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

Abstract

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.

Authors:
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)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1394832
Alternate Identifier(s):
OSTI ID: 1549895
Grant/Contract Number:  
AC02-06CH11357; DMR-1506229; ACO2-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 495; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pavlik, Alfred, Ushakov, Sergey V., Navrotsky, Alexandra, Benmore, Chris J., and Weber, Richard J. K. Structure and thermal expansion of Lu2O3 and Yb2O3 up to the melting points. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.08.031.
Pavlik, Alfred, Ushakov, Sergey V., Navrotsky, Alexandra, Benmore, Chris J., & Weber, Richard J. K. Structure and thermal expansion of Lu2O3 and Yb2O3 up to the melting points. United States. https://doi.org/10.1016/j.jnucmat.2017.08.031
Pavlik, Alfred, Ushakov, Sergey V., Navrotsky, Alexandra, Benmore, Chris J., and Weber, Richard J. K. Thu . "Structure and thermal expansion of Lu2O3 and Yb2O3 up to the melting points". United States. https://doi.org/10.1016/j.jnucmat.2017.08.031. https://www.osti.gov/servlets/purl/1394832.
@article{osti_1394832,
title = {Structure and thermal expansion of Lu2O3 and Yb2O3 up to the melting points},
author = {Pavlik, Alfred and Ushakov, Sergey V. and Navrotsky, Alexandra and Benmore, Chris J. and Weber, Richard J. K.},
abstractNote = {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.},
doi = {10.1016/j.jnucmat.2017.08.031},
journal = {Journal of Nuclear Materials},
number = C,
volume = 495,
place = {United States},
year = {Thu Aug 24 00:00:00 EDT 2017},
month = {Thu Aug 24 00:00:00 EDT 2017}
}

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Cited by: 26 works
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