Solid–state synthesis of multicomponent equiatomic rare–earth oxides
Abstract
Phase formation in multicomponent rare–earth oxides is determined by a combination of composition, sintering atmosphere, and cooling rate. Polycrystalline ceramics comprising various combinations of Ce, Gd, La, Nd, Pr, Sm, and Y oxides in equiatomic proportions were synthesized using solid–state sintering. The effects of composition, sintering atmosphere, and cooling rate on phase formation were investigated. Single cubic or monoclinic structures were obtained with a slow cooling of 3.3°C/min, confirming that rare–earth oxides follow a different structure stabilization process than transition metal high–entropy oxides. In an oxidizing atmosphere, both Ce and Pr induce a cubic structure, while only Ce plays that role in an inert or reducing atmosphere. Samples without Ce or Pr develop a single monoclinic structure. The structures formed at initial synthesis may be converted to a different one, when the ceramics are annealed in an additional atmosphere. Phase evolution of a five–cation composition was also studied as a function of sintering temperature. In conclusion, the binary oxides used as raw materials completely dissolve into a single cubic structure at 1450°C in air.
- Authors:
-
[1];
[2];
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1606694
- Grant/Contract Number:
- AC05-00OR22725; DMR1846935
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 4; Journal ID: ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; phase transformations; rare earths; reaction sintering
Citation Formats
Pianassola, Matheus, Loveday, Madeline, McMurray, Jake W., Koschan, Merry, Melcher, Charles L., and Zhuravleva, Mariya. Solid–state synthesis of multicomponent equiatomic rare–earth oxides. United States: N. p., 2019.
Web. doi:10.1111/jace.16971.
Pianassola, Matheus, Loveday, Madeline, McMurray, Jake W., Koschan, Merry, Melcher, Charles L., & Zhuravleva, Mariya. Solid–state synthesis of multicomponent equiatomic rare–earth oxides. United States. https://doi.org/10.1111/jace.16971
Pianassola, Matheus, Loveday, Madeline, McMurray, Jake W., Koschan, Merry, Melcher, Charles L., and Zhuravleva, Mariya. Mon .
"Solid–state synthesis of multicomponent equiatomic rare–earth oxides". United States. https://doi.org/10.1111/jace.16971. https://www.osti.gov/servlets/purl/1606694.
@article{osti_1606694,
title = {Solid–state synthesis of multicomponent equiatomic rare–earth oxides},
author = {Pianassola, Matheus and Loveday, Madeline and McMurray, Jake W. and Koschan, Merry and Melcher, Charles L. and Zhuravleva, Mariya},
abstractNote = {Phase formation in multicomponent rare–earth oxides is determined by a combination of composition, sintering atmosphere, and cooling rate. Polycrystalline ceramics comprising various combinations of Ce, Gd, La, Nd, Pr, Sm, and Y oxides in equiatomic proportions were synthesized using solid–state sintering. The effects of composition, sintering atmosphere, and cooling rate on phase formation were investigated. Single cubic or monoclinic structures were obtained with a slow cooling of 3.3°C/min, confirming that rare–earth oxides follow a different structure stabilization process than transition metal high–entropy oxides. In an oxidizing atmosphere, both Ce and Pr induce a cubic structure, while only Ce plays that role in an inert or reducing atmosphere. Samples without Ce or Pr develop a single monoclinic structure. The structures formed at initial synthesis may be converted to a different one, when the ceramics are annealed in an additional atmosphere. Phase evolution of a five–cation composition was also studied as a function of sintering temperature. In conclusion, the binary oxides used as raw materials completely dissolve into a single cubic structure at 1450°C in air.},
doi = {10.1111/jace.16971},
journal = {Journal of the American Ceramic Society},
number = 4,
volume = 103,
place = {United States},
year = {2019},
month = {12}
}
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