Temperature‐dependent local atomic structures in the traditional Fe65Ni35 Invar alloy by X‐ray fluorescence holography. (22nd June 2018)

• Record Type: Journal Article
• Authors: Stellhorn, Jens Rüdiger; Ideguchi, Yuuki; Hosokawa, Shinya; Happo, Naohisa; Matsushita, Tomohiro; Yubuta, Kunio; Suzuki, Motohiro; Ishii, Hirofumi; Liao, Yen‐Fa; Kimura, Koji; Hayashi, Kouichi
• Is Part Of: Surface and interface analysis. Volume 50:Number 8(2018)
• Page Start: 790
• Page End: 794
• Publication Date: 2018-06-22
• Subjects: element selective -- imaging -- holography -- Invar alloy -- local structure; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Thin films -- Periodicals; 541.33
• DOI: 10.1002/sia.6474
• Languages: English
• ISSNs: 0142-2421

Abstract

Abstract : Fe and Ni K α X‐ray fluorescence holography measurements were conducted on a single crystal Fe65 Ni35 Invar alloy at 100 and 300 K to investigate the temperature dependence of the 3‐dimensional local structures around the Fe and Ni atoms, respectively. Local structural information was obtained by detailed analyses using a L 1 ‐regularized linear regression for the experimental data. At 100 K, the local atomic arrangements around both the elements show f c c structures. At 300 K, however, only the image around Fe shows a b c c ‐like neighboring arrangement. From these X‐ray fluorescence holography data, we propose a model that with increasing temperature, an Fe atom with the low‐spin state enters at the central position of the f c c lattice and is stabilized. And then, large angular positional fluctuations are induced for the atoms at the face‐centered positions around the central Fe atom only.