The electrical conductivity of single-grain Al–Pd–Re quasicrystals

Fisher, I. R.; Xie, Xiaozhu; Tudosă, Ioan; Gao, Chunxiao; Song, Changyong; Canfield, Paul C.; Kracher, A.; Dennis, K. W.; Abanoz, D.; Kramer, M. J.

doi:10.1080/13642810208218363

Cited by 11 publications

(35 citation statements)

References 26 publications

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“…s monotonically increases with increasing temperature for all samples. This nonmetallic behavior is in agreement with the previous results for the poly-grain and mono-crystalline Al--Pd--Re quasicrystals [2,[5][6][7][8][9][10][11][12][13][14][15][16]. The s increases with increasing the relative density.…”

Section: Methodssupporting

confidence: 81%

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Thermoelectric properties of Al–Pd–Re quasicrystal sintered by Spark Plasma Sintering (SPS): effect of improvement of microstructure

Takagiwa¹,

Kamimura²,

Hosoi³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Quasicrystals / Thermoelectric properties / Microstructure / Spark Plasma Sintering (SPS) / Al--Pd--Re Abstract. We report the thermoelectric properties of poly-grain Al--Pd--Re icosahedral quasicrystals and discuss an effect of improvement of their microstructure. The improvement of microstructure by using Spark Plasma Sintering (SPS) method resulted into a large increase of the electrical conductivity but less increase of the thermal conductivity. The relative density dramatically increased up to more than 90% by SPS. On the other hand, the microstructure itself does not have critical influence on the Seebeck coefficient, which is found to be strongly correlated with e=a (sample's compositions). Consequently, the dimensionless figure of merit (ZT) increased three times from 0.05 to 0.15.

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Section: Methodssupporting

confidence: 81%

“…À1 at 373 K. The electrical resistivity of the samples (B) or (C) ranges 2.2-2.3 (mW cm) at 373 K, which is comparable with the mono-crystalline phase [11,[15][16]. On the other hand, the temperature coefficient of the s was basically unchanged.…”

Section: Resultsmentioning

confidence: 63%

Thermoelectric properties of Al–Pd–Re quasicrystal sintered by Spark Plasma Sintering (SPS): effect of improvement of microstructure

Takagiwa¹,

Kamimura²,

Hosoi³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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“…[6][7][8][9][10] However, the electronic contribution to the specific heat in Zn-Mg-Y was reported to be similar to Zn metal, indicating no reduction of the density of states (DOS) at E F , 4 although in the same work a distinct feature that was assigned to an excitation across a pseudogap was observed from optical conductivity study. 4 It was also reported 11 that their resistivity (150-200 µΩ-cm) is an order of magnitude lower than Al-based quasicrystals such as Al-Pd-Mn 12 or highly conducting compositions of Al-Pd-Re, 13 again pointing towards a higher DOS at E F in the former. Since photoelectron spectroscopy is a direct probe of the electron states, the pseudogap has been studied extensively using this technique, albeit with low photon energies (ultra violet to soft x-ray range) that provided information about the surface electronic structure because of the small escape depth of photoelectrons with low kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

et al. 2015

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We use bulk sensitive hard x-ray photoelectron spectroscopy to provide unambiguous evidence for a pseudogap in the density of states around the Fermi level in icosahedral Zn-Mg-Y and Zn-Mg-Dy quasicrystals, in agreement with our density functional theory calculations. The pseudogap in these Zn-based quasicrystals is less pronounced compared to the Al-based ones such as Al-Pd-Mn and AlCu-Fe [J. Nayak et al., Phys. Rev. Lett. 109, 216403 (2012)]. This observation is in agreement with transport studies that indicate a larger charge carrier concentration in the Zn-based quasicrystals. Compared to Zn-Mg-Dy, the pseudogap is somewhat deeper in Zn-Mg-Y. The larger width of the Mg 1s and Zn 2p core-level spectra in Zn-Mg-Y is explained by different configurations of the local atomic surrounding compared to Zn-Mg-Dy.

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“…We provide arguments why the case for an extrinsic origin of the insulating behavior in i-AlPdRe samples [6,7,11] is inconclusive. Specifically, our chemical analysis shows that the composition range common to highly resistive ribbons and ingots is significantly different from that of the few metallic single-grains measured.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, this alloy of metals becomes an insulator, the origin for this remarkable result being attributed to the specificity of the i-AlPdRe phase. However, in the early 2000's, electrical measurements performed on i-AlPdRe single-grains [5,6] showed significantly higher conductivity σ 4K > 200Ω −1 cm −1 and lower RRR < 2.5, thereby placing i-AlPdRe single grains on the metallic side of the MIT. These values are similar to those observed in the i-AlCuFe and i-AlPdMn phases.…”

Section: Introductionmentioning

confidence: 99%

The question of intrinsic origin of the metal-insulator transition in i-AlPdRe quasicrystal

Delahaye

Berger

2015

Eur. Phys. J. B

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The icosahedral (i-) AlPdRe is the most resistive quasicrystalline alloy discovered so far. Resistivities (ρ) of 1Ωcm at 4K and correlated resistance ratios (RRR = ρ4K /ρ300K ) of more than 200 are observed in polycrystalline samples. These values are two orders of magnitude larger than for the isomorphous i-AlPdMn phase. We discuss here the controversial microscopic origin of the i-AlPdRe alloy electrical specificity. It has been proposed that the high resistivity values are due to extrinsic parameters, such as secondary phases or oxygen contamination. From comprehensive measurements and data from the literature including electronic transport correlated with micro structural and micro chemical analysis, we show that on the contrary there is mounting evidence in support of an origin intrinsic to the i-phase. Similarly to the other quasicrystalline alloys, the electrical resistivity of the i-AlPdRe samples depends critically on minute changes in the structural quality and chemical composition. The low resistivity in i-AlPdRe single-grains compared to polycrystaline samples can be explained by difference in chemical composition, heterogeneity and thermal treatment.

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The electrical conductivity of single-grain Al–Pd–Re quasicrystals

Cited by 11 publications

References 26 publications

Thermoelectric properties of Al–Pd–Re quasicrystal sintered by Spark Plasma Sintering (SPS): effect of improvement of microstructure

Thermoelectric properties of Al–Pd–Re quasicrystal sintered by Spark Plasma Sintering (SPS): effect of improvement of microstructure

Bulk electronic structure of Zn-Mg-Y and Zn-Mg-Dy icosahedral quasicrystals

The question of intrinsic origin of the metal-insulator transition in i-AlPdRe quasicrystal

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