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Title: Structure and thermal expansion of Lu2O3 and Yb2O3 up to the melting points

Journal Article · · Journal of Nuclear Materials
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [3]
  1. Univ. of California, Davis, CA (United States). Peter A. Rock Thermochemistry Lab., NEAT ORU
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division; Materials Development Inc., Arlington Heights, IL (United States)

Knowledge of thermal expansion and high temperature phase transformations is essential for prediction and interpretation of materials behavior under the extreme conditions of high temperature and intense radiation encountered in nuclear reactors. We studied the structure and thermal expansion of Lu2O3 and Yb2O3 were studied in oxygen and argon atmospheres up to their melting temperatures using synchrotron X-ray diffraction on laser heated levitated samples. Both oxides retained the cubic bixbyite C-type structure in oxygen and argon to melting. In contrast to fluorite-type structures, the increase in the unit cell parameter of Yb2O3 and Lu2O33 with temperature is linear within experimental error from room temperature to the melting point, with mean thermal expansion coefficients (8.5 ± 0.6) · 10-6 K-1 and (7.7 ± 0.6) · 10-6 K-1, respectively. There is no indication of a superionic (Bredig) transition in the C-type structure or of a previously suggested Yb2O3 phase transformation to hexagonal phase prior to melting.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1506229; ACO2-06CH11357
OSTI ID:
1394832
Alternate ID(s):
OSTI ID: 1549895
Journal Information:
Journal of Nuclear Materials, Vol. 495, Issue C; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (4)

Probing disorder in pyrochlore oxides using in situ synchrotron diffraction from levitated solids–A thermodynamic perspective journal July 2018
Phonon variations in nano-crystalline lutetium sesquioxide under the influence of varying temperature and pressure journal December 2019
Combined computational and experimental investigation of high temperature thermodynamics and structure of cubic ZrO2 and HfO2 journal October 2018
Phase transformations in oxides above 2000°C: experimental technique development journal October 2018

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