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Title: Pressure-induced structures of Si-doped HfO2

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4922717· OSTI ID:1186933
ORCiD logo [1];  [2];  [1];  [3];  [3];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. North Carolina State Univ., Raleigh, NC (United States); Northwest Univ., Xi’an (China)
  3. Carnegie Inst. of Washington, Argonne, IL (United States). HPCAT, Geophysical Lab.

In this work, the effect of hydrostatic pressure on the structure of Si-doped HfO2 (Si:HfO2) was studied by using a diamond anvil cell in combination with high-energy X-ray diffraction at a synchrotron source. Diffraction data were measured in situ during compression up to pressures of 31 GPa. Si:HfO2 with 3, 5, and 9 at.% Si were found to undergo a monoclinic to orthorhombic transition at pressures between 7 and 15 GPa. Whole pattern analysis was carried out using nonpolar (Pbca) and polar (Pca21) crystallographic models to investigate the symmetry of the observed high-pressure orthorhombic phase. Rietveld refinement results cannot discriminate a reliable difference between the Pbca and Pca21 structures as they nearly equally model the measured diffraction data. The pressure dependent lattice parameters, relative volume, and spontaneous strain are reported.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
NA0001974; FG02-99ER45775; AC02-06CH11357
OSTI ID:
1186933
Alternate ID(s):
OSTI ID: 1228275
Journal Information:
Journal of Applied Physics, Vol. 117, Issue 23; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (3)

Stability of monoclinic phase in pure and Gd-doped HfO2: a hyperfine interaction study journal July 2019
Stabilization of metastable phases in hafnia owing to surface energy effects journal April 2016
Structure of HfO 2 modified with Y, Gd, and Zr at ambient conditions and high pressures journal November 2019

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