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Title: In situ Raman spectroscopy of pressure-induced phase transformations in polycrystalline TbPO4, DyPO4, and GdxDy(1–x)PO4 [In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1–x)PO4]

Abstract

Xenotime DyPO4 and GdxDy(1–x)PO4 (x = 0.4, 0.5, 0.6) (tetragonal I41amd zircon structure) have been studied at ambient temperature under high pressures inside a diamond anvil cell with in situ Raman spectroscopy. The typical Raman–active modes of the xenotime structure were observed at low pressures and the appearance of new Raman peaks at higher pressures indicated a phase transformation to a lower symmetry structure—likely monoclinic. Raman mode softening was observed, resulting in a line crossing at approximately 7–8 GPa for each material and preceding the phase transformation. The onset of phase transformation for DyPO4 occurred at a pressure of 15.3 GPa. DyPO4 underwent a reversible phase transformation and returned to the xenotime phase after decompression. The transformation pressures of the solid solutions (GdxDy(1–x)PO4) were in the range 10–12 GPa. The GdxDy(1–x)PO4 solid solutions yielded partially reversible phase transformations, retaining some of the high–pressure phase spectrum while reforming xenotime peaks during decompression. The substitution of Gd into DyPO4 decreased the transformation pressure relative to pure DyPO4. In conclusion, the ability to modify the phase transformation pressures of xenotime rare–earth orthophosphates by chemical variations of solid solutions may provide additional methods to improve the performance of ceramic matrix composites.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [1]
  1. Colorado School of Mines, Golden, CO (United States)
  2. 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
OSTI Identifier:
1464024
Alternate Identifier(s):
OSTI ID: 1416390
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; phase transformations; phosphates; Raman spectroscopy; rare earths

Citation Formats

Musselman, Matthew A., Wilkinson, Taylor M., Haberl, Bianca, and Packard, Corinne E.. In situ Raman spectroscopy of pressure-induced phase transformations in polycrystalline TbPO4, DyPO4, and GdxDy(1–x)PO4 [In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1–x)PO4]. United States: N. p., 2017. Web. https://doi.org/10.1111/jace.15374.
Musselman, Matthew A., Wilkinson, Taylor M., Haberl, Bianca, & Packard, Corinne E.. In situ Raman spectroscopy of pressure-induced phase transformations in polycrystalline TbPO4, DyPO4, and GdxDy(1–x)PO4 [In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1–x)PO4]. United States. https://doi.org/10.1111/jace.15374
Musselman, Matthew A., Wilkinson, Taylor M., Haberl, Bianca, and Packard, Corinne E.. Fri . "In situ Raman spectroscopy of pressure-induced phase transformations in polycrystalline TbPO4, DyPO4, and GdxDy(1–x)PO4 [In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1–x)PO4]". United States. https://doi.org/10.1111/jace.15374. https://www.osti.gov/servlets/purl/1464024.
@article{osti_1464024,
title = {In situ Raman spectroscopy of pressure-induced phase transformations in polycrystalline TbPO4, DyPO4, and GdxDy(1–x)PO4 [In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1–x)PO4]},
author = {Musselman, Matthew A. and Wilkinson, Taylor M. and Haberl, Bianca and Packard, Corinne E.},
abstractNote = {Xenotime DyPO4 and GdxDy(1–x)PO4 (x = 0.4, 0.5, 0.6) (tetragonal I41amd zircon structure) have been studied at ambient temperature under high pressures inside a diamond anvil cell with in situ Raman spectroscopy. The typical Raman–active modes of the xenotime structure were observed at low pressures and the appearance of new Raman peaks at higher pressures indicated a phase transformation to a lower symmetry structure—likely monoclinic. Raman mode softening was observed, resulting in a line crossing at approximately 7–8 GPa for each material and preceding the phase transformation. The onset of phase transformation for DyPO4 occurred at a pressure of 15.3 GPa. DyPO4 underwent a reversible phase transformation and returned to the xenotime phase after decompression. The transformation pressures of the solid solutions (GdxDy(1–x)PO4) were in the range 10–12 GPa. The GdxDy(1–x)PO4 solid solutions yielded partially reversible phase transformations, retaining some of the high–pressure phase spectrum while reforming xenotime peaks during decompression. The substitution of Gd into DyPO4 decreased the transformation pressure relative to pure DyPO4. In conclusion, the ability to modify the phase transformation pressures of xenotime rare–earth orthophosphates by chemical variations of solid solutions may provide additional methods to improve the performance of ceramic matrix composites.},
doi = {10.1111/jace.15374},
journal = {Journal of the American Ceramic Society},
number = 6,
volume = 101,
place = {United States},
year = {2017},
month = {12}
}

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