optimization with a classical force field has also been performed. 22 Tellurium is the main component of many phase change materials, such as Ge 2 Sb 2 Te 5 , where the rapid and reversible change between amorphous (a) and crystalline (c) states is essential for technological applications.…”

Section: 2mentioning

confidence: 99%

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

Akola

Jones

2012

Phys. Rev. B

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Density functional/molecular dynamics simulations have been performed on amorphous tellurium (a meltquenched sample of 343 atoms at 300 K) and on Te clusters with up to 16 atoms. The former extend our calculations on liquid Te at 560, 625, 722, and 970 K [Phys. Rev. B 81, 094202 (2010)]. We discuss trends in structures (including those of other group-16 elements), electronic densities of states, and vibration frequencies. Chain structures are common in S and Se, but the chains in amorphous Te are short, and branching sites with threefold-coordinated atoms are common. The energy difference between two-and threefold local coordination depends sensitively on the exchange-correlation functional used. Cavities are characteristic of amorphous Te (37% of total volume), but are absent in crystalline (trigonal) Te.

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Section: 2mentioning

confidence: 99%

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

Akola

Jones

2012

Phys. Rev. B

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“…3 shows an example of such measurements: a set of spectra of liquid Te at two different temperatures, 773 K and 1023 K, measured on the thermal TAS IN8 [12]. This study was performed in order to explore whether the macroscopic finding in the anomalous behaviour of the sound velocity also has a microscopic correlate [13]. The measurements were carried out at constant k f = 4.1 Å À1 that allowed to access the excitations and with a tight collimation in order to improve the energy resolution (DE = 0.9 meV).…”

Section: Triple Axes Spectrometersmentioning

confidence: 99%

Structure and dynamics of non-crystalline materials at the Institut Laue Langevin

Cuello

Jiménez‐Ruiz

González

2007

Journal of Non-Crystalline Solids

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“…Elemental Te cannot be obtained in the bulk glassy state even if high quenching rates are applied [5,6,99]. There are, surprisingly, a few reports on rapid solidification of the melt towards the formation of the bulk glass [100,101]. The results of these reports are highly questionable since the polycrystalline form is most probably formed by melt quenching, instead of the glass.…”

Section: Amorphous Telluriummentioning

confidence: 99%

Structure and photo-induced effects in elemental chalcogens: a review on Raman scattering

Yannopoulos

2020

J Mater Sci: Mater Electron

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Much progress has been made over a long period, spanning more than a century, in understanding the atomic arrangement on various length scales of non-crystalline chalcogens and their transitions upon certain external stimuli. However, it is broadly admitted that there are still several unsettled issues that call for proper rationalization. The current review presents an assessment of Raman scattering studies of non-crystalline phases of elemental chalcogens and their mixtures. First, a few remarks on the analysis of Raman data, related to polarization details and spectra reduction are presented. The effect of temperature, pressure and irradiation on the structure of chalcogens is reviewed in detail. As only selenium can form a stable glass at ambient conditions, the interest on sulfur and tellurium has been placed in the melt and the amorphous phase, respectively, whereas reference is also made to the sporadic structural studies of glassy sulfur at low temperatures. It is shown how Raman scattering can be exploited to explore unique phenomena emerging in the liquid state of sulfur, offering valuable information on the details of λ−transition including various thermodynamic-related properties. The subtle nature of this transition in selenium is also discussed. Tellurium is not only impossible to be prepared in the bulk glassy state, but also forms a very liable to crystallization amorphous film. Therefore, the emphasis is placed on light-induced nanostructuring and effects related to photo-amorphization and photo-oxidation. 2 IntroductionNon-crystalline chalcogenides, either as bulk glasses or amorphous films, have attracted extensive interest since their discovery, not only from the viewpoint of fundamental science but in addition owing to the technological potential that these materials exhibit over diverse sectors of active and passive applications [1,2]. Structure on the atomic scale is the decisive factor that determines macroscopic properties and ultimately function of the material. In addition, photoinduced effects, a hallmark of non-crystalline chalcogenides, depend on composition since structural arrangement must be suitable to allow photoinduced transformations on various length scales [3,4]. Understanding structure will not only allow identifying why a material behaves macroscopically in a certain manner, but will make feasible to establish structure-property relations. The latter are central to progress from serendipitous discoveries of functional materials to a rational design of materials with tailored properties. Disorder abolishes all the amenities accompanying the crystal periodicity, which render the role of structure-property relationships indispensable to disordered media.Resolving structure in the amorphous state is per se a formidable task. This is true even for simple systems, e.g. monoatomic chalcogens, let alone for multicomponent materials. Research for applications in non-crystalline chalcogenides has since the beginning of their discovery moved to studies of multicomponent systems, i.e....

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High-frequency collective excitations in molten and glassy Te studied by inelastic neutron scattering

Cited by 12 publications

References 34 publications

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

Structure and dynamics of non-crystalline materials at the Institut Laue Langevin

Structure and photo-induced effects in elemental chalcogens: a review on Raman scattering

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