Raman spectra of lanthanide sesquioxide single crystals: Correlation between A and B-type structures

Gouteron, J.; Michel, D.; Lejus, A.M.; Zarembowitch, J.

doi:10.1016/0022-4596(81)90058-x

Cited by 117 publications

(93 citation statements)

References 15 publications

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“…In analogy with the previously reported modes for the hexagonal phases, 27 the mode at ∼484.8 may be identified as the A 1g and the mode at 512.6 cm −1 may be assigned to the E g mode. It may be pertinent to point out here that according to Shaack and Koningston, 6 Yb 2 O 3 is known to behave differently from all other rare earth sesquioxides where the Raman lines are considerably broadened.…”

Section: Resultssupporting

confidence: 74%

“…A 1g and E g , and two bending vibrations of the A 1g and E g . 11,27 Hence, above the transition pressure, the cubic Yb 2 O 3 transforms to hexagonal phase (A) which belongs to the space group P3m1(D 3 3d ). The two Yb atoms and two oxygen atoms are in the (2d) position with site symmetry C 3v , and the remaining oxygen atom is in the (1a) position with site symmetry D 3d .…”

Section: Resultsmentioning

confidence: 99%

“…The oxygen atom at (1a) position is octrahedrally surrounded by six Yb-atoms; whereas, the same at (2d) position are surrounded by Yb atoms at the corner of the slightly distorted tetrahedron. 27 The irreducible representations of the vibrations of the atoms in hexagonal Yb 2 O 3 phase are:…”

Section: Resultsmentioning

confidence: 99%

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Anharmonic behavior and structural phase transition in Yb2O3

Pandey¹,

Samanta²,

Singh³

et al. 2013

AIP Advances

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The investigation of structural phase transition and anharmonic behavior of Yb2O3 has been carried out by high-pressure and temperature dependent Raman scattering studies respectively. In situ Raman studies under high pressure were carried out in a diamond anvil cell at room temperature which indicate a structural transition from cubic to hexagonal phase at and above 20.6 GPa. In the decompression cycle, Yb2O3 retained its high pressure phase. We have observed a Stark line in the Raman spectra at 337.5 cm−1 which arises from the electronic transition between 2F5/2 and 2F7/2 multiplates of Yb3+ (4f13) levels. These were followed by temperature dependent Raman studies in the range of 80–440 K, which show an unusual mode hardening with increasing temperature. The hardening of the most dominant mode (Tg + Ag) was analyzed in light of the theory of anharmonic phonon-phonon interaction and thermal expansion of the lattice. Using the mode Grüneisen parameter obtained from high pressure Raman measurements; we have calculated total anharmonicity of the Tg + Ag mode from the temperature dependent Raman data.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

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Anharmonic behavior and structural phase transition in Yb2O3

Pandey¹,

Samanta²,

Singh³

et al. 2013

AIP Advances

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show abstract

“…In this study, the excitation wavelength is 514 nm, the laser power on the sample surface is about 8 mW and the spot size 1.5 mm. The frequency and symmetry of the fundamental Raman active phonon modes for the fabricated SmNTs are similar to the reported assignment of B-type Sm 2 O 3 [22]. The phonon mode frequencies observed at 256, 462 and 573 cm À1 were identified as A g modes.…”

Section: Resultssupporting

confidence: 64%

Room temperature synthesis of samarium oxide nanotubes using cost-effective electroless deposition method

Boehme¹,

Ionescu

et al. 2012

Journal of Experimental Nanoscience

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Nanotubes consisting of samarium oxide (SmNT) were fabricated by electroless deposition using ion track-etched polycarbonate templates. To achieve nanotubes with thin walls and small surface roughness, the tubes were generated by a procedure containing several steps under aqueous conditions. The approach reported below will process open-ended nanotubes with well-defined outer diameter and wall thickness.

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“…20 16,20,22 Hence, the irreducible representation according to group theory gives 21 Raman active modes which include 14A g and 7B g modes. Gouteron et al 17 also predicted 21 Raman active modes, i.e., 14A g þ 7B g , from the factor group analysis for B-type crystals, although fewer modes are observed in practice. We have calculated the mode Gr€ uneisen Parameter (c), which provides a dimensionless representation of the response to compression from the pressure dependent frequency shifts dx=dP (Fig.…”

Section: High Pressure Behaviormentioning

confidence: 98%

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Pandey

Samanta

Singh

et al. 2014

Journal of Applied Physics

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Pressure and temperature dependent Raman scattering studies on Ho2O3 have been carried out to investigate the structural transition and the anharmonic behavior of the phonons. Ho2O3 undergoes a transition from cubic to monoclinic phase above 15.5 GPa, which is partially reversible on decompression. The anharmonic behavior of the phonon modes of Ho2O3 from 80 K to 440 K has been investigated. We find an anomalous line-width change with temperature. The mode Grüneisen parameter of bulk Ho2O3 was estimated from high pressure Raman investigation up to 29 GPa. Furthermore, the anharmonic components were calculated from the temperature dependent Raman scattering.

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Raman spectra of lanthanide sesquioxide single crystals: Correlation between A and B-type structures

Cited by 117 publications

References 15 publications

Anharmonic behavior and structural phase transition in Yb2O3

Anharmonic behavior and structural phase transition in Yb2O3

Room temperature synthesis of samarium oxide nanotubes using cost-effective electroless deposition method

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

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