Inter-element miscibility driven stabilization of ordered pseudo-binary alloy

Kenshi Matsumoto, Ryota Sato, Yasutomi Tatetsu, Ryo Takahata, Seiji Yamazoe, Miho Yamauchi, Yuji Inagaki, Yoichi Horibe, Masaki Kudo, Takaaki Toriyama, Mitsunari Auchi, Mitsutaka Haruta, Hiroki Kurata and Toshiharu Teranishi ()
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Kenshi Matsumoto: Kyoto University, Gokasho, Uji
Ryota Sato: Kyoto University, Gokasho, Uji
Yasutomi Tatetsu: Meio University, Biimata, Nago
Ryo Takahata: Kyoto University, Gokasho, Uji
Seiji Yamazoe: Tokyo Metropolitan University
Miho Yamauchi: Kyushu University
Yuji Inagaki: Kyushu University
Yoichi Horibe: Kyushu Institute of Technology
Masaki Kudo: Kyushu University
Takaaki Toriyama: Kyushu University
Mitsunari Auchi: Kyushu University
Mitsutaka Haruta: Kyoto University, Gokasho, Uji
Hiroki Kurata: Kyoto University, Gokasho, Uji
Toshiharu Teranishi: Kyoto University, Gokasho, Uji

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract An infinite number of crystal structures in a multicomponent alloy with a specific atomic ratio can be devised, although only thermodynamically-stable phases can be formed. Here, we experimentally show the first example of a layer-structured pseudo-binary alloy, theoretically called Z3-FePd3. This Z3 structure is achieved by adding a small amount of In, which is immiscible with Fe but miscible with Pd and consists of an alternate L10 (CuAu-type)-PdFePd trilayer and Pd–In ordered alloy monolayer along the c axis. First-principles calculations strongly support that the specific inter-element miscibility of In atoms stabilizes the thermodynamically-unstable Z3-FePd3 phase without significantly changing the original density of states of the Z3-FePd3 phase. Our results demonstrate that the specific inter-element miscibility can switch stable structures and manipulate the material nature with a slight composition change.

Date: 2022
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DOI: 10.1038/s41467-022-28710-0

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