A Raman spectroscopic study of rare earth mixed oxides

Panitz, Jan‐Christoph; Mayor, J.W.; Grob, B.; Durisch, W.

doi:10.1016/s0925-8388(00)00606-x

Cited by 43 publications

(25 citation statements)

References 11 publications

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“…Raman spectra presented in this work are, in general, in good agreement with the literature [23][24][25]. First of all, it should be noted that none of the spectra show the expected number of bands.…”

Section: Resultssupporting

confidence: 90%

Raman characterisation of powder of cubic RE2O3 (RE=Nd, Gd, Dy, Tm, and Lu), Sc2O3 and Y2O3

Ubaldini

Carnasciali

2008

Journal of Alloys and Compounds

207

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Section: Resultssupporting

confidence: 90%

Raman characterisation of powder of cubic RE2O3 (RE=Nd, Gd, Dy, Tm, and Lu), Sc2O3 and Y2O3

Ubaldini

Carnasciali

2008

Journal of Alloys and Compounds

207

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“…Other weaker modes are observed at 332, 420, 464 and 585 cm −1 . These results are in excellent agreement with the Raman spectrum reported by Tucker et al [22] and more recently with Panitz et al [24] and Ubaldini and Carnasciali. [25] Towards lower wavenumbers, weaker modes are observed at about 111, 148, 171 and 204 cm −1 some of which have in principle been observed earlier [22] but not identified.…”

Section: Characterization At Ambientsupporting

confidence: 92%

Pressure‐induced anomalous phase transformation in nano‐crystalline dysprosium sesquioxide

Sharma

Singh

Dogra

et al. 2011

J Raman Spectroscopy

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The phase transformation in nano-crystalline dysprosium sesquioxide (Dy 2 O 3 ) under high pressures is investigated using in situ Raman spectroscopy. The material at ambient was found to be cubic in structure using X-ray diffraction (XRD) and Raman spectroscopy, while atomic force microscope (AFM) showed the nano-crystalline nature of the material which was further confirmed using XRD. Under ambient conditions the Raman spectrum showed a predominant cubic phase peak at 374 cm −1 , identified as F g mode. With increase in the applied pressure this band steadily shifts to higher wavenumbers. However, around a pressure of about 14.6 GPa, another broad band is seen to be developing around 530 cm −1 which splits into two distinct peaks as the pressure is further increased. In addition, the cubic phase peak also starts losing intensity significantly, and above a pressure of 17.81 GPa this peak almost completely disappears and is replaced by two strong peaks at about 517 and 553 cm −1 . These peaks have been identified as occurring due to the development of hexagonal phase at the expense of cubic phase. Further increase in pressure up to about 25.5 GPa does not lead to any new peaks apart from slight shifting of the hexagonal phase peaks to higher wavenumbers. With release of the applied pressure, these peaks shift to lower wavenumbers and lose their doublet nature. However, the starting cubic phase is not recovered at total release but rather ends up in monoclinic structure. The factors contributing to this anomalous phase evolution would be discussed in detail.

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“…33 Therefore, only a non-polarized spectra were measured. As it was mentioned in previous works, 14,18,29 for some laser lines in addition to the peaks, originating by phonon scattering, in the Raman spectra there are observed other peaks due to fluorescence and/or electronic Raman scattering, originating by transitions between the electronic states of the R 3þ ions or small impurities of other R 3þ ions. 18 Their presence might confuse the finding of the corresponding phonon Raman peaks in the different compounds.…”

Section: Experimental and Computational Detailssupporting

confidence: 52%

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

124

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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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A Raman spectroscopic study of rare earth mixed oxides

Cited by 43 publications

References 11 publications

Raman characterisation of powder of cubic RE2O3 (RE=Nd, Gd, Dy, Tm, and Lu), Sc2O3 and Y2O3

Raman characterisation of powder of cubic RE2O3 (RE=Nd, Gd, Dy, Tm, and Lu), Sc2O3 and Y2O3

Pressure‐induced anomalous phase transformation in nano‐crystalline dysprosium sesquioxide

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

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