Microstructure and magnetic properties of as-quenched cubic and tetragonal La(Fe1-xSix)13 compounds

K. Niitsu; S. Fujieda; A. Fujita; R. Kainuma

doi:10.1016/j.jallcom.2013.05.059

Microstructure and magnetic properties of as-quenched cubic and tetragonal La(Fe_1-xSi_x)₁₃ compounds

K. Niitsu, S. Fujieda, A. Fujita, R. Kainuma

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

10 Citations (Scopus)

Abstract

The microstructure and magnetic properties of cubic- and tetragonal-La(Fe_1xSi_x)₁₃ compounds were systematically investigated. Obtained XRD patterns revealed that a semi-ordered tetragonal-La(Fe_1xSi_x) ₁₃ phase (termed the τ'₂ phase in this work) appears due to quenching from the Si-rich concentration range of the cubic-La(Fe _1xSi_x)₁₃ (τ₁) single phase region, whose tetragonality, namely the ratio of short and long axes, is lower than that of the known tetragonal Ce₂Ni₁₇Si ₉-type La(Fe_1xSi_x)₁₃ (τ₂) phase. It was also found that the τ'₂ phase has not only periodically configurated twin boundaries as a microstructural feature but also unique concentration dependence of magnetic properties, i.e., Curie temperature and spontaneous magnetization drastically decrease with increasing Si concentration.

Original language	English
Pages (from-to)	220-227
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	578
DOIs	https://doi.org/10.1016/j.jallcom.2013.05.059
Publication status	Published - 2013

Keywords

Intermetallics
Magnetocaloric
Microstructure
Order-disorder effects
Phase transitions
Rare earth alloys and compounds

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2013.05.059

Cite this

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title = "Microstructure and magnetic properties of as-quenched cubic and tetragonal La(Fe1-xSix)13 compounds",

abstract = "The microstructure and magnetic properties of cubic- and tetragonal-La(Fe1xSix)13 compounds were systematically investigated. Obtained XRD patterns revealed that a semi-ordered tetragonal-La(Fe1xSix) 13 phase (termed the τ'2 phase in this work) appears due to quenching from the Si-rich concentration range of the cubic-La(Fe 1xSix)13 (τ1) single phase region, whose tetragonality, namely the ratio of short and long axes, is lower than that of the known tetragonal Ce2Ni17Si 9-type La(Fe1xSix)13 (τ2) phase. It was also found that the τ'2 phase has not only periodically configurated twin boundaries as a microstructural feature but also unique concentration dependence of magnetic properties, i.e., Curie temperature and spontaneous magnetization drastically decrease with increasing Si concentration.",

keywords = "Intermetallics, Magnetocaloric, Microstructure, Order-disorder effects, Phase transitions, Rare earth alloys and compounds",

author = "K. Niitsu and S. Fujieda and A. Fujita and R. Kainuma",

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T1 - Microstructure and magnetic properties of as-quenched cubic and tetragonal La(Fe1-xSix)13 compounds

AU - Niitsu, K.

AU - Fujieda, S.

AU - Fujita, A.

AU - Kainuma, R.

PY - 2013

Y1 - 2013

N2 - The microstructure and magnetic properties of cubic- and tetragonal-La(Fe1xSix)13 compounds were systematically investigated. Obtained XRD patterns revealed that a semi-ordered tetragonal-La(Fe1xSix) 13 phase (termed the τ'2 phase in this work) appears due to quenching from the Si-rich concentration range of the cubic-La(Fe 1xSix)13 (τ1) single phase region, whose tetragonality, namely the ratio of short and long axes, is lower than that of the known tetragonal Ce2Ni17Si 9-type La(Fe1xSix)13 (τ2) phase. It was also found that the τ'2 phase has not only periodically configurated twin boundaries as a microstructural feature but also unique concentration dependence of magnetic properties, i.e., Curie temperature and spontaneous magnetization drastically decrease with increasing Si concentration.

AB - The microstructure and magnetic properties of cubic- and tetragonal-La(Fe1xSix)13 compounds were systematically investigated. Obtained XRD patterns revealed that a semi-ordered tetragonal-La(Fe1xSix) 13 phase (termed the τ'2 phase in this work) appears due to quenching from the Si-rich concentration range of the cubic-La(Fe 1xSix)13 (τ1) single phase region, whose tetragonality, namely the ratio of short and long axes, is lower than that of the known tetragonal Ce2Ni17Si 9-type La(Fe1xSix)13 (τ2) phase. It was also found that the τ'2 phase has not only periodically configurated twin boundaries as a microstructural feature but also unique concentration dependence of magnetic properties, i.e., Curie temperature and spontaneous magnetization drastically decrease with increasing Si concentration.

KW - Intermetallics

KW - Magnetocaloric

KW - Microstructure

KW - Order-disorder effects

KW - Phase transitions

KW - Rare earth alloys and compounds

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