High-temperature heat capacity of the Al63Cu25Fe12 quasicrystal

Prekul, A. F.; Казанцев, В. А.; Shchegolikhina, N. I.; Gulyaeva, R. I.; Edagawa, Keiichi

doi:10.1134/s1063783408110024

Cited by 30 publications

(9 citation statements)

References 4 publications

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“…Unusual behavior in terms of the specific heat at high temperatures 46) is one of the candidates for such physical properties. High-temperature specific heat measurements have been reported for icosahedral AlPdMn 4,5) and AlCuFe, 6) and decagonal AlCu Co 4,5) QCs, all of which show large upward deviations from the Dulong-Petit value; the specific heat per atom at constant volume c V , is 4.55k B (k B : the Boltzman constant) at high temperatures, which is substantially larger than the Dulong-Petit value of 3k B . Originating from the high-dimensional nature of quasiperiodicity, QCs have a special type of elastic degrees of freedom that are termed as phason degrees of freedom.…”

Section: Introductionmentioning

confidence: 94%

“…Such extra degrees of freedom in QCs may result in c V values exceeding the Dulong-Petit value, 4,5) although it can also arise from an electronic origin. 6,10) In any case, to determine whether the unusual behavior of c V described above is a characteristic feature commonly seen in QCs, we need to carry out more experiments with QCs of various alloy systems.…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Specific Heat of Al–Cu–Ru Icosahedral Quasicrystals and 1/1 Crystal Approximants

et al. 2021

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

High-Temperature Specific Heat of Al–Cu–Ru Icosahedral Quasicrystals and 1/1 Crystal Approximants

et al. 2021

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“…Therefore, calorimetric investigations were performed for a number of quasicrystalline compounds with different chemical compositions and structural qualities in various temperature ranges from ultralow temperatures to melting points [14][15][16][17][18]. Despite a large variety of objects, all these investigations share a common trait.…”

Section: Features Of the Electronic Specific Heat Capacitymentioning

confidence: 99%

“…The asymptotic approximation to this limit may be assessed using the Debye model, exactly which we chose to perform. Details can be found in [8,18].…”

Section: Features Of the Electronic Specific Heat Capacitymentioning

confidence: 99%

Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Prekul

Shchegolikhina

2016

Crystals

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This article is not a review in the conventional sense. Rather, it is a monographic study of the implications of detection in Al-Cu-Fe quasicrystals of the electronic heat capacity contributions associated with the two-level electron excitations. Our aim was to reveal correlations between these contributions, on the one hand, and specific features of electron transport, magnetic susceptibility, Hall-effect, tunnelling and optical spectra, on the other hand. It is shown that the full range of these features can be understood in the framework of the unified conceptual scheme based on two-level electron excitations.

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“…Here, we selected Au and Pt as substitution elements for Cu because of the large atomic radii, strong bond strength with Al, and a high melting point of Pt. From the experimental point of view, investigating high-temperature thermal conductivity is of great importance for controlling the unusual increase in the specific heat [15][16][17][18][19] for Al-based QCs and approximants, which provides an additional route to tune the thermoelectric [3] and thermal rectifier [12] properties.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Thermal Conductivity for Icosahedral Al-Cu-Fe Quasicrystal through Heavy Element Substitution

et al. 2021

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Icosahedral Al-Cu-Fe quasicrystal (QC) shows moderate electrical conductivity and low thermal conductivity, and both p- and n-type conduction can be controlled by tuning the sample composition, making it potentially suited for thermoelectric materials. In this work, we investigated the effect of introducing chemical disorder through heavy element substitution on the thermal conductivity of Al-Cu-Fe QC. We substituted Au and Pt elements for Cu up to 3 at% in a composition of Al63Cu25Fe12, i.e., Al63Cu25−x(Au,Pt)xFe12 (x = 0, 1, 2, 3). The substitutions of Au and Pt for Cu reduced the phonon thermal conductivity at 300 K (κph,300K) by up to 17%. The reduction of κph,300K is attributed to a decrease in the specific heat and phonon relaxation time through heavy element substitution. We found that increasing the Pt content reduced the specific heat at high temperatures, which may be caused by the locked state of phasons. The observed glass-like low values of κph,300K (0.9–1.1 W m−1 K−1 at 300 K) for Al63Cu25−x(Au,Pt)xFe12 are close to the lower limit calculated using the Cahill model.

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High-temperature heat capacity of the Al63Cu25Fe12 quasicrystal

Cited by 30 publications

References 4 publications

High-Temperature Specific Heat of Al–Cu–Ru Icosahedral Quasicrystals and 1/1 Crystal Approximants

High-Temperature Specific Heat of Al–Cu–Ru Icosahedral Quasicrystals and 1/1 Crystal Approximants

Two-Level Electron Excitations and Distinctive Physical Properties of Al-Cu-Fe Quasicrystals

Reduction of Thermal Conductivity for Icosahedral Al-Cu-Fe Quasicrystal through Heavy Element Substitution

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