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Local Atomic Structures in Amorphous and Quasicrystalline Zr70Ni10Pt20 and Zr80Pt20 Alloys by the Anomalous X-ray Scattering Method

Published online by Cambridge University Press:  17 March 2011

Eiichiro Matsubara
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Takahiro Nakamura
Affiliation:
Department of Material Science, Graduate School, Tohoku University, Sendai, 980-8579, Japan
Masaki Sakurai
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Muneyuki Imafuku
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation (JST), Sendai 982-0807, Japan
Shigeo Sato
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation (JST), Sendai 982-0807, Japan
Jyunji Saida
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation (JST), Sendai 982-0807, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Abstract

Local atomic structures around Zr and Pt in a quasicrystalline Zr80Pt20 alloy, and amorphous and quasicrystalline Zr70Ni10Pt20 alloys have been determined by the anomalous x-ray scattering (AXS) method. A distinct prepeak observed in an intensity profile of the amorphous Zr70Ni10Pt20 alloy indicates existence of strong chemical short-range order (CSRO) clusters in the amorphous phase. Total coordination numbers around Zr and Pt in a nearest neighbor region in both alloys have been evaluated. The values around Pt are almost equal to 12 in the amorphous and quasicrystalline states suggest formation of icosahedral clusters around Pt. Some of crystalline structures formed from the quasicrystalline phases by annealing consist of icosahedral clusters of Zr and Ni atoms, or polyhedral clusters of Zr and Pt atoms similar with icosahedral clusters. The present result appears to support that the phase transformation from the amorphous to the crystal through the quasicrystal is explained by the icosahedral CSRO clusters in the amorphous and quasicrystalline states.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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