Phonon and Electronic Raman Spectra of Cubic Rare-Earth Oxides and Isomorphous Yttrium Oxide*

Schaack, G.; Koningstein, J. A.

doi:10.1364/josa.60.001110

Cited by 141 publications

(86 citation statements)

References 12 publications

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“…6 As shown in Figure 2, we have observed five distinct lines (I 1 -I 5 ) at 269.6, 301.9, 337.5, 363.8, and 613.5 cm −1 , and a wide shoulder in the range of 400-545 cm −1 . The lines (I 1 -I 5 ) are assigned as the T g + E g , E g , el (C 3i ), T g + A g , and T g , respectively; the observed line I 3, at 337.5 cm −1 is referred to as a Stark level assignment for Yb 3+ ion in C 3i site.…”

Section: Resultsmentioning

confidence: 53%

“…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. This observation is consistent with the present result.…”

Section: Resultsmentioning

confidence: 85%

“…6) shows modes at 281.3, 306.4, 332.7, 357.8, 419.9, and 435.6 cm −1 , corresponding to the T g + E g , E g , el , T g + A g , and two T g , respectively. 6 It is interesting to observe the electronic contribution ( el ) at 332.7 cm −1 . 25,26 It is also significant to point out that the shoulder region i.e.…”

Section: Resultsmentioning

confidence: 99%

“…5 At ambient, the RE oxides exist in three polymorphic phases: for large cationic radius (La to Nd), the hexagonal phase designated as the A-type with a space group P3m1 is the most stable; for the medium cations (Sm to Gd), the monoclinic phase designated as B-type with space group C 2 /m is preferred; and for the small cations (Tb to Lu), the cubic-phase designated as C-type with space group I a3 is the most stable. 6,7 The high pressure studies of RE sesquioxides are a subject of fundamental research; particularly to address the problems of stability and structural transformation, metal-insulator transition, enhancement or collapse of magnetic ordering, and amorphization, etc. Under such conditions the bonding patterns established for the systems near ambient conditions change dramatically, causing profound effects on numerous physical and chemical properties and leading to the formation of new classes of materials.…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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 most informative papers we found, in order of the increasing ionic radius of the rare earth, are for Sc-Refs. 12 11,12,15,22,26,27,31 only in few of them 11,12,27 polarized Raman spectra are shown. In some works, the symmetry of the phonon modes, giving rise to the observed peaks in the Raman spectra of Sc 2 3 11,15,27 this assignment is supported by the published experimental data.…”

Section: Introductionmentioning

confidence: 99%

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Abrashev

Todorov

Geshev

2014

Journal of Applied Physics

132

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Dielectric and optical properties of epitaxial rare-earth scandate films and their crystallization behavior Appl. Phys. Lett. 88, 262906 (2006) Raman spectra of R 2 O 3 (R-Sc, Er, Y, Ho, Gd, Eu, and Sm) powders with C-type bixbyite crystal structure are measured. With the help of these data and ones, previously published for other oxides from the same structural family, general dependencies of the frequencies of the Raman peaks on the cubic crystal unit cell parameter are constructed. Using these dependencies and knowing the symmetry of the peaks for one of the oxides, determined from previous single-crystal measurements, it is possible to find out the symmetry of the peaks from the spectra of all compounds. It was found that the frequency of the six lowest frequency peaks scales with the square root of the mass of the rare earth showing that mainly R ions take part in these vibrations. These results agree with performed here lattice dynamical calculations. The anomalous softening of the frequency of some peaks in the spectra of Eu 2 O 3 is discussed. V C 2014 AIP Publishing LLC.

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Characterization of ytterbium-yttrium mixed oxides using Raman spectroscopy and x-ray powder diffraction

Panitz

1999

J. Raman Spectrosc.

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Ytterbium-yttrium mixed oxides, which are potential emitter materials for thermophotovoltaic energy converters, were prepared using two different synthesis methods. The results of a characterization using Raman spectroscopy and x-ray powder diffraction (XRD) are presented. The purpose of this study was to confirm whether the materials prepared are indeed substitutional solid solutions of ytterbium oxide and yttrium oxide. Both XRD and Raman spectroscopy are established techniques for the analysis of solid solutions. Linear relationships between the Raman band position and the composition of mixed crystals are known for solid solutions with one active Raman mode. An aspect of this study was the investigation of the relationship between composition and band position and linewidth of vibrational modes when applying Raman techniques to a system with several vibrational modes. A linear relationship between the band position of a vibrational mode at about 600 cm −1 , which is assigned to a stretching vibration, and the ytterbium content of the material was observed. Using an empirical fit to the most intense band around 370 cm −1 , even a substitution of 2 mol% Yb may be detected using non-linear least-squares data analysis. In addition, a discussion of additional features observed in the Raman spectra at Raman shifts >650 cm −1 is presented.

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Phonon and Electronic Raman Spectra of Cubic Rare-Earth Oxides and Isomorphous Yttrium Oxide*

Cited by 141 publications

References 12 publications

Anharmonic behavior and structural phase transition in Yb2O3

Anharmonic behavior and structural phase transition in Yb2O3

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Characterization of ytterbium-yttrium mixed oxides using Raman spectroscopy and x-ray powder diffraction

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