Comparative study of the heat capacity of icosahedral quasicrystals in solid and liquid states

• Published in: Physics of the solid state Vol. 53; no. 10; pp. 1987 - 1990
• Main Authors: Prekul, A. F., Shchegolikhina, N. I., Gaiduchenko, A. B., Grushevskii, K. I.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-10-2011; Springer
• Subjects: Laws, regulations and rules; Metals; Physics; Physics and Astronomy; Solid State Physics; Toy industry; Linear Thermal Expansion Coefficient; Debye Model; Heat Capacity; Excess Heat Capacity; Beryllium Oxide
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783411100246

The heat capacity of icosahedral quasicrystals Al
63
Cu
25
Fe
12
and Al
62
Cu
25.5
Fe
12.5
has been studied at high temperatures up to 1700 K, which is by almost 400 K higher than the melting point of the material. It has been shown that the melt exhibits an excess heat capacity with respect to that determined by the Dulong-Petit law and that is a direct extension of the excess heat capacity of the solid state. It has been concluded that the excess heat capacity is related, as a whole, to the short-range order in the quasicrystal structure. This circumstance allows the identification of the orbital hybridization as the most probable mechanism of formation of the pseudogap in the electronic structure of the quasicrystals.