An electron microscopic study of hexagonal phases related to quasicrystals in Zn-Mg-RE alloys

A. Singh; E. Abe; H. Takakura; A. P. Tsai

doi:10.1016/S0968-4328(99)00130-4

An electron microscopic study of hexagonal phases related to quasicrystals in Zn-Mg-RE alloys

A. Singh, E. Abe, H. Takakura, A. P. Tsai

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

A number of hexagonal phases with inflated/deflated a lattice parameters but equal c parameters are found to exist with compositions close to that of the icosahedral phase. Surprisingly, no cubic or orthorhombic approximants are found. The closeness of the hexagonal phases to the icosahedral phase is shown through the electron diffraction features. Through stereographic analysis of the hexagonal phases it is shown that they consist of three icosahedral units rotated by 120°about a common twofold axis, forming the sixfold axis. It is suggested that this phase falls into a class of crystals closely related to both the icosahedral and decagonal quasicrystals, but are not approximants to them. These phases can instead be considered to be approximant to the hexagonal quasicrystal. (C) 2000 Elsevier Science Ltd.

Original language	English
Pages (from-to)	499-505
Number of pages	7
Journal	Micron
Volume	31
Issue number	5
DOIs	https://doi.org/10.1016/S0968-4328(99)00130-4
Publication status	Published - 2000 Oct
Externally published	Yes

Keywords

Hexagonal phases
Quasicrystals
Zn-Mg-RE alloys

ASJC Scopus subject areas

Structural Biology
Materials Science(all)
Physics and Astronomy(all)
Cell Biology

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10.1016/S0968-4328(99)00130-4

Cite this

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title = "An electron microscopic study of hexagonal phases related to quasicrystals in Zn-Mg-RE alloys",

abstract = "A number of hexagonal phases with inflated/deflated a lattice parameters but equal c parameters are found to exist with compositions close to that of the icosahedral phase. Surprisingly, no cubic or orthorhombic approximants are found. The closeness of the hexagonal phases to the icosahedral phase is shown through the electron diffraction features. Through stereographic analysis of the hexagonal phases it is shown that they consist of three icosahedral units rotated by 120°about a common twofold axis, forming the sixfold axis. It is suggested that this phase falls into a class of crystals closely related to both the icosahedral and decagonal quasicrystals, but are not approximants to them. These phases can instead be considered to be approximant to the hexagonal quasicrystal. (C) 2000 Elsevier Science Ltd.",

keywords = "Hexagonal phases, Quasicrystals, Zn-Mg-RE alloys",

author = "A. Singh and E. Abe and H. Takakura and Tsai, {A. P.}",

note = "Funding Information: This work is supported by the Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation.",

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T1 - An electron microscopic study of hexagonal phases related to quasicrystals in Zn-Mg-RE alloys

AU - Singh, A.

AU - Abe, E.

AU - Takakura, H.

AU - Tsai, A. P.

N1 - Funding Information: This work is supported by the Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation.

PY - 2000/10

Y1 - 2000/10

N2 - A number of hexagonal phases with inflated/deflated a lattice parameters but equal c parameters are found to exist with compositions close to that of the icosahedral phase. Surprisingly, no cubic or orthorhombic approximants are found. The closeness of the hexagonal phases to the icosahedral phase is shown through the electron diffraction features. Through stereographic analysis of the hexagonal phases it is shown that they consist of three icosahedral units rotated by 120°about a common twofold axis, forming the sixfold axis. It is suggested that this phase falls into a class of crystals closely related to both the icosahedral and decagonal quasicrystals, but are not approximants to them. These phases can instead be considered to be approximant to the hexagonal quasicrystal. (C) 2000 Elsevier Science Ltd.

AB - A number of hexagonal phases with inflated/deflated a lattice parameters but equal c parameters are found to exist with compositions close to that of the icosahedral phase. Surprisingly, no cubic or orthorhombic approximants are found. The closeness of the hexagonal phases to the icosahedral phase is shown through the electron diffraction features. Through stereographic analysis of the hexagonal phases it is shown that they consist of three icosahedral units rotated by 120°about a common twofold axis, forming the sixfold axis. It is suggested that this phase falls into a class of crystals closely related to both the icosahedral and decagonal quasicrystals, but are not approximants to them. These phases can instead be considered to be approximant to the hexagonal quasicrystal. (C) 2000 Elsevier Science Ltd.

KW - Hexagonal phases

KW - Quasicrystals

KW - Zn-Mg-RE alloys

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JF - Micron and Microscopica Acta

IS - 5

ER -

An electron microscopic study of hexagonal phases related to quasicrystals in Zn-Mg-RE alloys

Abstract

Keywords

ASJC Scopus subject areas

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