Structural study of the pseudobinary Y(Ni,Cu)2 system

V. Paul-Boncour; A. Lindbaum; E. Gratz; E. Leroy; A. Percheron-Guégan

doi:10.1016/S0966-9795(02)00120-6

Structural study of the pseudobinary Y(Ni,Cu)₂ system

V. Paul-Boncour, A. Lindbaum, E. Gratz, E. Leroy, A. Percheron-Guégan

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

4 Citations (Scopus)

Abstract

The pseudobinary Y(Ni_1-xCu_x)₂ compounds have been investigated by X-ray and neutron diffraction, density measurements as well as with electron probe microanalysis. The goal was to understand the mechanism behind the structural change from the cubic structure of Y_0.95Ni₂ (a cubic superstructure of the cubic Laves phase with ordered vacancies on the Y site) into the orthorhombic CeCu₂ type structure of YCu₂. 20% of Cu can be substituted for Ni in Y_0.95Ni₂ accompanied by an increase of the number of Y vacancies in the cubic superstructure. On the Cu-rich side a solid solution was found from YCu₂ to Y(Ni_0.5Cu_0.5)₂. The substitution for Ni in the orthorhombic structure mainly causes a decrease of the lattice parameter a, giving rise to a 3.5% contraction of the unit cell volume. These two solid solutions are separated by a two-phase region. The thermal expansion among the cubic compounds hardly changes with the Cu concentration, whereas it increases in the orthorhombic range towards YCu₂.

Original language	English
Pages (from-to)	1011-1017
Number of pages	7
Journal	Intermetallics
Volume	10
Issue number	10
DOIs	https://doi.org/10.1016/S0966-9795(02)00120-6
Publication status	Published - Oct 2002
Externally published	Yes

Keywords

A. Laves phases, rare-earth intermetallics
B. Crystal chemistry of intermetallics

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10.1016/S0966-9795(02)00120-6

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title = "Structural study of the pseudobinary Y(Ni,Cu)2 system",

abstract = "The pseudobinary Y(Ni1-xCux)2 compounds have been investigated by X-ray and neutron diffraction, density measurements as well as with electron probe microanalysis. The goal was to understand the mechanism behind the structural change from the cubic structure of Y0.95Ni2 (a cubic superstructure of the cubic Laves phase with ordered vacancies on the Y site) into the orthorhombic CeCu2 type structure of YCu2. 20% of Cu can be substituted for Ni in Y0.95Ni2 accompanied by an increase of the number of Y vacancies in the cubic superstructure. On the Cu-rich side a solid solution was found from YCu2 to Y(Ni0.5Cu0.5)2. The substitution for Ni in the orthorhombic structure mainly causes a decrease of the lattice parameter a, giving rise to a 3.5% contraction of the unit cell volume. These two solid solutions are separated by a two-phase region. The thermal expansion among the cubic compounds hardly changes with the Cu concentration, whereas it increases in the orthorhombic range towards YCu2.",

keywords = "A. Laves phases, rare-earth intermetallics, B. Crystal chemistry of intermetallics",

author = "V. Paul-Boncour and A. Lindbaum and E. Gratz and E. Leroy and A. Percheron-Gu{\'e}gan",

year = "2002",

month = oct,

doi = "10.1016/S0966-9795(02)00120-6",

language = "English",

volume = "10",

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T1 - Structural study of the pseudobinary Y(Ni,Cu)2 system

AU - Paul-Boncour, V.

AU - Lindbaum, A.

AU - Gratz, E.

AU - Leroy, E.

AU - Percheron-Guégan, A.

PY - 2002/10

Y1 - 2002/10

N2 - The pseudobinary Y(Ni1-xCux)2 compounds have been investigated by X-ray and neutron diffraction, density measurements as well as with electron probe microanalysis. The goal was to understand the mechanism behind the structural change from the cubic structure of Y0.95Ni2 (a cubic superstructure of the cubic Laves phase with ordered vacancies on the Y site) into the orthorhombic CeCu2 type structure of YCu2. 20% of Cu can be substituted for Ni in Y0.95Ni2 accompanied by an increase of the number of Y vacancies in the cubic superstructure. On the Cu-rich side a solid solution was found from YCu2 to Y(Ni0.5Cu0.5)2. The substitution for Ni in the orthorhombic structure mainly causes a decrease of the lattice parameter a, giving rise to a 3.5% contraction of the unit cell volume. These two solid solutions are separated by a two-phase region. The thermal expansion among the cubic compounds hardly changes with the Cu concentration, whereas it increases in the orthorhombic range towards YCu2.

AB - The pseudobinary Y(Ni1-xCux)2 compounds have been investigated by X-ray and neutron diffraction, density measurements as well as with electron probe microanalysis. The goal was to understand the mechanism behind the structural change from the cubic structure of Y0.95Ni2 (a cubic superstructure of the cubic Laves phase with ordered vacancies on the Y site) into the orthorhombic CeCu2 type structure of YCu2. 20% of Cu can be substituted for Ni in Y0.95Ni2 accompanied by an increase of the number of Y vacancies in the cubic superstructure. On the Cu-rich side a solid solution was found from YCu2 to Y(Ni0.5Cu0.5)2. The substitution for Ni in the orthorhombic structure mainly causes a decrease of the lattice parameter a, giving rise to a 3.5% contraction of the unit cell volume. These two solid solutions are separated by a two-phase region. The thermal expansion among the cubic compounds hardly changes with the Cu concentration, whereas it increases in the orthorhombic range towards YCu2.

KW - A. Laves phases, rare-earth intermetallics

KW - B. Crystal chemistry of intermetallics

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DO - 10.1016/S0966-9795(02)00120-6

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JF - Intermetallics

IS - 10

ER -

Structural study of the pseudobinary Y(Ni,Cu)₂ system

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Keywords

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