Significant Zero Thermal Expansion Via Enhanced Magnetoelastic Coupling in Kagome Magnets

Jiawang Xu; Zhan Wang; He Huang; Zhuolin Li; Xiang Chi; Dingsong Wang; Jingyan Zhang; Xinqi Zheng; Jun Shen; Wenda Zhou; Yang Gao; Jianwang Cai; Tongyun Zhao; Shouguo Wang; Ying Zhang; Baogen Shen

doi:10.1002/adma.202208635

Significant Zero Thermal Expansion Via Enhanced Magnetoelastic Coupling in Kagome Magnets

Jiawang Xu, Zhan Wang, He Huang, Zhuolin Li, Xiang Chi, Dingsong Wang, Jingyan Zhang, Xinqi Zheng, Jun Shen, Wenda Zhou, Yang Gao, Jianwang Cai, Tongyun Zhao, Shouguo Wang, Ying Zhang^*, Baogen Shen

^*Corresponding author for this work

School of Mechanical Engineering

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

16 Citations (Scopus)

Abstract

Zero-thermal-expansion (ZTE) alloys, as dimensionally stable materials, are urgently required in many fields, particularly in highly advanced modern industries. In this study, high-performance ZTE with a negligible coefficient of thermal expansion a_v as small as 2.4 ppm K⁻¹ in a broad temperature range of 85–245 K is discovered in Hf_0.85Ta_0.15Fe₂C_0.01 magnet. It is demonstrated that the addition of trace interstitial atom C into Ta-substituted Hf_0.85Ta_0.15Fe₂ exhibits significant capability to tune the normal positive thermal expansion into high-performance ZTE via enhanced magnetoelastic coupling in stabilized ferromagnetic structure. Moreover, direct observation of the magnetic transition between ferromagnetic and triangular antiferromagnetic states via Lorentz transmission electron microscopy, along with corresponding theoretical calculations, further uncovers the manipulation mechanism of ZTE and negative thermal expansion. A convenient and effective method to optimize thermal expansion and achieve ZTE with interstitial C addition may result in broadened applications based on the strong correlation between the magnetic properties and crystal structure.

Original language	English
Article number	2208635
Journal	Advanced Materials
Volume	35
Issue number	8
DOIs	https://doi.org/10.1002/adma.202208635
Publication status	Published - 23 Feb 2023

Keywords

kagome magnets
magnetic transition
magnetoelastic coupling
negative thermal expansion
zero thermal expansion

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title = "Significant Zero Thermal Expansion Via Enhanced Magnetoelastic Coupling in Kagome Magnets",

abstract = "Zero-thermal-expansion (ZTE) alloys, as dimensionally stable materials, are urgently required in many fields, particularly in highly advanced modern industries. In this study, high-performance ZTE with a negligible coefficient of thermal expansion av as small as 2.4 ppm K−1 in a broad temperature range of 85–245 K is discovered in Hf0.85Ta0.15Fe2C0.01 magnet. It is demonstrated that the addition of trace interstitial atom C into Ta-substituted Hf0.85Ta0.15Fe2 exhibits significant capability to tune the normal positive thermal expansion into high-performance ZTE via enhanced magnetoelastic coupling in stabilized ferromagnetic structure. Moreover, direct observation of the magnetic transition between ferromagnetic and triangular antiferromagnetic states via Lorentz transmission electron microscopy, along with corresponding theoretical calculations, further uncovers the manipulation mechanism of ZTE and negative thermal expansion. A convenient and effective method to optimize thermal expansion and achieve ZTE with interstitial C addition may result in broadened applications based on the strong correlation between the magnetic properties and crystal structure.",

keywords = "kagome magnets, magnetic transition, magnetoelastic coupling, negative thermal expansion, zero thermal expansion",

author = "Jiawang Xu and Zhan Wang and He Huang and Zhuolin Li and Xiang Chi and Dingsong Wang and Jingyan Zhang and Xinqi Zheng and Jun Shen and Wenda Zhou and Yang Gao and Jianwang Cai and Tongyun Zhao and Shouguo Wang and Ying Zhang and Baogen Shen",

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year = "2023",

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doi = "10.1002/adma.202208635",

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T1 - Significant Zero Thermal Expansion Via Enhanced Magnetoelastic Coupling in Kagome Magnets

AU - Xu, Jiawang

AU - Wang, Zhan

AU - Huang, He

AU - Li, Zhuolin

AU - Chi, Xiang

AU - Wang, Dingsong

AU - Zhang, Jingyan

AU - Zheng, Xinqi

AU - Shen, Jun

AU - Zhou, Wenda

AU - Gao, Yang

AU - Cai, Jianwang

AU - Zhao, Tongyun

AU - Wang, Shouguo

AU - Zhang, Ying

AU - Shen, Baogen

PY - 2023/2/23

Y1 - 2023/2/23

N2 - Zero-thermal-expansion (ZTE) alloys, as dimensionally stable materials, are urgently required in many fields, particularly in highly advanced modern industries. In this study, high-performance ZTE with a negligible coefficient of thermal expansion av as small as 2.4 ppm K−1 in a broad temperature range of 85–245 K is discovered in Hf0.85Ta0.15Fe2C0.01 magnet. It is demonstrated that the addition of trace interstitial atom C into Ta-substituted Hf0.85Ta0.15Fe2 exhibits significant capability to tune the normal positive thermal expansion into high-performance ZTE via enhanced magnetoelastic coupling in stabilized ferromagnetic structure. Moreover, direct observation of the magnetic transition between ferromagnetic and triangular antiferromagnetic states via Lorentz transmission electron microscopy, along with corresponding theoretical calculations, further uncovers the manipulation mechanism of ZTE and negative thermal expansion. A convenient and effective method to optimize thermal expansion and achieve ZTE with interstitial C addition may result in broadened applications based on the strong correlation between the magnetic properties and crystal structure.

AB - Zero-thermal-expansion (ZTE) alloys, as dimensionally stable materials, are urgently required in many fields, particularly in highly advanced modern industries. In this study, high-performance ZTE with a negligible coefficient of thermal expansion av as small as 2.4 ppm K−1 in a broad temperature range of 85–245 K is discovered in Hf0.85Ta0.15Fe2C0.01 magnet. It is demonstrated that the addition of trace interstitial atom C into Ta-substituted Hf0.85Ta0.15Fe2 exhibits significant capability to tune the normal positive thermal expansion into high-performance ZTE via enhanced magnetoelastic coupling in stabilized ferromagnetic structure. Moreover, direct observation of the magnetic transition between ferromagnetic and triangular antiferromagnetic states via Lorentz transmission electron microscopy, along with corresponding theoretical calculations, further uncovers the manipulation mechanism of ZTE and negative thermal expansion. A convenient and effective method to optimize thermal expansion and achieve ZTE with interstitial C addition may result in broadened applications based on the strong correlation between the magnetic properties and crystal structure.

KW - kagome magnets

KW - magnetic transition

KW - magnetoelastic coupling

KW - negative thermal expansion

KW - zero thermal expansion

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DO - 10.1002/adma.202208635

M3 - Article

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VL - 35

JO - Advanced Materials

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ER -

Significant Zero Thermal Expansion Via Enhanced Magnetoelastic Coupling in Kagome Magnets

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