Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films

被引：3

作者：

Mentes, T. O. ^{[1
]}

Stojic, N. ^{[2
,3
]}

Vescovo, E. ^{[4
]}

Ablett, J. M. ^{[5
]}

Nino, M. A. ^{[6
]}

Locatelli, A. ^{[1
]}

机构：

[1] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy

[2] Abdus Salam Int Ctr Theoret Phys, Str Costiera 11, I-34014 Trieste, Italy

[3] IOM CNR Democritos, I-34151 Trieste, Italy

[4] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA

[5] Synchrotron Soleil, BP 48, F-91192 Gif Sur Yvette, France

[6] IMDEA Nanosci, Campus Univ Cantoblanco, Madrid 28049, Spain

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 08期

关键词：

NI; FE; DECOMPOSITION; TEMPERATURE; FE(110); W(110); MN;

D O I：

10.1103/PhysRevB.94.085402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The phase separation occurring in Fe-Ni thin films near the Invar composition is studied by using high-resolution spectromicroscopy techniques and density functional theory calculations. Annealed at temperatures around 300 degrees C, Fe0.70Ni0.30 films on W(110) break into micron-sized bcc and fcc domains with compositions in agreement with the bulk Fe-Ni phase diagram. Ni is found to be the diffusing species in forming the chemical heterogeneity. The experimentally determined energy barrier of 1.59 +/- 0.09 eV is identified as the vacancy formation energy via density functional theory calculations. Thus, the principal role of the surface in the phase separation process is attributed to vacancy creation without interstitials.

引用

页数：8

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