Lattice dynamics of endotaxial silicide nanowires

Kalt, Jochen; Sternik, M.; Krause, B.; Sergueev, Ilya; Mikolasek, Mirko; Merkel, D. G.; Bessas, Dimitrios; Sikora, Olga; Vitova, T.; Göttlicher, Jörg; Steininger, Ralph; Jochym, Paweł T.; Ptok, Andrzej; Leupold, O.; Wille, Hans‐Christian; Chumakov, A. I.; Piekarz, Przemysław; Parliński, K.; Baumbach, Tilo; Stankov, S.

doi:10.1103/physrevb.102.195414

Cited by 5 publications

(15 citation statements)

References 78 publications

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“…Previous ab initio calculations of the directionprojected Fe-partial PDOS of the tetragonal α-FeSi 2 showed a decoupling of vibrations with xy-and zpolarization [63]. The Fe-partial PDOS of the xypolarized vibrations consists of peaks at 24, 33, and 45 meV, while the z -polarized vibrations are mostly localized at 20 meV with a minor plateau around 40 meV.…”

Section: B Lattice Dynamicsmentioning

confidence: 88%

“…The Fe-partial PDOS of the xypolarized vibrations consists of peaks at 24, 33, and 45 meV, while the z -polarized vibrations are mostly localized at 20 meV with a minor plateau around 40 meV. The experimental PDOS obtained with the wave vector of the x-ray beam being parallel to a certain crystallographic direction of the NWs is composed of a specific combination of xy-and z -polarized phonons [63,73,74]. The relative contributions of xy-, (A xy ) and z -(A z ) polarized phonons can be calculated [67] considering the orientation of the α-FeSi 2 unit cell and amount to A α-FeSi 2 unit cell on the Si(110) surface (see Fig.…”

Section: B Lattice Dynamicsmentioning

confidence: 95%

“…For the growth of α-FeSi 2 on Si(111) [63,68,69] and Si(001) [71,72] the commonly reported epitaxial relation is Si{111}||α-FeSi 2 {112}. In this configuration, the lattice mismatch is minimized if Si 110 ||α-FeSi Figure 4 shows an overview of the AFM images of S1-S6.…”

Section: A Structural Investigationmentioning

confidence: 99%

“…To account for the tensile epitaxial strain between the FeSi 2 crystal and the Si(110) surface, the calculations were done for 0.5 % tensilestrained α-phase FeSi 2 (a = 2.716 Å, c = 5.166 Å). Further details are given elsewhere [63].…”

Section: Sample θF E [Ml]mentioning

confidence: 99%

“…The observed damping of the PDOS features upon reduction of the NW size can be quantified by comparison of the experimental results with the ab initio calculations [63]. The damping originates from phonon scattering at I).…”

Section: B Lattice Dynamicsmentioning

confidence: 99%

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Lattice dynamics of endotaxial silicide nanowires

Kalt,

Sternik,

Krause

et al. 2020

Preprint

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Self-organized silicide nanowires are considered as main building blocks of future nanoelectronics and have been intensively investigated. In nanostructures, the lattice vibrational waves (phonons) deviate drastically from those in bulk crystals, which gives rise to anomalies in thermodynamic, elastic, electronic, and magnetic properties. Hence, a thorough understanding of the physical properties of these materials requires a comprehensive investigation of the lattice dynamics as a function of the nanowire size. We performed a systematic lattice dynamics study of endotaxial FeSi2 nanowires, forming the metastable, surface-stabilized α-phase, which are in-plane embedded into the Si(110) surface. The average widths of the nanowires ranged from 24 to 3 nm, their lengths ranged from several µm to about 100 nm. The Fe-partial phonon density of states, obtained by nuclear inelastic scattering, exhibits a broadening of the spectral features with decreasing nanowire width. The experimental data obtained along and across the nanowires unveiled a pronounced vibrational anisotropy that originates from the specific orientation of the tetragonal α-FeSi2 unit cell on the Si(110) surface. The results from first-principles calculations are fully consistent with the experimental data and allow for a comprehensive understanding of the lattice dynamics of endotaxial silicide nanowires.

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Section: B Lattice Dynamicsmentioning

confidence: 88%

Section: B Lattice Dynamicsmentioning

confidence: 95%

Section: A Structural Investigationmentioning

confidence: 99%

Section: Sample θF E [Ml]mentioning

confidence: 99%

Section: B Lattice Dynamicsmentioning

confidence: 99%

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Lattice dynamics of endotaxial silicide nanowires

Kalt,

Sternik,

Krause

et al. 2020

Preprint

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Lattice dynamics of β−FeSi2 nanorods

et al. 2022

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Here we present a combined experimental and ab initio lattice dynamics study of the semiconducting β phase of FeSi 2 . A polycrystalline β-FeSi 2 film was prepared on Si(111) and single-crystalline, self-assembled β-FeSi 2 nanorods were grown on Si(110) by molecular beam epitaxy. Both types of nanostructures were obtained by annealing of precursor structures, an epitaxial Fe film in the case of the film and high-aspect-ratio α-FeSi 2 nanowires in the case of the nanorods. The morphology and crystalline structure of the samples were investigated by reflection high-energy electron diffraction, atomic force microscopy, as well as x-ray diffraction and x-ray absorption spectroscopy. The Fe-partial phonon density of states (PDOS) was obtained from nuclear inelastic scattering. The PDOS of the film was investigated in the temperature range of 296 K down to 11 K and shows an excellent agreement with the ab initio calculations. In the PDOS of the nanorods, a shift in the number of states in the main features and an additional vibrational mode at 20 meV are observed. While the first effect can fully be explained by the specific orientation of the β-FeSi 2 unit cell on the Si(110) surface, the second effect is attributed to the formation of an α-FeSi 2 interlayer at the β-FeSi 2 /Si interface. Furthermore, the thermoelastic properties of the film show a harmonic behavior in the investigated temperature range. For the nanorods, no significant deviation from the film is observed, except for a small decrease of the sound velocity.

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Iron nanoparticles for plant nutrition: Synthesis, transformation, and utilization by the roots of Cucumis sativus

Gracheva

Klencsár

Kis

et al. 2022

Journal of Materials Research

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Nanotechnology has been evolving in the past decades as an alternative to conventional fertilizers. Ferrihydrite nanoparticles that model the available Fe pool of soils are proposed to be used to recover Fe deficiency of plants. Nevertheless, ferrihydrite aqueous suspensions are known to undergo slow transformation to a mixture of goethite and hematite, which may influence its biological availability. Several nanocolloid suspensions differing in the surfactant type were prepared for plant treatment and fully characterized by transmission electron microscopy and 57Fe Mössbauer spectroscopy supported by magnetic measurements. The rate of transformation and the final mineral composition were revealed for all the applied surfactants. Nanomaterials at different stages of transformations were the subject of plant physiological experiments aiming at comparing the behavior and plant accessibility of the manufactured suspensions of nanoscale iron(III) oxide and oxide–hydroxide particles. Graphical abstract

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Lattice dynamics of endotaxial silicide nanowires

Cited by 5 publications

References 78 publications

Lattice dynamics of endotaxial silicide nanowires

Lattice dynamics of endotaxial silicide nanowires

Lattice dynamics of β−FeSi2 nanorods

Iron nanoparticles for plant nutrition: Synthesis, transformation, and utilization by the roots of Cucumis sativus

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