Thermoelectric power of Ni-Zr metal glasses

Altounian, Z.; Foiles, C. L.; Muir, W. B.; Ström‐Olsen, J. O.

doi:10.1103/physrevb.27.1955

Cited by 59 publications

(19 citation statements)

References 14 publications

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“…To explain this behavior, an extended Ziman model ͑Faber-Ziman͒ has been effectively introduced to take account of the different way in which the various constituents contribute to the measured thermopower. 20,21 In the case of NBMG alloys, the larger phonon wavelength and rapidly dropping number of phonons lead to very ineffective electron-phonon scattering at low temperatures, 19 and hence phonon drag contribution becomes insignificant. Nevertheless, the appearance of a "knee" around 50 K in temperature-dependent thermopower has been reported in many of the NBMG alloys, 19,20 which has been also correlated to the electron-phonon mass enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…20,21 In the case of NBMG alloys, the larger phonon wavelength and rapidly dropping number of phonons lead to very ineffective electron-phonon scattering at low temperatures, 19 and hence phonon drag contribution becomes insignificant. Nevertheless, the appearance of a "knee" around 50 K in temperature-dependent thermopower has been reported in many of the NBMG alloys, 19,20 which has been also correlated to the electron-phonon mass enhancement. The reported electron-phonon mass enhancement was found to decrease as the temperature increases and completely disappears at temperatures comparable with the Debye temperature.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of low-temperature transport properties of Cu-based Cu-Zr-Ti bulk metallic glass

Kuo

Sivakumar

et al. 2006

Phys. Rev. B

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The transport properties, including electrical resistivity ͑͒, thermopower ͑S͒, and thermal conductivity ͑͒ of bulk metallic glass alloys Cu 64 Zr 28.5 Ti 7.1 , Cu 62.3 Zr 23.7 Ti 10 , Cu 60.6 Zr 26.9 Ti 12.5 and Cu 58.8 Zr 26.2 Ti 15 in the temperature range 10-300 K are reported. The temperature variations of electrical resistivity in these alloys, with a negative temperature coefficient, are found to be rather weak. These findings are consistent with the metallic glass nature of these compounds. It is observed that the electrical resistivity increases with increasing Ti concentration, ascribed to the enhancement of disorder with such a composition change. The magnetoresistivity of Cu 64 Zr 28.5 Ti 7.5 alloy decreases with increasing temperature and increases with increasing magnetic field, suggesting that the weak localization effect dominates the electrical transport. The temperature-dependent thermopower and thermal conductivity characteristics are nearly identical and weakly independent of compositions. It is noted that the observed ͑T͒ of Cu-Zr-Ti metallic glass alloys show notable similarities with the quasicrystalline system. There are two main features in S͑T͒, a knee around 120 K and a plateau below 50 K, which represent the deviation from the expected linear behavior. A detailed theoretical analysis has suggested that the appearance of the knee is due to the electron-phonon interaction at low temperatures and the plateau is associated with low-energy excitations in glasses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of low-temperature transport properties of Cu-based Cu-Zr-Ti bulk metallic glass

Kuo

Sivakumar

et al. 2006

Phys. Rev. B

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“…It is evident from fig. 1 that the explanation put forward on the basis of the Faber-Ziman theory [4] for the composition dependence of S for 20 d x 4 70 in Zrloo-zNk cannot be extended to alloys with x 90 in the Zr-Ni and Hf-Ni systems. On the other hand, this is also in accord with the ideas of Ballentine [30] who concluded that the diffraction model cannot be applied to alloys in which EF is inside a d-band, being well the case here as described above.…”

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confidence: 97%

“…Most of the studies concentrated on the temperature dependence of these parameters [l, 21 and there have been some attempts to analyse their composition dependences as well [3-71. For melt-quenched (MQ) Zr,oo-5Ni, amorphous alloys, the electrical resistivity (p) has been studied over the whole composition range of glass formation (20 S x d 70 [4,8-101 and x e 90 [1,8,11,12]). On the other hand, thermoelectric-power ( S ) studies have been reported for 20 S x S 70 only [4,13,14] and no such data are available around the Ni-rich eutectic ( x P 90). It turned out from these studies that both p and S exhibit a maximum in the middle of the wide glass-forming range ( In contrast, however, to this expectation, we have found large positive room temperature thermopower values (as high as + 8 pV/K in some cases) for MQ Zrlm-.N& ribbons around…”

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confidence: 99%

Thermoelectric Power of Melt-Quenched Zr-Ni and Hf-Ni Alloys around 90 at.% Ni

1993

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From an extrapolation of previously reported thermoelectric power (TEP) data of Zr-Ni glasses for Ni contents below 70 at.%, large negative TEP values were expected for alloys with about 90 at.% Ni. By contrast, in the present work, large positive values (as high as + 8 μV / K in some cases) were obtained at room temperature for melt-quenched Zr10Ni90, Zr9Ni91 and Hf11Ni89 alloy ribbons either in the amorphous or crystalline state. The TEP was found to be positive and to increase monotonously from 4.2 K to 320 K with a broad maximum around room temperature. These anomalously large positive thermopower data are suggested to be explained based on ideas developed for crystalline solid solution alloys of Ni with early transition metals.

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“…The non-crystalline state was checked by x-ray diffraction. 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 20 Å 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 .…”

Section: Samples and Experimentsmentioning

confidence: 78%

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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Thermoelectric power of Ni-Zr metal glasses

Cited by 59 publications

References 14 publications

Measurement of low-temperature transport properties of Cu-based Cu-Zr-Ti bulk metallic glass

Measurement of low-temperature transport properties of Cu-based Cu-Zr-Ti bulk metallic glass

Thermoelectric Power of Melt-Quenched Zr-Ni and Hf-Ni Alloys around 90 at.% Ni

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

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