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Title: In situ synchrotron diffraction of pressure-induced phase transition in DyPO 4 under variable hydrostaticity

Abstract

In situ synchrotron x-ray diffraction was conducted on polycrystalline DyPO4 to elucidate the details of the pressure-induced transition from the xenotime polymorph to the monazite polymorph. We used three different pressure-transmitting media (neon, a 16:3:1 methanol-ethanol-water mixture, and potassium chloride) to investigate the effect of hydrostaticity on the phase behavior. Specifically, our data clearly show a hydrostatic onset pressure of the xenotime-monazite transition of 9.1 GPa, considerably lower than the 15.3 GPa previously determined by Raman spectroscopy. Based on (quasi)hydrostatic data taken in a neon environment, third-order Birch-Murnaghan equation-of-state fits give a xenotime bulk modulus of 144 GPa and a monazite bulk modulus of 180 GPa (both with pressure derivatives of 4.0). Structural data and axial compressibilities show that DyPO4 is sensitive to shear and has an anisotropic response to pressure. More highly deviatoric conditions cause the onset of the transition to shift to pressures at least as low as 7.0 GPa. We attribute early transition to shear-induced distortion of the PO4 tetrahedra. Finally, our characterization of the high-pressure behavior of DyPO4 under variable hydrostaticity is critical for advancing rare earth orthophosphate fiber coating applications in ceramic matrix composites and may inform future tailoring of phase composition for controlled shearmore » and pressure applications.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [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 Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1784129
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 103; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Sharma, Jai, Musselman, Matthew, Haberl, Bianca, and Packard, Corinne E. In situ synchrotron diffraction of pressure-induced phase transition in DyPO 4 under variable hydrostaticity. United States: N. p., 2021. Web. doi:10.1103/physrevb.103.184105.
Sharma, Jai, Musselman, Matthew, Haberl, Bianca, & Packard, Corinne E. In situ synchrotron diffraction of pressure-induced phase transition in DyPO 4 under variable hydrostaticity. United States. https://doi.org/10.1103/physrevb.103.184105
Sharma, Jai, Musselman, Matthew, Haberl, Bianca, and Packard, Corinne E. Wed . "In situ synchrotron diffraction of pressure-induced phase transition in DyPO 4 under variable hydrostaticity". United States. https://doi.org/10.1103/physrevb.103.184105. https://www.osti.gov/servlets/purl/1784129.
@article{osti_1784129,
title = {In situ synchrotron diffraction of pressure-induced phase transition in DyPO 4 under variable hydrostaticity},
author = {Sharma, Jai and Musselman, Matthew and Haberl, Bianca and Packard, Corinne E.},
abstractNote = {In situ synchrotron x-ray diffraction was conducted on polycrystalline DyPO4 to elucidate the details of the pressure-induced transition from the xenotime polymorph to the monazite polymorph. We used three different pressure-transmitting media (neon, a 16:3:1 methanol-ethanol-water mixture, and potassium chloride) to investigate the effect of hydrostaticity on the phase behavior. Specifically, our data clearly show a hydrostatic onset pressure of the xenotime-monazite transition of 9.1 GPa, considerably lower than the 15.3 GPa previously determined by Raman spectroscopy. Based on (quasi)hydrostatic data taken in a neon environment, third-order Birch-Murnaghan equation-of-state fits give a xenotime bulk modulus of 144 GPa and a monazite bulk modulus of 180 GPa (both with pressure derivatives of 4.0). Structural data and axial compressibilities show that DyPO4 is sensitive to shear and has an anisotropic response to pressure. More highly deviatoric conditions cause the onset of the transition to shift to pressures at least as low as 7.0 GPa. We attribute early transition to shear-induced distortion of the PO4 tetrahedra. Finally, our characterization of the high-pressure behavior of DyPO4 under variable hydrostaticity is critical for advancing rare earth orthophosphate fiber coating applications in ceramic matrix composites and may inform future tailoring of phase composition for controlled shear and pressure applications.},
doi = {10.1103/physrevb.103.184105},
journal = {Physical Review B},
number = 18,
volume = 103,
place = {United States},
year = {Wed May 12 00:00:00 EDT 2021},
month = {Wed May 12 00:00:00 EDT 2021}
}

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