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Title: X-ray absorption investigation of local structural disorder in Ni 1-x Fe x (x=0.10, 0.20, 0.35, and 0.50) alloys

Authors:
; ; ; ORCiD logo; ORCiD logo; ; ; ORCiD logo; ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1357631
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 121; Journal Issue: 16
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Zhang, F. X., Jin, K., Zhao, Shijun, Mu, S., Bei, Hongbin, Liu, J. C., Xue, H. Z., Popov, D., Park, Changyong, Stocks, G. M., Weber, William J., and Zhang, Yanwen. X-ray absorption investigation of local structural disorder in Ni 1-x Fe x (x=0.10, 0.20, 0.35, and 0.50) alloys. United States: N. p., 2017. Web. doi:10.1063/1.4982705.
Zhang, F. X., Jin, K., Zhao, Shijun, Mu, S., Bei, Hongbin, Liu, J. C., Xue, H. Z., Popov, D., Park, Changyong, Stocks, G. M., Weber, William J., & Zhang, Yanwen. X-ray absorption investigation of local structural disorder in Ni 1-x Fe x (x=0.10, 0.20, 0.35, and 0.50) alloys. United States. doi:10.1063/1.4982705.
Zhang, F. X., Jin, K., Zhao, Shijun, Mu, S., Bei, Hongbin, Liu, J. C., Xue, H. Z., Popov, D., Park, Changyong, Stocks, G. M., Weber, William J., and Zhang, Yanwen. 2017. "X-ray absorption investigation of local structural disorder in Ni 1-x Fe x (x=0.10, 0.20, 0.35, and 0.50) alloys". United States. doi:10.1063/1.4982705.
@article{osti_1357631,
title = {X-ray absorption investigation of local structural disorder in Ni 1-x Fe x (x=0.10, 0.20, 0.35, and 0.50) alloys},
author = {Zhang, F. X. and Jin, K. and Zhao, Shijun and Mu, S. and Bei, Hongbin and Liu, J. C. and Xue, H. Z. and Popov, D. and Park, Changyong and Stocks, G. M. and Weber, William J. and Zhang, Yanwen},
abstractNote = {},
doi = {10.1063/1.4982705},
journal = {Journal of Applied Physics},
number = 16,
volume = 121,
place = {United States},
year = 2017,
month = 4
}
  • Defect energetics in structural materials has long been recognized to be affected by specific alloy compositions. Significantly enhanced radiation resistance has recently been observed in concentrated solid-solution alloys. However, the link between local structural disorder and modified defect dynamics in solid solutions remains unclear. To reveal the atomic-level lattice distortion, the local structures of Ni and Fe in Ni 1-xFe x (x=0.1, 0.2, 0.35 and 0.5) solid solution alloys were measured with extended X-ray absorption fine structure (EXAFS) technique. The lattice constant and the first-neighbor distances increase with the increase of Fe content in the solid solutions. EXAFS measurements havemore » revealed that the bond length of Fe with surrounding atoms is 0.01-0.03 larger than that of Ni in the alloy systems. Debye-Waller factor of the Fe-Fe bonds in all the systems is also slightly larger than that of the Ni-Ni bond. EXAFS fitting suggests that the local structural disorder is enhanced with the addition of Fe elements in the solid solution. The local bonding environments from ab initio calculation are in good agreement with the experimental results, which suggest that the Fe has a larger first-neighbor bonding distance than that of Ni, and thus Ni atom inside the Ni-Fe solid solution alloys undergoes compressive strain.« less
  • The influence of barium content on the structural characteristics, sinterability and electrical conductivity of proton conductor Ba{sub x}Ce{sub 0.50}Zr{sub 0.40}Y{sub 0.10}O{sub 3-{delta}} (x = 0.95, 0.97, 1.00, 1.03, 1.05) is investigated. Compositions with barium deficiency show the presence of fluorite precipitate detected by powder X-ray diffraction, whilst pure perovskite phase is present for other samples. Barium deficiency promotes the densification process of the samples. The electrical conductivity of Ba{sub x}Ce{sub 0.50}Zr{sub 0.40}Y{sub 0.10}O{sub 3-{delta}} increases with barium content, which is mainly ascribed to the decreased activation energy due to the increasing lattice volume, especially for the case in wet 5%more » H{sub 2}/Ar. The present results suggest that it is very important to control the stoichiometry of cations to obtain desirable perovskite type high temperature proton conductors.« less
  • Graphical abstract: The Cr{sub x}Ce{sub 1−x}PO{sub 4} (x = 0.00, 0.08, 0.10 and 0.20) nanorods synthesized under hydrothermal conditions. - Highlights: • Cr{sub x}Ce{sub 1−x}PO{sub 4} (x = 0.00–0.20) nanorods were synthesized by hydrothermal method. • Mean crystallite size of the products decreases with Cr-content. • Obvious improvements of the electrical conductivity comparatively to CePO4. - Abstract: Cr{sub x}Ce{sub 1−x}PO{sub 4} (x = 0.00–0.20) nanorods were synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), infrared absorption spectroscopy (IR) and transmission electron microscopy (TEM). The XRD results revealed the formation of a pure CePO{sub 4}more » hexagonal phase. TEM images confirmed the nano-size character of the as-prepared samples. Impedance spectroscopy analysis was used to analyze the electrical behavior of samples as a function of frequency at different temperatures. The increase of Cr-amount led to an increase in the total conductivities and decreased the activation energies (E{sub a} (x = 0.00) = 1.08 eV to E{sub a} (x = 0.20) = 0.80 eV). The optical properties of Cr{sub x}Ce{sub 1−x}PO{sub 4} nanomaterials were investigated using UV–vis spectroscopy. The band-gap energy values decreased with increasing Cr-content showing a red-shift trend. The improvement of the electrical conductivity and optical properties makes the Cr{sub x}Ce{sub 1−x}PO{sub 4} nanomaterials possible candidates to be used as electrolytes in solid oxide fuel cells, in photocatalytic and photovoltaic applications.« less
  • Structural and dielectric properties of polycrystalline YMnO{sub 3} (x = 0.0, 0.10 and 0.20) which was prepared by solid-state reaction route, have been investigated. The X-ray diffraction pattern reveals that all the samples are in single phase and show hexagonal structure with P63cm space group. The particle size decreases with increase in Sm doping while to that X-ray density increases with increasing x. The dielectric constant (ε’) of Y{sub 1-x}Sm{sub x}MnO{sub 3} measured in the frequency range 10 Hz to 1MHz is much higher at lower frequencies (≤ 1KHz) and its value decreases with enhanced frequency. At very high frequencies, ε’more » becomes frequency independent and is attributed to Maxwell Wagner type of interfacial polarization model. A very high value of dielectric constant ∼18642 is observed for x = 10%. The dielectric loss (tan δ) decreases wit increase in Sm doping.« less