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Title: The Structure of Liquid and Amorphous Hafnia

Journal Article · · Materials
DOI:https://doi.org/10.3390/ma10111290· OSTI ID:1422595
 [1];  [2];  [1];  [1];  [3];  [3];  [2];  [4];  [5];  [6];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Leadership Computing Facility
  3. Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab. NEAT ORU
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Global Security Sciences
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Computing, Environment and Life Sciences

Understanding the atomic structure of amorphous solids is important in predicting and tuning their macroscopic behavior. Here, we use a combination of high-energy X-ray diffraction, neutron diffraction, and molecular dynamics simulations to benchmark the atomic interactions in the high temperature stable liquid and low-density amorphous solid states of hafnia. The diffraction results reveal an average Hf–O coordination number of ~7 exists in both the liquid and amorphous nanoparticle forms studied. The measured pair distribution functions are compared to those generated from several simulation models in the literature. We have also performed ab initio and classical molecular dynamics simulations that show density has a strong effect on the polyhedral connectivity. The liquid shows a broad distribution of Hf–Hf interactions, while the formation of low-density amorphous nanoclusters can reproduce the sharp split peak in the Hf–Hf partial pair distribution function observed in experiment. The agglomeration of amorphous nanoparticles condensed from the gas phase is associated with the formation of both edge-sharing and corner-sharing HfO6,7 polyhedra resembling that observed in the monoclinic phase.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); ANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; 1506229
OSTI ID:
1422595
Journal Information:
Materials, Vol. 10, Issue 11; ISSN 1996-1944
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (6)

Combined computational and experimental investigation of high temperature thermodynamics and structure of cubic ZrO2 and HfO2 journal October 2018
Temperature gradients for thermophysical and thermochemical property measurements to 3000 °C for an aerodynamically levitated spheroid journal January 2019
Intrinsic charge trapping in amorphous oxide films: status and challenges journal May 2018
Characterizing the Charge Trapping across Crystalline and Amorphous Si/SiO 2 /HfO 2 Stacks from First-Principle Calculations journal December 2019
Amorphous tantala and its relationship with the molten state journal April 2018
In‐situ determination of the HfO 2 –Ta 2 O 5 ‐temperature phase diagram up to 3000°C journal January 2019

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