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Title: Structure and Thermal Expansion of YSZ and La2Zr2O7 Above 1500°C from Neutron Diffraction on Levitated Samples

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.13767· OSTI ID:1361282
 [1];  [1];  [2];  [3]
  1. Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab.
  2. Materials Development, Inc., Arlington Heights, IL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
+ Show Author Affiliations

High‐temperature time‐of‐flight neutron diffraction experiments were performed on cubic yttria‐stabilized zirconia (YSZ, 10 mol% YO 1.5 ) and lanthanum zirconate (LZ) prepared by laser melting. Three spheroids of each composition were aerodynamically levitated and rotated in argon flow and heated with a CO 2 laser. Unit cell, positional and atomic displacement parameters were obtained by Rietveld analysis. Below ~1650°C the mean thermal expansion coefficient (TEC) for YSZ is higher than for LZ (13 ± 1 vs. 10.3 ± 0.6) × 10 −6 /K. From ~1650°C to the onset of melting of LZ at ~2250°C, TEC for YSZ and LZ are similar and within (7 ± 2) × 10 −6 /K. LZ retains the pyrochlore structure up to the melting temperature with Zr coordination becoming closer to perfectly octahedral. Congruently melting LZ is La deficient. The occurrence of thermal disordering of oxygen sublattice (Bredig transition) in defect fluorite structure was deduced from the rise in YSZ TEC to ~25 × 10 −6 /K at 2350°C–2550°C with oxygen displacement parameters ( U iso ) reaching 0.1 Å 2 , similar to behavior observed in UO 2 . Acquisition of powder‐like high‐temperature neutron diffraction data from solid‐levitated samples is feasible and possible improvements are outlined. This methodology should be applicable to a wide range of materials for high‐temperature applications.

Research Organization:
Univ. of California, Davis, CA (United States); Materials Development, Inc., Arlington Heights, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001089; SC0004684; AC05-00OR22725; DESC0001089; DE‐SC0004684
OSTI ID:
1361282
Alternate ID(s):
OSTI ID: 1400447
Journal Information:
Journal of the American Ceramic Society, Vol. 98, Issue 10; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (6)

Phase transformations in oxides above 2000°C: experimental technique development journal October 2018
Investigations of atomic disorder and grain growth kinetics in polycrystalline La2Zr2O7 journal May 2019
Temperature gradients for thermophysical and thermochemical property measurements to 3000 °C for an aerodynamically levitated spheroid journal January 2019
Probing disorder in pyrochlore oxides using in situ synchrotron diffraction from levitated solids–A thermodynamic perspective journal July 2018
In‐situ determination of the HfO 2 –Ta 2 O 5 ‐temperature phase diagram up to 3000°C journal January 2019
Combined computational and experimental investigation of high temperature thermodynamics and structure of cubic ZrO2 and HfO2 journal October 2018

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