Electronic properties and atomic structure of (Ti, Zr, Hf)(Ni, Cu) metallic glasses

Bakonyi, I.

doi:10.1016/0022-3093(94)00472-2

Cited by 44 publications

(91 citation statements)

References 103 publications

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“…Hartree screening yields the highest values of λ, whereas the values obtained from the GV screening are the lowest. The graph obtained for the RPA form of dielectric screening is in good agreement with the results of Bakonyi [41]. The magnitude of λ indicates that the Cu -Zr system is a weak-to intermediate-coupling superconductor.…”

Section: Resultssupporting

confidence: 83%

“…1. The graphs have the same form as suggested by Bakonyi [41]. The graphs as well as Table 3 show that λ values are quite sensitive to the form of dielectric screening.…”

Section: Resultsmentioning

confidence: 80%

“…The study of the concentration (x) dependence of T c and other superconducting state parameters of Cu x Zr 100-x may be of interest in the sense that a linear variation of T c with x as observed by Bakonyi [41] may lead us to predict a linear T c equation for the binary system of Cu -Zr metallic glasses, which may be useful for predicting T c values for glasses of this system with different compositions.…”

Section: Introductionmentioning

confidence: 98%

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Screening dependence of superconducting state parameters of Cu–Zr metallic glasses

Sharma¹,

Khan²,

Sharma

2004

Physica Status Solidi (b)

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The screening dependence of superconducting state parameters (λ, µ*, T c , α and N 0 V) of nine metallic glasses of the Cu-Zr system has been studied in the BCS-Eliashberg-McMillan framework by employing five forms of dielectric screening function in conjunction with Ashcroft's potential. It is observed that the electron-phonon coupling strength (λ) and transition temperature (T c ) are quite sensitive to the form of the dielectric screening, whereas the Coulomb pseudopotential (µ*), isotope effect exponent (α ) and effective interaction strength (N 0 V) show weak dependences on screening function. The RPA form of dielectric screening is observed to yield the best results for all the glasses of the Cu-Zr system studied in the present work. Present computations yield almost linear variation of T c with concentration x of Cu in the Cu-Zr system, which is in agreement with the experimental data. A linear T c equation is proposed by fitting the present results for RPA screening, which is in conformity with other results for the experimental data.

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Section: Resultssupporting

confidence: 83%

“…1. The graphs have the same form as suggested by Bakonyi [41]. The graphs as well as Table 3 show that λ values are quite sensitive to the form of dielectric screening.…”

Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 98%

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Screening dependence of superconducting state parameters of Cu–Zr metallic glasses

Sharma¹,

Khan²,

Sharma

2004

Physica Status Solidi (b)

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“…Finally, the electrons could scatter from spin fluctuations which gain influence toward lower temperature in a paramagnetic solid. However, for Ni concentration below 70 % the paramagnetism is very weak 10 as corroborated by our own magnetization measurements for the sample used here. Moreover, Batalla et al…”

Section: Resultssupporting

confidence: 59%

“…The amorphous character is also reflected in the slight (1%) increase of the resistivity ρ(T ) upon cooling from room temperature to 4 K, which is just opposite what is observed in microcrystalline samples 9 . A mean free path of approximately 20Å or some 5 − −10 interatomic distances a is estimated from the resistivity, ρ = 150 µΩ cm, and the density of states at the Fermi level N (E F ) 10 . The Raman experiments were performed with standard equipment.…”

Section: Samples and Experimentsmentioning

confidence: 99%

Light scattering study of low-energy vibrational excitations in the metallic glass Ni67Zr33using electronic Raman scattering

et al. 2011

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The Raman response of the metallic glass Ni67Zr33 is measured as a function of polarization and temperature and analyzed theoretically. Unexpectedly, the intensity in the range up to 300 cm −1 increases upon cooling, which is counterintuitive when the response originates from vibrations alone as in insulators. The increase finds a natural explanation if the conduction electrons are assumed to scatter on localized vibrations with a scattering probability proportional to the Debye-Waller factor. None of our assumptions is material specific, and the results are expected to be relevant for disordered systems in general.

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Structure, Crystallization and Electrochemical Corrosion Behaviour of Amorphous Cu66Ti34 Alloy

Zaprianova

Raicheff

Gattef

1998

Cryst. Res. Technol.

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The effect of thermally induced structural changes on electrochemical corrosion behaviour of amorphous Cu66Ti34 alloy is studied using electrochemical potentiodynamic polarization technique in conjunction with XRD, TEM and DTA. The heat treatment has been carried out at two temperatures: 300 °C — where the process of structural relaxation is only possible and 500 °C — where crystallization of the alloy occurs. As model corrosive media 1N H2SO4 and 1N HNO3 solutions are used. The short range order of the amorphous samples is studied with the total pair correlation function. Some changes of the interatomic distances and a tendency to increasing of the density of the amorphous structure after low temperature heating are established. The crystallization leads to formation of Cu3Ti2, β‐Cu3Ti and Cu2Ti crystalline phases. It has been found that structural relaxation may have a beneficial effect on the susceptibility of the amorphous alloy to passivation, while crystallization lowers considerably its corrosion resistance.

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Electronic properties and atomic structure of (Ti, Zr, Hf)(Ni, Cu) metallic glasses

Cited by 44 publications

References 103 publications

Screening dependence of superconducting state parameters of Cu–Zr metallic glasses

Screening dependence of superconducting state parameters of Cu–Zr metallic glasses

Light scattering study of low-energy vibrational excitations in the metallic glass Ni67Zr33using electronic Raman scattering

Structure, Crystallization and Electrochemical Corrosion Behaviour of Amorphous Cu66Ti34 Alloy

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