Aluminum hyperfine interactions in ruby

Laurance, N.; McIrvine, E. C.; Lambe, John

doi:10.1016/0022-3697(62)90092-6

Cited by 102 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9,13 Moreover, a significant presence of unpaired electrons beyond the first coordination sphere is not supported by electron nuclear double resonance (ENDOR) results obtained on ionic lattices like Al 2 O 3 doped with Cr 3+ . 30,31 Ab initio calculations carried out on transition metal impurities in ionic lattices are consistent with this view. 32,33 Bearing in mind these facts, recent results on Cr 3+ -doped different fluoride and oxide lattices have shown that the observed differences in absorption and emission spectra can all be understood by just considering the internal electric field, E R (r), created by the rest of lattice ions upon the CrF 6 3− or CrO 6 9− complex, respectively, where active electrons are confined.…”

supporting

confidence: 55%

Internal electric fields and color shift in Cr3+-based gemstones

et al. 2012

View full text Add to dashboard Cite

Seeking to better understand the origin of the different colors of emerald and ruby, both ab initio periodic and cluster calculations have been carried out. impurities along the series of ionic oxides can be understood merely through the CrO 6 9− unit but subject to the electric field due to the rest of the lattice ions. As a salient feature it is proved that changes in electronic density and covalency due to the internal field are not the cause of the color shift. Therefore, the red color of ruby is not due to the polarization of the electronic cloud around chromium as a result of the C 3 local symmetry. The present study also demonstrates that the variation of the ligand field splitting parameter, 10Dq, induced by the internal electric field comes mainly from the contributions of first shells of ions around the CrO 6 9− unit. As a consequence, 10Dq in emerald is not influenced by the internal field, as the contribution from Be 2+ first neighbors is practically compensated by that of Si 4+ second neighbors. In contrast, in ruby the t 2g levels are shifted by the internal field 0.24 eV more than the e g ones, so explaining the color shift in this gemstone in comparison with emerald. This result is shown to arise partially from the asymmetric form of the internal electrostatic potential along the C 3 axis in Al 2 O 3 .

show abstract

supporting

confidence: 55%

Internal electric fields and color shift in Cr3+-based gemstones

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The following assignment was made for the lines observed in α-Al 2 O 3 : the line at 693.1 nm was attributed to R emission of the single Cr 3+ ion and the lines at 700.8 and 704.1 nm to pair emissions of the 4NN and 3NN pairs in ruby, respectively [30][31][32]. The Cr 3+ -Cr 3+ pair distances in ruby are 3.19 Å for the 3NN pair and 3.50 Å for the 4NN pair [33]. Due to this similarity one could suppose that during NaMg 3 Al(MoO 4 ) 5 :Cr 3+ crystal growth a small amount of α-Al 2 O 3 phase was created.…”

Section: E-mentioning

confidence: 99%

Optical spectroscopy study of Cr³⁺ ion in NaMg₃Al(MoO₄)₅ crystal

Hermanowicz

2007

Physica Status Solidi (b)

View full text Add to dashboard Cite

Electron absorption, excitation and emission spectra have been measured for Cr 3+ ion-doped NaMg 3 Al(MoO 4 ) 5 crystal in the temperature range from 9 to 300 K. The sharp lines of the 2 E-4 T 2 emission and broadband 4 T 2 -4 A 2 luminescence from strong and weak crystal field Cr 3+ sites as well as their temperature dependencies were observed. Below 200 K, Cr 3+ ion pairs are detected. The local structure of Cr 3+ surroundings is discussed in terms of the spectroscopic results and the crystal field parameters Dq, B and C of the Cr 3+ ion are derived. The Huang -Rhys, S, and breathing phonons, ħω, parameters are reported. The use of the studied crystal as a laser material is briefly analyzed.

show abstract

“…be Gaussian with a half-width Ag at maximum slope, the shape G(H -H ) of the "composite" E is also a Gaussian, with the full 'width 28G at If, for simplicity, the distributions of the D 's are assumed to be all Gaussian and independent of one another, the resulting full width at maximum slope due to strain alone would be given by 2-271/2 28Hs = 2= j aij l<alsiSjla> -<bISiSjlb>]2 [dH/dv] - (27) where the a. are the half-widths at maximum slope of the distributions ij of the Di in energy units,…”

Section: +mentioning

confidence: 99%

“…To evaluate.the linewidth.variation.due.to the strains by means of' Eqs. (27).and (28) The linewidth variation.computed.from Eqs. (27) and (29) with these values of the parameters is illustrated.by the curves labeled "hybrid" in Fig.…”

Section: Hybrid Modelmentioning

confidence: 99%

Electron paramagnetic resonance absorption studies of (Al2O3)1-x (Cr2O3)x with controlled neutron treatments

Wenzel¹

1966

View full text Add to dashboard Cite

Aluminum hyperfine interactions in ruby

Cited by 102 publications

References 20 publications

Internal electric fields and color shift in Cr3+-based gemstones

Internal electric fields and color shift in Cr3+-based gemstones

Optical spectroscopy study of Cr³⁺ ion in NaMg₃Al(MoO₄)₅ crystal

Electron paramagnetic resonance absorption studies of (Al<sub>2</sub>O<sub>3</sub>)<sub>1-x</sub> (Cr<sub>2</sub>O<sub>3</sub>)<sub>x</sub> with controlled neutron treatments

Contact Info

Product

Resources

About

Aluminum hyperfine interactions in ruby

Cited by 102 publications

References 20 publications

Internal electric fields and color shift in Cr3+-based gemstones

Internal electric fields and color shift in Cr3+-based gemstones

Optical spectroscopy study of Cr3+ ion in NaMg3Al(MoO4)5 crystal

Electron paramagnetic resonance absorption studies of (Al<sub>2</sub>O<sub>3</sub>)<sub>1-x</sub> (Cr<sub>2</sub>O<sub>3</sub>)<sub>x</sub> with controlled neutron treatments

Contact Info

Product

Resources

About

Optical spectroscopy study of Cr³⁺ ion in NaMg₃Al(MoO₄)₅ crystal