Why Study Quasicrystals at High Pressures?

Krauß, G.; Steurer, Walter

doi:10.1007/978-1-4020-2102-2_32

Cited by 6 publications

(9 citation statements)

References 31 publications

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“…Since QCs are not close packed structures, it can be assumed that phase transitions occur at high pressure [9]. The last two decades, however, almost all studies have been conducted below 40 GPa [10]. Hence, the upper pressure stability limit of i-AlCuFe QC has not been determined.…”

Section: Introductionmentioning

confidence: 97%

X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures

et al. 2015

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Section: Introductionmentioning

confidence: 97%

X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures

et al. 2015

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“…The majority of studies are at pressures less than 40 GPa; only i-AlLiCu has exhibited a transformation to a crystalline phase within its measured pressure range. A review of high-pressure studies for various i-QC compositions has been compiled by Krauss and Steurer4.…”

mentioning

confidence: 99%

Icosahedral AlCuFe quasicrystal at high pressure and temperature and its implications for the stability of icosahedrite

Stagno

Bindi

Shibazaki

et al. 2014

Sci Rep

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The first natural-occurring quasicrystal, icosahedrite, was recently discovered in the Khatyrka meteorite, a new CV3 carbonaceous chondrite. Its finding raised fundamental questions regarding the effects of pressure and temperature on the kinetic and thermodynamic stability of the quasicrystal structure relative to possible isochemical crystalline or amorphous phases. Although several studies showed the stability at ambient temperature of synthetic icosahedral AlCuFe up to ~35 GPa, the simultaneous effect of temperature and pressure relevant for the formation of icosahedrite has been never investigated so far. Here we present in situ synchrotron X-ray diffraction experiments on synthetic icosahedral AlCuFe using multianvil device to explore possible temperature-induced phase transformations at pressures of 5 GPa and temperature up to 1773 K. Results show the structural stability of i-AlCuFe phase with a negligible effect of pressure on the volumetric thermal expansion properties. In addition, the structural analysis of the recovered sample excludes the transformation of AlCuFe quasicrystalline phase to possible approximant phases, which is in contrast with previous predictions at ambient pressure. Results from this study extend our knowledge on the stability of icosahedral AlCuFe at higher temperature and pressure than previously examined, and provide a new constraint on the stability of icosahedrite.

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“…As mentioned before, decagonal Al-Co-Cu was studied up to 19.1 GPa, using two different setups. The standard setup was used up to 10.9 GPa, and decagonal Al-Co-Cu was found to be stable in this range [5]. Therefore, this section will focus on the pressure range above 10.9 GPa using the modified setup.…”

Section: High-pressure Studiesmentioning

confidence: 99%

“…Nearly all of the known in situ high-pressure studies on quasicrystals were based on powder samples and most of them focus on icosahedral quasicrystals (see for example [5] and references therein). The applied pressures range up to 70 GPa [6] and the investigated quasicrystals show a remarkable stability in the investigated pressure ranges.…”

Section: Introductionmentioning

confidence: 99%

“…They combine periodicity and quasiperiodicity in their crystal structure and are therefore of special interest for the study of structural transitions. Until now, only decagonal quasicrystals of the Al-Co-Ni [10,6,4] and Al-Co-Cu [5] (up to 10.9 GPa) systems have been investigated. Here we report on results concerning decagonal Al-Co-Cu up to 19.1 GPa.…”

Section: Introductionmentioning

confidence: 99%

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A single-crystal high-pressure x-ray diffraction study of decagonal Al–Co–Cu up to 19.1 GPa

Krauß

Steurer

2004

J. Phys.: Condens. Matter

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An in situ single-crystal high-pressure x-ray diffraction study of decagonal Al–Co–Cu up to 19.1 GPa has been performed using diamond anvil cells and synchrotron radiation. Quantitative reciprocal space reconstruction from image plate data was used for data analysis. No significant variations with pressure were observed in Bragg as well as diffuse scattering, indicating the high stability of the quasiperiodic structure in the investigated pressure range. The bulk modulus at zero pressure was determined from fitting a second-order Birch–Murnaghan equation of state as K0 = 131(8) GPa. The influence of different crystal orientations on the accessible amount of reciprocal space data is discussed.

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Why Study Quasicrystals at High Pressures?

Cited by 6 publications

References 31 publications

X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures

X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures

Icosahedral AlCuFe quasicrystal at high pressure and temperature and its implications for the stability of icosahedrite

A single-crystal high-pressure x-ray diffraction study of decagonal Al–Co–Cu up to 19.1 GPa

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