Raman study of zircon-structured RPO<sub>4</sub>(R = Y, Tb, Er, Tm) phosphates at high pressures

Stavrou, Elissaios; Tatsi, A.; Salpea, E; Boulmetis, Y. C.; Kontos, A. G.; Raptis, Y. S.; Raptis, Constantine A.

doi:10.1088/1742-6596/121/4/042016

Cited by 18 publications

(18 citation statements)

References 19 publications

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“…Xenotime DyPO 4 also matched the Raman spectra reported by Kontos et al . The eight Raman modes and relative intensities previously reported for all other xenotime REPO 4 s were observed in the initial Raman spectra of the Gd x Dy (1− x ) PO 4 solid solutions . The observed ambient mode frequencies (ω 0 ) from this study are shown in Table and are compared to the xenotime TbPO 4 results and mode assignments reported by Tatsi et al.…”

Section: Resultssupporting

confidence: 88%

“…The formation of the A g (~1033 cm −1 ) monazite mode that coincides with the elimination of the A 1 g (~995 cm −1 ) xenotime mode is the strongest indication of this transformation. In addition, the common emergence of peaks at ~290 cm −1 , ~455 cm −1 , ~480 cm −1 , and ~560 cm −1 agrees with prominent monazite modes observed under high‐pressure Raman spectroscopy . It should be noted, however, that the quantity of observed high‐pressure modes varied between experiments due to increased background and overlapping of spectra.…”

Section: Resultssupporting

confidence: 76%

“…Characterization of these high‐pressure REPO 4 phases is not only important for such engineering applications but also for the understanding of historical geological conditions during the formation of the Earth's crust . REPO 4 s have been studied under high pressure by Raman spectroscopy, X‐ray and neutron diffraction, and theoretical calculations . Phase transformations are reported for all elemental lanthanide xenotimes from Tb to Tm, with the exception of Dy, from diamond anvil cell (DAC) experiments.…”

Section: Introductionmentioning

confidence: 99%

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In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄

et al. 2018

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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. 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.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄

et al. 2018

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“…Various studies on the effects of pressure on the crystallization of phosphates [2][3][4]26,27] have determined that the main peaks in the Raman spectra are displaced to higher values as pressure increases. If we analyze the obtained Raman spectra focusing only on peak position, we can observe a certain degree of variability ( Figure 8A,B).…”

Section: Discussionmentioning

confidence: 99%

“…It is possible that these two different spectra were caused by two different structural merrillites. The structural differences can be caused by partial substitutions in the mineral structure [23][24][25][26]. At least two samples show transitional spectra between these two main types.…”

Section: Phosphatesmentioning

confidence: 99%

Chondrite Shock Metamorphism History Assessed by Non-Destructive Analyses on Ca-Phosphates and Feldspars in the Cangas de Onís Regolith Breccia

et al. 2019

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The Cangas de Onís regolith breccia is an H5-H6 ordinary chondrite that fell to Earth in 1866. It is constituted by 60% H6-H5 clasts within an H5 clastic matrix. All clasts are affected by intense fissuration, with an intricate pattern filled by kamacite and troilite, shock metamorphism of plagioclase into maskelynite. The chondrite is composed of low-Ca pyroxene, olivine and plagioclase as the main silicate phases, with two types of phosphates, taenite-kamacite blebs and troilite. The specimen was studied by micro-Raman spectroscopy, Fourier-transform infrared spectrophotometry (FTIR), spectral cathodoluminescence and computer tomography. The ease with which the specimens can be prepared for analysis using these techniques, and the speed with which relevant information can be obtained, make them excellent tools for the study of non-replaceable materials. Moreover, the Raman and FTIR results offer enough resolution to reveal heterogeneities in the shocked metamorphism throughout the specimen. The obtained results showed that the extent of the metamorphic conditions within the studied sample is heterogeneous, which leads us to believe that the last accretionary event that took place in this regolithic breccia was not significant enough to allow for overall homogenization.

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Understanding the effect of temperature on the crystallization of Eu3+:YPO4 nanophosphors prepared by MW-assisted method

Paradisi,

Mortalò,

Zin

et al. 2024

Ceramics International

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Raman study of zircon-structured RPO₄(R = Y, Tb, Er, Tm) phosphates at high pressures

Cited by 18 publications

References 19 publications

In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄

In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄

Chondrite Shock Metamorphism History Assessed by Non-Destructive Analyses on Ca-Phosphates and Feldspars in the Cangas de Onís Regolith Breccia

Understanding the effect of temperature on the crystallization of Eu3+:YPO4 nanophosphors prepared by MW-assisted method

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Raman study of zircon-structured RPO4(R = Y, Tb, Er, Tm) phosphates at high pressures

Cited by 18 publications

References 19 publications

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 polycrystalline TbPO4, DyPO4, and GdxDy(1−x)PO4

Chondrite Shock Metamorphism History Assessed by Non-Destructive Analyses on Ca-Phosphates and Feldspars in the Cangas de Onís Regolith Breccia

Understanding the effect of temperature on the crystallization of Eu3+:YPO4 nanophosphors prepared by MW-assisted method

Contact Info

Product

Resources

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Raman study of zircon-structured RPO₄(R = Y, Tb, Er, Tm) phosphates at high pressures

In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄

In situ Raman spectroscopy of pressure‐induced phase transformations in polycrystalline TbPO₄, DyPO₄, and Gd_xDy_(1−x)PO₄