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Revealing the Pressure-Induced Phase Transformation of Xenotime TbPO4 via In Situ Photoluminescence Spectroscopy

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    Physical Insights into Materials and Molecular Properties

    Revealing the Pressure-Induced Phase Transformation of Xenotime TbPO4 via In Situ Photoluminescence Spectroscopy
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2024, 15, 16, 4294–4300
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    https://doi.org/10.1021/acs.jpclett.4c00196
    Published April 15, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    The pressure-induced phase transformations of certain rare earth (RE) orthophosphates have attracted broad interest from geoscience to structural ceramics. Studying these transformations has required in situ Raman spectroscopy or synchrotron X-ray diffraction (XRD), each of which suffers from poor signal or limited accessibility, respectively. This study exploits the photoluminescence (PL) of Tb3+ ions and the unique sensitivity of PL to the local bonding environment to interrogate the symmetry-reducing xenotime–monazite phase transformation of TbPO4. At pressures consistent with the XRD-based phase transformation onset pressure of 8.7(6) GPa, PL spectra show new peaks emerging as well as trend changes in the centroids and intensity ratios of certain PL bands. Furthermore, PL spectra of recovered samples show transformation is irreversible. Hysteresis in certain PL band intensity ratios also reveals the stress history in TbPO4. This in situ PL approach can be applied to probe pressure-induced transformations and crystal field distortions in other RE-based oxide compounds.

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    • Additional details about sample synthesis, phase purity, powder morphology, PL measurement, a table showing experimental specific details, and additional figures showing band 4 fwhm data, stacked PL spectra from Exp. 3–Exp. 5, pressure evolution of other centroids (bands 1, 3, and 4) and other BIRs (3:1, 1:4, and 2:4), and loading rates from all experiments (PDF)

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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2024, 15, 16, 4294–4300
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpclett.4c00196
    Published April 15, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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