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Title: High-pressure behavior and thermoelastic properties of niobium studied by in situ x-ray diffraction

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4887436· OSTI ID:1466786
 [1];  [2];  [3];  [3];  [4];  [5];  [1]
  1. State University of New York, Stony Brook, NY (United States). Mineral Physics Institute
  2. State University of New York, Stony Brook, NY (United States). Department of Materials Science and Engineering
  3. State University of New York, Stony Brook, NY (United States). Department of Geosciences
  4. State University of New York, Stony Brook, NY (United States). Mineral Physics Institute; Jilin Normal University, Siping (China). Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
  5. State University of New York, Stony Brook, NY (United States). Department of Materials Science and Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
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In this study, in situ synchrotron energy dispersive x-ray diffraction (XRD) experiments on Nb have been conducted at pressures up to 6.4 GPa and temperatures up to 1073 K. From the pressure-volume-temperature measurements, thermoelastic parameters were derived for the first time for Nb based on the thermal pressure (ΔPth) equation of state (EOS), modified high-T Birch-Murnaghan EOS, and Mie-Grüneisen-Debye EOS. With the pressure derivative of the bulk modulus K'T fixed at 4.0, we obtained the ambient isothermal bulk modulus KT0 = 174(5) GPa, the temperature derivative of bulk modulus at constant pressure (∂KT/∂T)P=-0.060(8) GPa K-1 and at constant volume (∂KT/∂T)V=-0.046(8) GPa K-1, the volumetric thermal expansivity αT(T)=2.3(3)×10-5+0.3(2)×10-8T (K-1), as well as the pressure dependence of thermal expansion (∂α/∂P)T=(-2.0±0.4)×10-6 K-1 GPa-1. Fitting the present data to the Mie-Grüneisen-Debye EOS with Debye temperature Θ0 = 276.6 K gives γ0 = 1.27(8) and KT0 = 171(3) GPa at a fixed value of q = 3.0. The ambient isothermal bulk modulus and Grüneisen parameter derived from this work are comparable to previously reported values from both experimental and theoretical studies. Finally, an in situ high-resolution, angle dispersive XRD study on Nb did not indicate any anomalous behavior related to pressure-induced electronic topological transitions at ~5 GPa as has been reported previously.

Research Organization:
Stony Brook Univ., NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001815
OSTI ID:
1466786
Journal Information:
Journal of Applied Physics, Vol. 116, Issue 1; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (4)

Pressure-induced anomalies and structural instability in compressed β-Sb 2 O 3 journal January 2018
Thermoelasticity and anomalies in the pressure dependence of phonon velocities in niobium journal January 2018
Strong, Ductile, and Thermally Stable bcc-Mg Nanolaminates journal August 2017
Structure and properties of pseudomorphically transformed bcc Mg in Mg/Nb multilayered nanolaminates studied using synchrotron X-ray diffraction journal July 2019

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
niobium
thermoelasticity
pressure