Axis thermal expansion switching in transition-metal zirconides TrZr<sub>2</sub> by tuning the c/a ratio

Arima, Hironori; Kasem, Md. Riad; Mizuguchi, Yoshikazu

doi:10.35848/1882-0786/acc006

Cited by 3 publications

(2 citation statements)

References 26 publications

(28 reference statements)

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“…NiZr 2 exhibits PTE both along the a-and c-axes, and thus, the coefficient of volumetric thermal expansion 𝛽 is positive (Figure 1a). [19,20] In the tetragonal crystal structure, 𝛽 can be calculated according to the following equation:…”

Section: Thermal Expansion Under High Pressurementioning

confidence: 99%

“…[16][17][18] In the TrZr 2 system, we revealed that the uniaxial NTE along the c-axis can be controlled by the lattice constant ratio c/a, through chemical element substitution. [19,20] The sign of the linear coefficient of thermal expansion along the c-axis changes from positive to negative upon the substitution of Ni with Co at ambient pressure. [20] The anomalous bonding states related to the uniaxial NTE along the c-axis in TrZr 2 have also been observed using X-ray absorption spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Watanabe,

Arima,

Kawaguchi‐Imada

et al. 2024

Adv Elect Materials

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The study investigates the thermal expansion and superconducting properties of a CuAl2‐type (tetragonal) superconductor CoZr2 under high pressures. High‐pressure synchrotron X‐ray diffraction is performed in a pressure range of 2.9 GPa < P < 10.4 GPa, and it is discovered that CoZr2 exhibits volumetric negative thermal expansion (NTE) under high pressures. Although uniaxial positive thermal expansion (PTE) along the a‐axis is observed under ambient pressure, it is suppressed by pressure, whereas a large uniaxial NTE along the c‐axis is maintained under the pressure regime. Because of the combination of the suppressed uniaxial PTE along the a‐axis and uniaxial NTE along the c‐axis, volumetric NTE is achieved under high pressure in CoZr2. The volumetric NTE mechanism is based on the flexible crystal structure caused by the soft Co–Co bond, as observed in the isostructural compound FeZr2, which exhibits a uniaxial NTE along the c‐axis. High‐pressure electrical resistance measurements of CoZr2 are performed and confirm superconductivity at 0.03 GPa < P < 41.9 GPa. Because of the coexistence of the two phenomena, volumetric NTE and superconductivity, in CoZr2 under high pressure, coexistence can be achieved under ambient pressure by tuning the chemical composition after the present observation.

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Section: Thermal Expansion Under High Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Watanabe,

Arima,

Kawaguchi‐Imada

et al. 2024

Adv Elect Materials

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Giant uniaxial negative thermal expansion in FeZr2 alloy over a wide temperature range

Meng

Song

et al. 2023

Nat Commun

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Negative thermal expansion (NTE) alloys possess great practical merit as thermal offsets for positive thermal expansion due to its metallic properties. However, achieving a large NTE with a wide temperature range remains a great challenge. Herein, a metallic framework-like material FeZr2 is found to exhibit a giant uniaxial (1D) NTE with a wide temperature range (93-1078 K, $${\bar{\alpha }}_{l}=-34.01\times {10}^{-6}\,{{{{{{\rm{K}}}}}}}^{-1}$$ α ¯ l = − 34.01 × 10 − 6 K − 1 ). Such uniaxial NTE is the strongest in all metal-based NTE materials. The direct experimental evidence and DFT calculations reveal that the origin of giant NTE is the couple with phonons, flexible framework-like structure, and soft bonds. Interestingly, the present metallic FeZr2 excites giant 1D NTE mainly driven by high-frequency optical branches. It is unlike the NTE in traditional framework materials, which are generally dominated by low energy acoustic branches. In the present study, a giant uniaxial NTE alloy is reported, and the complex mechanism has been revealed. It is of great significance for understanding the nature of thermal expansion and guiding the regulation of thermal expansion.

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Uniaxial Negative Thermal Expansion in a Tetragonal V₃S-Type Superconductor IrZr₃

Mizuguchi

Yamashita

2023

J. Phys. Soc. Jpn.

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Axis thermal expansion switching in transition-metal zirconides TrZr₂ by tuning the c/a ratio

Cited by 3 publications

References 26 publications

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Giant uniaxial negative thermal expansion in FeZr2 alloy over a wide temperature range

Uniaxial Negative Thermal Expansion in a Tetragonal V₃S-Type Superconductor IrZr₃

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Axis thermal expansion switching in transition-metal zirconides TrZr2 by tuning the c/a ratio

Cited by 3 publications

References 26 publications

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr2 Superconductor

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr2 Superconductor

Giant uniaxial negative thermal expansion in FeZr2 alloy over a wide temperature range

Uniaxial Negative Thermal Expansion in a Tetragonal V3S-Type Superconductor IrZr3

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Axis thermal expansion switching in transition-metal zirconides TrZr₂ by tuning the c/a ratio

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr₂ Superconductor

Uniaxial Negative Thermal Expansion in a Tetragonal V₃S-Type Superconductor IrZr₃