Formation of F- and P-Type Icosahedral Quasicrystals in the Zn-Mg-Ho Alloy System

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概要

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• Two types of icosahedral quasicrystals, F- and P-types, formed at 563℃ in the Zn_<60>Mg_<40-x>Ho_x alloy depending on Ho content. In the composition range of 6 ≦ x ≦ 10, F-type icosahedral quasicrystal formed as a major phase in these alloys. The intensity of superlattice reflections which occurred due to F-type ordering became weaker in the alloys with lower Ho content. At x = 5, P-type icosahedral quasicrystal formed, coexisting with MgZn_2-type Laves phase at 563℃ and 503℃. Some electron diffraction patterns of the P-type icosahedral quasicrystal exhibited diffuse scattering intensity at positions corresponding to F-type superlattice reflections. By annealing at 403℃, a mixture of the P-type icosahedral quasicrystal and the MgZn_2-type phase changed to a mixture of the F-type quasicrystal and a decagonal quasicrystal. The former state was reversibly obtained by additional annealing at 503℃. These experimental results support the interpretation that the three types of quasicrystals form as a thermodynamically stable state in the Zn-Mg-Ho alloy system.

• 社団法人応用物理学会の論文
• 1998-10-15

著者

• Ishimasa Tsutomu

  Department Of Physical Science And Engineering School Of Engineering Nagoya University

• Ishimasa Tsutomu

  Department Of Materials Science Faculty Of Science Hiroshima University

• Shimizu Takayuki

  Department Of Cardiology Saiseikai Ibaraki Hospital

• Shimizu Takayuki

  Department Of Nuclear Engineering Graduate School Of Engineering Nagoya University

• Shimizu Takayuki

  Department Of Agro-bioscience Faculty Of Agriculture Iwate University

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