[110]TA1 Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn2 Alloy

Akira Nagasawa; Rie Yamauchi; Kazue Kita; Tomoko Makita; Yukio Morii

doi:10.1143/JPSJ.63.995

[110]TA₁ Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn₂ Alloy

Akira Nagasawa, Rie Yamauchi, Kazue Kita, Tomoko Makita, Yukio Morii

IMR - Cooperative Research and Development Center for Advanced Materials

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

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Abstract

The present study on the [110] TA1 phonon dispersion relation in a AuCuZn2 alloy reveals that the lattice instability towards the 18R martensite is characteristic of only the Heusler phase existing stably below about 670 K, which is the disordering temperature to the B2-phase. Anomalous peak appearing near ζ=2/3 [110] in the Heuslerphase is also examined by neutron elastic scattering experiments in a wide range of temperature. It is evident that such a peak has no relation to the 2/3-dip on the [110] TA, phonon branch observed in the Heusler-phase but it is originated from vacancies existing inherently and regularly in the B2-lattice.

Original language	English
Pages (from-to)	995-1000
Number of pages	6
Journal	Journal of the Physical Society of Japan
Volume	63
Issue number	3
DOIs	https://doi.org/10.1143/JPSJ.63.995
Publication status	Published - 1994

Keywords

2/3 [110] peak
2/3-dip
AuCuZn2
B2-phase
Heusler-phase
[110] TA1 phonon branch
lattice instability
pre-martensitic state
vacancy

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10.1143/JPSJ.63.995

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title = "[110]TA1 Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn2 Alloy",

abstract = "The present study on the [110] TA1 phonon dispersion relation in a AuCuZn2 alloy reveals that the lattice instability towards the 18R martensite is characteristic of only the Heusler phase existing stably below about 670 K, which is the disordering temperature to the B2-phase. Anomalous peak appearing near ζ=2/3 [110] in the Heuslerphase is also examined by neutron elastic scattering experiments in a wide range of temperature. It is evident that such a peak has no relation to the 2/3-dip on the [110] TA, phonon branch observed in the Heusler-phase but it is originated from vacancies existing inherently and regularly in the B2-lattice.",

keywords = "2/3 [110] peak, 2/3-dip, AuCuZn2, B2-phase, Heusler-phase, [110] TA1 phonon branch, lattice instability, pre-martensitic state, vacancy",

author = "Akira Nagasawa and Rie Yamauchi and Kazue Kita and Tomoko Makita and Yukio Morii",

year = "1994",

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language = "English",

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T1 - [110]TA1 Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn2 Alloy

AU - Nagasawa, Akira

AU - Yamauchi, Rie

AU - Kita, Kazue

AU - Makita, Tomoko

AU - Morii, Yukio

PY - 1994

Y1 - 1994

N2 - The present study on the [110] TA1 phonon dispersion relation in a AuCuZn2 alloy reveals that the lattice instability towards the 18R martensite is characteristic of only the Heusler phase existing stably below about 670 K, which is the disordering temperature to the B2-phase. Anomalous peak appearing near ζ=2/3 [110] in the Heuslerphase is also examined by neutron elastic scattering experiments in a wide range of temperature. It is evident that such a peak has no relation to the 2/3-dip on the [110] TA, phonon branch observed in the Heusler-phase but it is originated from vacancies existing inherently and regularly in the B2-lattice.

AB - The present study on the [110] TA1 phonon dispersion relation in a AuCuZn2 alloy reveals that the lattice instability towards the 18R martensite is characteristic of only the Heusler phase existing stably below about 670 K, which is the disordering temperature to the B2-phase. Anomalous peak appearing near ζ=2/3 [110] in the Heuslerphase is also examined by neutron elastic scattering experiments in a wide range of temperature. It is evident that such a peak has no relation to the 2/3-dip on the [110] TA, phonon branch observed in the Heusler-phase but it is originated from vacancies existing inherently and regularly in the B2-lattice.

KW - 2/3 [110] peak

KW - 2/3-dip

KW - AuCuZn2

KW - B2-phase

KW - Heusler-phase

KW - [110] TA1 phonon branch

KW - lattice instability

KW - pre-martensitic state

KW - vacancy

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

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ER -

[110]TA₁ Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn₂ Alloy

Abstract

Keywords

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