High-temperature optical properties and stability of selective absorbers based on quasicrystalline AlCuFe

Eisenhammer, T.; Haugeneder, A.; Mahr, Alexander

doi:10.1016/s0927-0248(98)00089-0

Cited by 19 publications

(5 citation statements)

References 12 publications

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“…Results of The reflectivity response of the Al-Cu-Fe-B, Al-Pd-Mn system on all the frequency domain could be found in 15 , 15,17 , respectively. Partial optical data of the Al-Cu-Fe system could be found in Homes et al 18 and Eisenhammer et al, 19 Ti-Ni-Zr optical data are new. Optical data of approximant AlCrFe- ( brass phase) was already published.…”

Section: Introductionmentioning

confidence: 94%

Optical reflectivity as a simple diagnostic method for testing structural quality of icosahedral quasicrystals

Brien¹,

Dauscher

Machizaud³

2006

Journal of Applied Physics

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The optical reflectivity of Al-based and Ti-based quasicrystalline and approximant samples were investigated versus the quality of their structural morphology using optical reflectometry, X-ray diffraction and transmission electron microscopy. The different structural morphologies were obtained using three different preparation processes : sintering, pulsed laser deposition and reactive cathodic magnetron sputtering. The work demonstrates that the canonical behaviour of icosahedral state in specular reflectivity is extremely sensitive to different and very fine aspects of the microstructure : sizes of grains smaller than 50 nm, slight local diffuse disorder and shifts away from the icosahedral crystallographic structure (approximants). The work explains why the optical properties of the same kind of quasicrystals found in literature sometimes reveal a different behaviour from one author to another. The study then confirms the work of some authors and definitely shows that the canonical behaviour of icosahedral state in specular reflectivity over the 30000 -50000 cm -1 domain is characterized by a decreasing function made of steps. It also shows that this behaviour can be interpreted thanks to the cluster hierarchy of the model of Janot.

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Section: Introductionmentioning

confidence: 94%

Optical reflectivity as a simple diagnostic method for testing structural quality of icosahedral quasicrystals

Brien¹,

Dauscher

Machizaud³

2006

Journal of Applied Physics

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“…Ni, Fe) to reach higher efficiency protective multilayer [18,19]. Several SCIPs are promising candidates for applications in photovoltaics [12,13]. The reinforcing effect of fine SCIP particles in composites of various matrices was also reported [20][21][22].…”

Section: Introductionmentioning

confidence: 95%

“…SCIPs were observed mainly in binary and ternary CMAs; in special cases also in quaternary or multi-component alloys [3][4][5]. Recently, the Al-base SCIPs were mostly studied, because of their good scientific potential [1][2][3][4][5][6][7][8][9][10] and unique combination of properties, being interesting for practical applications [11][12][13][14][15][16][17][18][19][20][21][22]. For instance, CMAs are used as coatings or thin films, due to their good oxidation resistance, low coefficient of friction, low adhesion, reduced wetting with water, and high hardness [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Phase transitions in selected Al-Pd-Co alloys during continuous cooling

Černičková¹,

Ďuriška²,

Drienovský³

et al. 2018

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The continuous cooling from 1300 • C to ambient temperature by a differential thermal analyser was used to estimate the non-equilibrium evolution of phases in alloys Al67Pd14.6Co18.4, Al76Pd11Co13, Al71.7Pd14.4Co13.9, and Al67.4Pd20.6Co12. To compare non-equilibrium and near-equilibrium microstructures, the same alloys were also annealed at 850 • C for 500 h. Besides the differential thermal analysis, the X-ray diffraction, the scanning electron microscopy including energy dispersive X-ray spectroscopy, and the Vickers microhardness test were used in the investigation. Various combinations of phases β, U , δ, εn, F , Al5Co2, and Al9Co2 were identified in the alloys; there was no difference between continuously cooled and as-annealed conditions in the phase occurrence. The alloys, as sequenced above, were considered to solidify through phases β + V (concurrently), F , V , and β, respectively. Temperature ranges of solidification were also estimated. Based on the experimental results and other available data, the sequences of non-equilibrium phase transitions were proposed for several alloys of the still less-known Al-Pd-Co system. K e y w o r d s : Al-Pd-Co, continuous cooling, phase characterisation, differential thermal analysis, phase evolution

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“…In view of their high absorbance in the solar wavelength region and their high reflectance at longer wavelength, CMAs and QCs soon appeared as good candidates for use as solar selective absorbers. Extensive studies have been performed by Eisenhammer et al on AlCuFe thin films and cermets [22][23][24][25][26][27]. Devices consisting of sandwich systems of Al 2 O 3 /AlCuFe/Al 2 O 3 films deposited on copper films on Al 2 O 3 coated silicon were produced, showing 90% solar absorbance and low thermal emittance.…”

Section: Insert Figurementioning

confidence: 99%