skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation in Ni-Pt multilayers [X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation]

Abstract

An in situ optical pump and x-ray probe technique has been utilized to study photoinitiated solid-state diffusion in a Ni-Pt multilayer system. Hard x-ray diffraction has been used to follow the systematic growth of the NiPt alloy as a function of laser intensity and total energy deposited. It is observed that new phase growth can be driven in as little as one laser pulse, and that repeated photoexcitation can completely convert the entire multilayer structure into a single metallic alloy. In conclusion, the data suggest that lattice strain relaxation takes place prior to atomic diffusion and the formation of a NiPt alloy.

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); National Institutes of Health (NIH), National Institute of General Medical Sciences
OSTI Identifier:
1372088
Alternate Identifier(s):
OSTI ID: 1342442
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kelly, B. G., Loether, A., Unruh, K. M., DeCamp, M. F., and DiChiara, A. D. X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation in Ni-Pt multilayers [X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation]. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.064301.
Kelly, B. G., Loether, A., Unruh, K. M., DeCamp, M. F., & DiChiara, A. D. X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation in Ni-Pt multilayers [X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation]. United States. doi:10.1103/PhysRevB.95.064301.
Kelly, B. G., Loether, A., Unruh, K. M., DeCamp, M. F., and DiChiara, A. D. Wed . "X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation in Ni-Pt multilayers [X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation]". United States. doi:10.1103/PhysRevB.95.064301. https://www.osti.gov/servlets/purl/1372088.
@article{osti_1372088,
title = {X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation in Ni-Pt multilayers [X-ray diffraction study of laser-driven solid-state diffusional mixing and new phase formation]},
author = {Kelly, B. G. and Loether, A. and Unruh, K. M. and DeCamp, M. F. and DiChiara, A. D.},
abstractNote = {An in situ optical pump and x-ray probe technique has been utilized to study photoinitiated solid-state diffusion in a Ni-Pt multilayer system. Hard x-ray diffraction has been used to follow the systematic growth of the NiPt alloy as a function of laser intensity and total energy deposited. It is observed that new phase growth can be driven in as little as one laser pulse, and that repeated photoexcitation can completely convert the entire multilayer structure into a single metallic alloy. In conclusion, the data suggest that lattice strain relaxation takes place prior to atomic diffusion and the formation of a NiPt alloy.},
doi = {10.1103/PhysRevB.95.064301},
journal = {Physical Review B},
number = 6,
volume = 95,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:
  • The present study deals with the analysis of elastic strains and stresses in high-quality heteroepitaxial Mo/Ni superlattices with periods {Lambda} lying in the range 4.8-27.6 nm. The strain-stress state in this lattice-mismatched system grown under energetic deposition conditions (ion beam sputtering) is rather complex, resulting from three contributions: (i) intrinsic (growth) stress due to atomic peening, (ii) coherency stresses of opposite sign in the two elemental layers due to the observed Nishiyama-Wassermann epitaxial relationship Ni[110](111)||Mo[001](110), and (iii) interfacial mixing. The measurement of the lattice parameters of Mo and Ni sublayers in various crystallographic directions was performed by x-ray diffraction, usingmore » the sin{sup 2} {psi} method adapted for epitaxial layers. A large anisotropy of elastic strain and associated in-plane coherency stresses is revealed in the Mo sublayers, while for Ni sublayers no such behavior could be detected due to the superimposition of growth variants with threefold symmetry. Postgrowth ion irradiation with Ar ions at very low dose ({approx}0.2 dpa) was employed as a powerful tool to modify the intrinsic stress, thus providing additional data to be implemented in a triaxial strain-stress model, which enabled us to separate the different stress sources (intrinsic and coherency stresses) as well as to quantify the intermixing occurring during growth. This model, which has been successfully applied previously to Mo thin films, yields in the case of multilayer systems to the determination of the ''stress-free and defect-free'' lattice parameter, a{sub 0}, i.e., solely linked to chemical mixing. The linear dependence of a{sub 0} with {Lambda} observed in both sublayers reveals an interface-mediated chemical mixing mechanism, the extent of this interfacial mixing being much more pronounced in Mo sublayers than in Ni ones.« less
  • Taking advantage of the high sensitivity of the Ce valence to the local environment, we investigated the early stage of the solid-state reaction in Ce/Ni multilayers through x-ray absorption spectroscopy. Ce L/sub III/-edge and Ni K-edge spectra have been compared to distributions of experimental spectra obtained from amorphous Ce-Ni alloys. Two possible diffusion profiles have been examined. It is found that the experimental data are compatible with the formation of a homogeneous amorphous-alloy interlayer instead of a Fickian profile.
  • Phase separation in artificially stacked multilayers of isolated bovine retinal rod outer segment (ROS) membranes has been examined via x-ray diffraction and electron microscopy. Specimens were prepared by isopotential spin drying followed with partial hydration by equilibration against moist gas streams. Upon dehydration, the multilamellar membrane phase assumes a binary phase composition consisting of concentrated protein-containing lamellae interspersed with microdomains of hexagonally packed tubes of lipid in a H/sub II/ configuration. The H/sub II/ lattice is geometrically coupled to the lamellar phase with one set of hexagonal crystal planes co-planar to the local membrane lamellae. The hexagonal microdomains bear amore » striking resemblance to the ''paracrystalline inclusions'' observed in fast-frozen, intact frog ROS (Corless and Costello, 1981. Exp. Eye Res. 32:217). The lamellar lattice is characterized by an unusually small degree of disorder. Sharp lamellar diffraction with a 120 angstrom unit cell is observed (at near total dehydration) to a resolution of 6 angstrom. A model consistent with the data is that a multilamellar array of ROS disks is stable as long as the external disk surfaces are kept sufficiently far apart. If the distance between the membranes is allowed to shrink below a certain critical value, the disk lipids, spontaneously convert to a nonbilayer phase. This suggests that the structure of the ROS is stabilized by an internal framework that acts to keep the disks apart from one another and from the plasmalemma. Thus, necessity of avoiding phase separations may provide a rationale for the peculiar morphology of the ROS.« less
  • Changes in Pt-Sn-alumina catalysts, prepared from the (Pt/sub 3/Sn/sub 8/Cl/sub 20/)/sup 2 -/ complex, during reduction in flowing hydrogen were followed by in situ x-ray diffraction (XRD). For high metal loading (ca. 5% Pt) evidence was found for both Pt-Sn and Pt phases: other Pt-Sn phases, such as Pt/sub 3/Sn. PtSn/sub 2/, and PtSn/sub 4/, were not observed. Metallic Pt was detected for a 0.6 wt% Pt-Al/sub 2/O/sub 3/ catalyst but only a Pt-Sn alloy was observed for a 0.6 wt% Pt catalyst containing Sn. In situ XRD studies therefore support alloy formation with a stoichiometry of Pt:Sn = 1:1;more » the Sn in excess of that needed to form this alloy is present in an X-ray amorphous form. 42 references.« less