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Title: In Situ Determination of the HfO2-Ta2O5-Temperature Phase Diagram up to 3000 °C

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.16271· OSTI ID:1598613
ORCiD logo [1];  [1];  [2];  [3];  [3]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
  2. Materials Development, Inc., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab.

The previously unknown experimental HfO2-Ta2O5-temperature phase diagram has been elucidated up to 3000 degrees C using a quadrupole lamp furnace and conical nozzle levitator system equipped with a CO2 laser, in conjunction with synchrotron X-ray diffraction. These in-situ techniques allowed the determination of the following: (a) liquidus, solidus, and invariant transformation temperatures as a function of composition from thermal arrest experiments, (b) determination of equilibrium phases through testing of reversibility via in-situ X-ray diffraction, and (c) molar volume measurements as a function of temperature for equilibrium phases. From these, an experimental HfO2-Ta2O5-temperature phase diagram has been constructed which is consistent with the Gibbs Phase Rule.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1598613
Journal Information:
Journal of the American Ceramic Society, Vol. 102, Issue 8; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Synthesis and characterization of nanocrystalline Hf 6 Ta 2 O 17 ternary oxides by solvothermal method journal November 2019
High‐temperature oxidation behavior of (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )C high‐entropy ceramics in air journal August 2019