Elongation of Fe-Fe atomic pairs in the Invar alloy 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mn>65</mml:mn></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mn>35</mml:mn></mml:msub></mml:mrow></mml:math>

Ishimatsu, Naoki; Iwasaki, Shingo; Kousa, M.; Kato, S.; Nakajima, N.; Kitamura, Naoto; Kawamura, N.; Mizumaki, Masaichiro; Kakizawa, Sho; Nomura, R.; Irifune, Tetsuo; Sumiya, Hitoshi

doi:10.1103/physrevb.103.l220102

Cited by 4 publications

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“…As the pressure increases, the shift of the g Fe-Fe (R) gradually decreases, and the g ij (R) profiles of Fe-Fe, Fe-Ni and Ni-Ni pairs are located at the same positions at pressures above 18.9 GPa. The elongation and pressure-induced shrinkage of the Fe-Fe pairs have also been observed in the g ij (R) profiles of Invar alloys (Ishimatsu et al, 2021). To investigate the elongation of the Fe-Fe atomic pairs quantitatively, average lengths of the 1NN atomic pairs, R Fe-Fe , R Fe-Ni , and R Ni-Ni were evaluated.…”

Section: Resultsmentioning

confidence: 95%

“…Disordered Fe 65 Ni 35 is a well-known Invar alloy that exhibits zero thermal expansion in a wide temperature range up to the Curie temperature, T C ≈ 505 K, at ambient pressure (Guillaume and Seances, 1897). We have previously examined the compressibility of Fe-Fe, Fe-Ni, and Ni-Ni atomic pairs in the Invar alloy using RMC calculations, revealing elongation of Fe-Fe atomic pairs compared with the other two atomic pairs (Ishimatsu et al, 2021). Because the elongation disappears with the pressure-induced transition to the paramagnetic phase, we concluded that the magnetovolume effect is due to the elongation of Fe-Fe atomic pairs.…”

Section: Introductionmentioning

confidence: 91%

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Visualization of the disordered structure of Fe-Ni Invar alloys by reverse monte carlo calculations

et al. 2022

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Reverse Monte Carlo (RMC) calculation was performed to visualize the atomic arrangement in a disordered Fe55Ni45 alloy, which is classified as an intermediate structure between the non-crystalline glass and crystalline structures. The optimized structure of the ferromagnetic phase at low pressures revealed that Fe and Ni atoms were displaced from a perfect fcc lattice to elongate the nearest neighboring Fe-Fe atomic pairs, therefore, Fe-Fe atomic pairs have longer bond length than Fe-Ni and Ni-Ni atomic pairs. Because the elongation becomes negligible during the pressure-induced destabilization of the ferromagnetic state, the elongation of Fe-Fe pairs is the atomic scale origin of the volume expansion due to a large magnetovolume effect. Compared with the atomic arrangement in the Fe65Ni35 Invar alloy, a relationship between Fe-Fe atomic pairs, the Invar effect and elastic anomalies in the compression curve is elucidated.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 91%