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

Ubaldini, Alberto; Carnasciali, M. M.

doi:10.1016/j.jallcom.2006.12.067

Cited by 202 publications

(78 citation statements)

References 34 publications

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“…It is known with high accuracy for all members of the family. Ubaldini and Carnasciali 17 have found that the frequency of the most intense peak monotonically decreases with the increase of the unit cell parameter. Gouteron et al 15 frequency dependencies for six peaks using data of five rareearth oxides.…”

Section: Introductionmentioning

confidence: 96%

“…Given that the Raman spectra are dominated by one very intense peak at about 350 cm À1 , most of the attempts have been made to find the dependence of the frequency of this peak on the type of the rare earth using as a structural parameter the averaged R-O distance, 14 the number of f-electrons of the R 3þ ion, 25,28 or the mass of the R 3þ ion. 17 It appears that in this case the unit cell parameter of the cubic crystal lattice is the most suitable parameter. It is known with high accuracy for all members of the family.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

120

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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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Section: Introductionmentioning

confidence: 96%

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

120

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“…1 They are excellent host materials for solid state lasers 2 and improved phosphors. 3,4 They have high thermal stability and toughness suitable for their application in refractors or abrasives.…”

Section: Introductionmentioning

confidence: 99%

“…7 It is well known that Raman scattering is one of the most powerful techniques to investigate the phonon spectrum, electron phonon coupling, structural phase transitions, and anharmonic behavior of the optical modes. Raman spectroscopic investigations of the high pressure phases of nanocrystalline Eu 2 …”

Section: Introductionmentioning

confidence: 99%

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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“…The wavelengths of the emissions correspond to the region of the boundary between L and U bands of the lowest dispersion of optical fiber. The Raman spectra from the two different areas of the sample annealed at T a = 1100 • C show a peak at 304.807 cm −1 for both areas, which does not correspond to the 375 cm −1 Raman shift of Tm 2 O 3 , 15 indicating that the luminescence is not due to Tm 3+ in Tm 2 O 3 . The two different spectra therefore possibly originated from the two different types (B and C types) of Tm 2 Si 2 O 7 , whose presence was confirmed by GIXD and TEM, although we could not clearly identify which spectra are from the type-B and -C silicates or from the combination of the two types.…”

Section: Resultsmentioning

confidence: 91%

Light emission from thulium silicates and oxides for optical amplifiers on silicon in the extended optical communications band

2013

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Films composed of Tm2Si2O7 and Tm2O3 grains formed on SiO2/Si substrates by radio magnetic sputtering and subsequent thermal annealing up to 1250 °C were characterized by synchrotron grazing incidence X-ray diffraction, cross-sectional transmission microscopy, and micro photoluminescence (PL) measurements. The films composed of triclinic (type-B) and monoclinic (type-C) Tm2Si2O7 grains on SiO2/Si and Tm2O3 grains on Si exhibit photoluminescence at the wavelength of about 1620 nm for the silicates and 1630 nm for the oxide, which indicates that they have good potential as light amplifiers on Si in the L and U bands at telecommunications wavelengths

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

Cited by 202 publications

References 34 publications

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

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

Anharmonic behavior and structural phase transition in Yb2O3

Light emission from thulium silicates and oxides for optical amplifiers on silicon in the extended optical communications band

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