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Irreversible phase transition and functional property recovery of pressurized Eu2O3.

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Název: Irreversible phase transition and functional property recovery of pressurized Eu2O3.
Autoři: Ren, Xiangting, Cai, Weizhao, Yan, Xiaozhi, Wang, Lin
Zdroj: Journal of Chemical Physics; 10/14/2025, Vol. 163 Issue 14, p1-6, 6p
Témata: PHASE transitions, RARE earth oxides, RAMAN spectroscopy, THERMAL conductivity, OPTICAL coatings
Abstrakt: The pressure-induced phase transition of cubic Eu2O3 was systematically investigated using in situ Raman and photoluminescence spectroscopy up to 25.7 GPa. Our results demonstrate that the cubic-to-hexagonal phase transition in Eu2O3 occurs at 7.5 GPa, as evidenced by pressure-dependent Raman spectra. The calculated Grüneisen parameters for the vibrational modes in both the cubic and hexagonal phases of Eu2O3 revealed a significant decrease during the cubic-to-hexagonal phase transition, implying a potential enhancement in thermal conductivity. The significant change in the luminescence intensity ratio between the 5D0 → 7F2 and 5D0 → 7F1 transitions under increasing pressure confirmed the phase transition in Eu2O3, as corroborated by high-pressure Raman spectroscopy. The observed red shift in the emission is attributed to the expansion of the Eu3+ f-orbital, whereas the variation in the intensity ratio originates from symmetry distortions in the crystal field under compression. Upon decompression, the material adopted a metastable monoclinic phase, which is indicative of an irreversible phase transition. This metastable monoclinic polymorph of Eu2O3 at ambient pressure holds potential for applications in high-precision optical coatings, wavelength-selective filters, and next-generation solid-state laser systems. Our results established that pressure-mediated structural and photoluminescence tailoring can activate unprecedented optical functionalities in Eu2O3, thereby enabling tailored optoelectronic device engineering. [ABSTRACT FROM AUTHOR]
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Abstrakt:The pressure-induced phase transition of cubic Eu<subscript>2</subscript>O<subscript>3</subscript> was systematically investigated using in situ Raman and photoluminescence spectroscopy up to 25.7 GPa. Our results demonstrate that the cubic-to-hexagonal phase transition in Eu<subscript>2</subscript>O<subscript>3</subscript> occurs at 7.5 GPa, as evidenced by pressure-dependent Raman spectra. The calculated Grüneisen parameters for the vibrational modes in both the cubic and hexagonal phases of Eu<subscript>2</subscript>O<subscript>3</subscript> revealed a significant decrease during the cubic-to-hexagonal phase transition, implying a potential enhancement in thermal conductivity. The significant change in the luminescence intensity ratio between the <sup>5</sup>D<subscript>0</subscript> → <sup>7</sup>F<subscript>2</subscript> and <sup>5</sup>D<subscript>0</subscript> → <sup>7</sup>F<subscript>1</subscript> transitions under increasing pressure confirmed the phase transition in Eu<subscript>2</subscript>O<subscript>3</subscript>, as corroborated by high-pressure Raman spectroscopy. The observed red shift in the emission is attributed to the expansion of the Eu<sup>3+</sup> f-orbital, whereas the variation in the intensity ratio originates from symmetry distortions in the crystal field under compression. Upon decompression, the material adopted a metastable monoclinic phase, which is indicative of an irreversible phase transition. This metastable monoclinic polymorph of Eu<subscript>2</subscript>O<subscript>3</subscript> at ambient pressure holds potential for applications in high-precision optical coatings, wavelength-selective filters, and next-generation solid-state laser systems. Our results established that pressure-mediated structural and photoluminescence tailoring can activate unprecedented optical functionalities in Eu<subscript>2</subscript>O<subscript>3</subscript>, thereby enabling tailored optoelectronic device engineering. [ABSTRACT FROM AUTHOR]
ISSN:00219606
DOI:10.1063/5.0292717