Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

Matheus Pianassola; Kaden L. Anderson; Joshua Safin; Can Agca; Jake W. McMurray; Bryan C. Chakoumakos; Jöerg C. Neuefeind; Charles L. Melcher; Mariya Zhuravleva

doi:10.1007/s40145-022-0625-z

Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

Matheus Pianassola, Kaden L. Anderson, Joshua Safin, Can Agca, Jake W. McMurray, Bryan C. Chakoumakos, Jöerg C. Neuefeind, Charles L. Melcher, Mariya Zhuravleva

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6 Scopus citations

Abstract

The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)₂O₃ maintains a cubic C-type structure upon cooling from the melt, as observed via in-situ high-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)₂O₃ crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)₂O₃ and (Lu,Y,Gd,Nd,La)₂O₃ were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)₂O₃ did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition. [Figure not available: see fulltext.].

Original language	English
Pages (from-to)	1479-1490
Number of pages	12
Journal	Journal of Advanced Ceramics
Volume	11
Issue number	9
DOIs	https://doi.org/10.1007/s40145-022-0625-z
State	Published - Sep 2022

Funding

This work was supported by the National Science Foundation (DMR 1846935). The authors are grateful for the support from the Center for Materials Processing, The University of Tennessee. The powder XRD was performed at the Institute for Advanced Materials & Manufacturing Diffraction Facility, The University of Tennessee, Knoxville. The electron microprobe measurements were performed at the Electron Microprobe Laboratory in the Department of Earth and Planetary Sciences, The University of Tennessee, Knoxville, with the assistance of Molly MCCANTA and Allan PATCHEN. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Keywords

crystal growth
crystallography
high-entropy oxides
neutron diffraction

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10.1007/s40145-022-0625-z

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title = "Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt",

abstract = "The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)2O3 maintains a cubic C-type structure upon cooling from the melt, as observed via in-situ high-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)2O3 crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)2O3 and (Lu,Y,Gd,Nd,La)2O3 were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)2O3 did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition. [Figure not available: see fulltext.].",

keywords = "crystal growth, crystallography, high-entropy oxides, neutron diffraction",

author = "Matheus Pianassola and Anderson, {Kaden L.} and Joshua Safin and Can Agca and McMurray, {Jake W.} and Chakoumakos, {Bryan C.} and Neuefeind, {J{\"o}erg C.} and Melcher, {Charles L.} and Mariya Zhuravleva",

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year = "2022",

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doi = "10.1007/s40145-022-0625-z",

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T1 - Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

AU - Pianassola, Matheus

AU - Anderson, Kaden L.

AU - Safin, Joshua

AU - Agca, Can

AU - McMurray, Jake W.

AU - Chakoumakos, Bryan C.

AU - Neuefeind, Jöerg C.

AU - Melcher, Charles L.

AU - Zhuravleva, Mariya

PY - 2022/9

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N2 - The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)2O3 maintains a cubic C-type structure upon cooling from the melt, as observed via in-situ high-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)2O3 crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)2O3 and (Lu,Y,Gd,Nd,La)2O3 were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)2O3 did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition. [Figure not available: see fulltext.].

AB - The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)2O3 maintains a cubic C-type structure upon cooling from the melt, as observed via in-situ high-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)2O3 crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)2O3 and (Lu,Y,Gd,Nd,La)2O3 were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)2O3 did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition. [Figure not available: see fulltext.].

KW - crystal growth

KW - crystallography

KW - high-entropy oxides

KW - neutron diffraction

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Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

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