Vibrational spectra of chrysoberyl (BeAl2O4)

Burshtein, Z.; Henderson, D. O.; Morgan, S. H.; Silberman, E.

doi:10.1016/0022-3697(89)90018-8

Cited by 8 publications

(22 citation statements)

References 8 publications

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“…Of our ignorance, just after completing our analysis using this form, we found that Burshtein et al had already derived exactly the same form as Eq. (2) in 1989 for a bulk chrysoberyl and obtained the same results as ours [5]. However, they measured the Raman lines at room temperature to identify the Raman spectra in Cr-doped chrysoberyl, on the contrary we measured them till 500 K to find an increasing tendency of the half-width as well as of redshifted Raman lines with increasing temperatures.…”

Section: Experimental and Analysismentioning

confidence: 52%

Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Chiba

Ohkura

1999

Radiation Effects and Defects in Solids

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Raman scattering for three kinds of chrysoberyl, undoped, doped with Ti3+ ions or Cr3+ ions, has been measured. The half-widths, W, of several Raman lines with A, symmetry modes are represented as a form of W = A coth(B/kT). The fitting parameters of A and B are 4--11 cm-' and 40-60meV, respectively. The red-shifts of the Raman lines with increasing temperature are found also to be the same form to W. The form is coincident with an empirical form of the EPR linewidth of Ti3+ ions in chrysoberyl obtained by us previously. The facts may imply that the local phonon modes, which would be caused from bulk phonons, would contribute to phonon-assisted relaxation of Ti'+ ion system in chrysoberyl.%'+ ions in chrysoberyl; Laser material words; Ti3+-doped chrysoberyl; BeA1204 : Ti3+; EPR; Raman scattering;

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Section: Experimental and Analysismentioning

confidence: 52%

Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Chiba

Ohkura

1999

Radiation Effects and Defects in Solids

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“…ν is the wavenumber of the decaying phonon, and ν 1 and ν 2 are the wavenumbers of the resulting phonons (wavenumber values of optical phonons from Ref. [23] ). The discrepancies between the ν and ν 1 + ν 2 are within experimental error in Ref.…”

Section: Discussionmentioning

confidence: 99%

“…In the alexandrite crystal, there are 36 Raman active vibrations, whereas 11 of them are A g species, appearing for

P_{italicxx}^{((), 1)} (α) \neq 0

P_{italicyy}^{((), 1)} (α) \neq 0

P_{italiczz}^{((), 1)} (α) \neq 0

; 7 of them are B 1 g species, for which only

P_{italicxy}^{((), 1)} (α) \neq 0

; 11 of them are B 2 g modes with

P_{italicxz}^{((), 1)} (α) \neq 0

; and 7 of them are B 3 g modes with

P_{italicyz}^{((), 1)} (α) \neq 0

. The indices x , y , and z correspond to the crystallographic axes a , b , and c . Thus, choosing the proper geometry in OKE experiment, we have been able to separate the contributions of groups of phonons of the same symmetry.…”

Section: Theorymentioning

confidence: 99%

“…In the alexandrite crystal, there are 36 Raman active vibrations, [23,24] whereas 11 of them are A g species, appearing for…”

Section: Introductionmentioning

confidence: 99%

“…The indices x, y, and z correspond to the crystallographic axes a, b, and c. [23,24] Thus, choosing the proper geometry in OKE experiment, we have been able to separate the contributions of groups of phonons of the same symmetry. If, for example, the pump beam is propagating along z crystal axis, the polarization of the optical field along x or y axis allows observation of the A g phonons, since the only…”

Section: Introductionmentioning

confidence: 99%

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Coherent optical phonons in alexandrite crystal studied by Optical Kerr Effect spectroscopy

Polok

Konarska

Ratajska-Gadomska

et al. 2013

J Raman Spectroscopy

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Herewith, we report on the first observation of coherent phonons in alexandrite crystal obtained by means of the femtosecond Optical Kerr Effect spectroscopy. We have managed to observe dynamics of the Raman‐active modes with high resolution and to find their lifetimes in the temperature range between 263 K and 373 K. We have used the obtained temperature dependence of phonon lifetimes and frequencies for calculation of the anharmonic coupling constants. On the basis of our results, we have also calculated the widths of homogeneously broadened Raman lines. Our results prove that, in case of transparent samples, this experimental technique is a very good alternative to the commonly used transient reflection method. Copyright © 2013 John Wiley & Sons, Ltd.

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Characterization of chrysoberyl and its gemmological varieties by Raman spectroscopy

Rybnikova

Bačík

Uher

et al. 2023

J Raman Spectroscopy

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Various chrysoberyl varieties (non‐phenomenal chrysoberyl, alexandrite and cymophane) are gemstones of high demand; therefore, they are subjected to numerous substitutions by other materials and synthetic analogues. To address this issue, non‐destructive methods for studying gemstones are highly sought after. Raman spectroscopy is one of the most suitable non‐destructive methods for studying gemstones as it requires no sample preparation and does not leave any price‐reducing signs on the gemstone surface. The research is focused on Raman spectroscopy application on chrysoberyl identification, differentiation between its varieties, inclusion analysis, and detection of synthetic analogues and imitations. The alexandrite variety can be identified by its broad luminescence band that ranges from 640 to 790 nm (15 625–12 658 cm−1). Synthetic alexandrite has sharper and more intensive bands on the luminescence spectrum, especially 690 and 696 nm (14 492–14 367 cm−1). Rutile inclusions can be distinguished by a broad band 580–640 cm−1 in the Raman spectrum. Imitations of chrysoberyl represented by corundum and colour‐changing spessartine was also identified. The orientation of faceted stones can also be determined by specific bands present in the Raman spectrum.

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Vibrational spectra of chrysoberyl (BeAl2O4)

Cited by 8 publications

References 8 publications

Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Coherent optical phonons in alexandrite crystal studied by Optical Kerr Effect spectroscopy

Characterization of chrysoberyl and its gemmological varieties by Raman spectroscopy

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Vibrational spectra of chrysoberyl (BeAl2O4)

Cited by 8 publications

References 8 publications

Consistent temperature-broadening of EPR line of Ti3+ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Consistent temperature-broadening of EPR line of Ti3+ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Coherent optical phonons in alexandrite crystal studied by Optical Kerr Effect spectroscopy

Characterization of chrysoberyl and its gemmological varieties by Raman spectroscopy

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Product

Resources

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Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl

Consistent temperature-broadening of EPR line of Ti³⁺ions with that of bulk raman spectrum related to laser-quality chrysoberyl