Influence of varying thermodynamic parameters on the structural behavior of nano-crystalline europium sesquioxide

Bura, Neha; Yadav, Deepa; Bhoriya, Ankit; Singh, Jasveer; Sharma, Nita Dilawar

doi:10.1016/j.jallcom.2020.158129

Cited by 5 publications

(11 citation statements)

References 65 publications

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“…As can be seen from the graph, the modes at the lower-wavenumber side show an increase in relative intensity with the increase of the temperature. Such an observation was also made in our previous work on other rare-earth sesquioxides. − From the unnormalized data shown in Supplementary Figure S1, it was observed that this increase was relative with respect to mode I 6 , which showed a significant drop in intensity with an increase in temperature. In Supplementary Figure S2, the absolute intensity ratios I 6 /I 1 and I 6 /I 2 show a gradual drop, indicating that the observed increase in the intensity of the low-wavenumber modes occurs relatively, primarily due to drop in the intensity of mode I 6 and, to a much smaller extent, due to a marginal increase in the intensity of modes I 1 and I 2 .…”

Section: Resultssupporting

confidence: 80%

“…Our group has investigated the phonon softening and broadening for several other nanocrystalline rare-earth oxides, which were attributed to the anharmonic effects and lattice expansion of the materials. − ,, However, this asymmetric line shape was not observed earlier and can probably be attributed to the Fano scattering in the present case. To the best of our knowledge, no reports have been published on the Fano interference in pure/undoped rare-earth oxides except for CeO 2 .…”

Section: Resultsmentioning

confidence: 61%

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Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

et al. 2021

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The temperature-dependent evolution of the vibrational properties of nanocrystalline cubic-phase thulium sesquioxide (Tm2O3) using Raman scattering is investigated in the 80–440 K temperature range. The phonon modes in the Raman spectra of the sample were found to exhibit a red shift with increase in the sample temperature. The most prominent Fg + Ag mode was observed at 383 cm–1; however, its line shape was found to be asymmetric in nature. Briet–Wigner–Fano (BWF) line shape was used to derive the vibrational characteristics of this mode. Further, the coupling coefficient, i.e., 1/q, was estimated, and the anharmonic parameters for the sample were also calculated in the given temperature range up to 440 K. The temperature dependency of the phonon frequency revealed three to six times greater magnitude of explicit anharmonicity as compared to that of implicit anharmonicity, with the dominance of the three-phonon process as determined by the line width of the peak with varying temperature.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 61%

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

et al. 2021

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“…Our group also reported a phase transition from cubic to monoclinic in Eu 2 O 3 having some content of the Eu 1-x O 24 . Recently, we have also reported a cubic to hexagonal transition in pure Eu 2 O 3 which initiated at 4.79 GPa and completed at 15 GPa 25 . The pure Eu 2 O 3 shows a direct transition from the cubic to the hexagonal phase.…”

Section: Introductionmentioning

confidence: 80%

Pressure driven polymorphic transitions in nanocrystalline Lu2O3, Tm2O3 and Eu2O3

Bura,

Bhoriya,

Yadav

et al. 2023

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The crystallite size of the materials considerably influences the material properties, including their compressibility and resistance to external forces and the stability of the crystalline structure; a corresponding study for which, so far, has been limited for the important class of nanocrystalline Rare Earth Sesquioxides (REOs). In the present study, we report the crystallographic structural transitions in nanocrystalline Rare Earth Oxides (REOs) under the influence of pressure, investigated via high-energy X-Ray Diffraction (XRD) measurements. The study has been carried out on three of the REOs, namely Lutetium oxide (Lu2O3), Thulium oxide (Tm2O3) and Europium oxide (Eu2O3) up to the pressures of 33, 22 and 11 GPa, respectively. The diffraction data of Lu2O3 and Tm2O3 suggests the occurrence of irreversible structural transitions from cubic to monoclinic phase, while Eu2O3 showed a transition from the cubic to hexagonal phase. The transitions were found to be accompanied by a collapse in the volume and the resulting Pressure–Volume (P–V) graphs are fitted with the 3rd order Birch-Murnaghan (BM) equation of state (EOS) to estimate the bulk moduli and their pressure derivatives. Our study establishes a qualitative relationship between the crystallite size and various material properties such as the lattice parameters, transition pressure, bulk modulus etc., and strengthens the knowledge regarding the behaviour of this technologically important class of materials.

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“…Our group has observed similar behavior for Eu 2 O 3 and Lu 2 O 3 where nanocrystalline material exhibited higher stability and showed higher values of transition pressure in comparison to their bulk counterparts. As mentioned, this observation has been attributed to lower defect density in nano-materials [36,37]. Sc 2 O 3 also shows greater stability in comparison to the other rare earth oxides in which transition has been observed at very low pressures, for example, the transition pressure of Dy 2 O 3 is at 7.7 GPa [17], for Ho 2 O 3 is at 8.9 GPa [15], for Er 2 O 3 is at 9.9 GPa [63], for Lu 2 O 3 at 12.7 GPa [14].…”

Section: Resultsmentioning

confidence: 77%

“…However, some intermediate radii cations [16,[20][21][22][23][24][25][26][27][28]. Our group has also carried out high-pressure structural investigations on rare earth oxides using the Raman spectroscopy technique [29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Crystallographic structural variations in nano-crystalline Sc₂O₃ under pressure

et al. 2023

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The present manuscript reports high pressure investigations on nano-crystalline Scandium Oxide (Sc2O3) through synchrotron angle dispersive x-ray diffraction technique (ADXRD) up to a pressure of ~35.4 GPa using a diamond-anvil cell (DAC). The sample, having a cubic or bixbyite structure at ambient conditions, underwent substantial changes in crystallographic parameters while exhibiting phase stability i.e. does not undergo any structural phase transition upto the studied pressure. The lattice parameters and the unit cell volume decrease significantly with an increase in pressure revealing compressible nature of the crystal structure. The pressure-volume data is fitted using third-order Birch-Murnaghan equation of state to calculate bulk modulus and its first derivative, which yields zero pressure bulk modulus of 213.5 GPa, with B' = 10.3 and the corresponding ambient volume per unit molecule comes out to be 59.17 Ǻ3.

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Influence of varying thermodynamic parameters on the structural behavior of nano-crystalline europium sesquioxide

Cited by 5 publications

References 65 publications

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

Pressure driven polymorphic transitions in nanocrystalline Lu2O3, Tm2O3 and Eu2O3

Crystallographic structural variations in nano-crystalline Sc₂O₃ under pressure

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Influence of varying thermodynamic parameters on the structural behavior of nano-crystalline europium sesquioxide

Cited by 5 publications

References 65 publications

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm2O3: Fano Interference and Phonon Anharmonicity

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm2O3: Fano Interference and Phonon Anharmonicity

Pressure driven polymorphic transitions in nanocrystalline Lu2O3, Tm2O3 and Eu2O3

Crystallographic structural variations in nano-crystalline Sc2O3 under pressure

Contact Info

Product

Resources

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Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

Temperature-Dependent Phonon Behavior in Nanocrystalline Tm₂O₃: Fano Interference and Phonon Anharmonicity

Crystallographic structural variations in nano-crystalline Sc₂O₃ under pressure