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Title: In-situ investigation of Hf6Ta2O17 anisotropic thermal expansion and topotactic, peritectic transformation

Journal Article · · Acta Materialia
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana, Champaign, IL (United States)
  2. Materials Development, Inc., Evanston, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
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The anisotropic coefficients of thermal expansion and the peritectic transformation of orthorhombic-Hf6Ta2O12 to tetragonal-HfO2 plus liquid at 2250 °C have been studied by in-situ X-ray powder diffraction from room temperature to complete melting (~2450 °C) in air, using a quadrupole lamp furnace (QLF) and a conical nozzle levitator (CNL) equipped with a CO2 laser. The topotactic, peritectic transformation has been fully described by extracting the orientation relationship, lattice variant deformation and a motif (grouping) of cations that relates the two structures at the transformation temperature. The calculation of these two important parameters as well as identification of the motif is facilitated by a knowledge of the anisotropic coefficients of thermal expansion as a function of temperature. In conclusion, symmetry decomposition has been performed to show that the orthorhombic-Hf6Ta2O12 and tetragonal-HfO2 structures are simply related by polyhedral rotations and loss of 1 mol of oxygen.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1505603
Alternate ID(s):
OSTI ID: 1703853
Journal Information:
Acta Materialia, Vol. 161, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (4)

In‐situ determination of the HfO 2 –Ta 2 O 5 ‐temperature phase diagram up to 3000°C journal January 2019
Reply to comments: “In‐situ determination of the HfO 2 ‐Ta 2 O 5 ‐temperature phase diagram up to 3000°C” journal May 2019
Temperature gradients for thermophysical and thermochemical property measurements to 3000 °C for an aerodynamically levitated spheroid journal January 2019
Synthesis and characterization of nanocrystalline Hf 6 Ta 2 O 17 ternary oxides by solvothermal method journal November 2019

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Related Subjects

36 MATERIALS SCIENCE
Crystalline oxides
In-situ high temperature X-ray diffraction
Phase transformations
Thermal expansion
X-ray synchrotron radiation