Optical spectroscopic study of synthetic NaScSi2O6–CaNiSi2O6 pyroxenes at normal and high pressures

Taran, Michail N.; Ohashi, Haruo; Koch‐Müller, Monika

doi:10.1007/s00269-007-0202-6

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…The distinct pressureinduced shifts of the d-and e-bands to higher energies (Fig. 6) is rather consistent with such an interpretation as a similar shift of the 3 A 2g → 3 T 2g band of VI Ni 2+ was observed also in the high-pressure spectra of NaScSi 2 O 6 -CaNiSi 2 O 6 pyroxenes (Taran et al, 2008). On the other hand, we should note that no bands caused by two another spin-allowed transitions of VI Ni 2 , optical spectroscopy of cobalt-bearing spinel and staurolite observations for the e-band in spectra of synthetic cobalt aluminum silicate garnets (Taran et al 2002).…”

Section: +supporting

confidence: 85%

“…Judging from the Tanabe-Sugano diagram for d 7 -configuration in tetrahedral coordination (e.g. Alonso and Alcalá, 1977) (Taran et al, 2008). The bands d and e in the spectrum of staurolite (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…35000 -8000 cm -1 were measured with a home-made microspectrophotometer described elsewhere (e.g. Taran et al, 2008). Spectra in the range 8000 -3000 cm -1 were measured on a Bruker IFS 66v FTIR spectrometer equipped with a Hyperion microscope.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

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Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Taran¹,

Koch‐Müller

Feenstra

2009

American Mineralogist

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Optical absorption spectra of natural Co-bearing spinel and staurolite were studied at different temperatures and pressures. In both minerals two broad intense structured bands in the range 5500 -8000 cm -1 and 15000 -19000 cm -1 , caused by electronic spin-allowedare the predominant absorption features.In addition, in both cases broad bands, derived from spin-allowed electronic transitions, appear in the near infrared range partly overlapping the bands caused by IV Co 2+ .In staurolite the NIR range of the spectra are complicated by intense sharp lines of OHvibrations at around 3400 cm

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Section: +supporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

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Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Taran¹,

Koch‐Müller

Feenstra

2009

American Mineralogist

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“…These observations are different from what was observed on the temperature dependence of crystal field data of chromium in uvarovite (Taran et al 1994). However, it is confirmed by recent results on synthetic Ni-bearing pyroxenes (Taran et al 2006), where the Racah parameter B could be determined with higher accuracy than that of Cr 3+ in the present case. The reasons for afore mentioned differences in B of chromium and nickel is due much higher width of the band in the former than in the latter system.…”

Section: Methodssupporting

confidence: 89%

Pressure dependence of color of natural uvarovite: the barochromic effect

Taran¹,

Langer

Koch‐Müller

2007

Phys Chem Minerals

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The electronic absorption spectra of natural uvarovite containing 62 mole % of the Cr 3+ end-member were studied at pressures between 10 -4 and ca. 13 GPa using DAC techniques combined with microscope spectrometric device. With increasing pressure a barochromic effect with change from green to red change of the garnet specimen was observed. This change could be interpreted on the basis of the spectra and the data points derived in an ICE color card. The evaluation of crystal field data from the spectra showed that 10Dq of chromium increases on pressure while the Racah parameter B, and thus the nature of the chemical bond of Cr-O does not change significantly.

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“…Dq (octahedral). 43,44 As a result, for ZGGO:Ni 2+ nanoparticles, it is reasonable to believed that Ni 2+ ions can occupy octahedral and tetrahedral sites in the spinel ZGGO host.…”

Section: Resultsmentioning

confidence: 99%

Doping and luminescence mechanisms of broadband NIR‐II emitting Zn₂₍₁₋_x₎Ni₂_xGa₃Ge_0.75O₈ nanoparticles

et al. 2022

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In this study, Zn 2(1−x) Ni 2x Ga 3 Ge 0.75 O 8 (x = 0.0002, 0.001, 0.002, 0.010, 0.020, and 0.030) nanoparticles with broadband NIR-II emissions were synthesized by a hydrothermal synthesis combined with a vacuum annealing. For the Ni 2+doped ZGGO samples (x = 0-0.03), with increasing concentration, the particle shape gradually becomes spherical and the average particle size decreases from 124.4 to 74.2 nm. Meanwhile, for the ZGGO:Ni 2+ 0.01 nanoparticles, the asymmetrically broad emission peak around 1290 nm, which is the superposition of the two peaks locating at 1280 and 1450 nm, can be observed and the afterglow time exceeds 30 min. Based on the spectral data, luminescence decay curves, first-principles calculations, and Tanabe-Sugano theory, it is found that Ni 2+ ions can occupy not only tetrahedral but also octahedral Zn 2+ sites (locating in anti-site defects pair) in the spinel ZGGO host, and they have the contributions to the 1450 and 1280 nm emission peaks, respectively. Furthermore, the surface-modified ZGGO:Ni 2+ nanoparticles exhibited good stability in the H 2 O and HSA (5% human serum albumin, pH = 7.4) solutions and the occurred agglomeration sinking in the SLS (simulate lysosomal solution, pH = 4.7) solution. Compared to the narrow-band NIR-II emitting persistent luminescence nanoparticles (ZGGO:Cr 3+ ,Er 3+ and ZGGO:Cr 3+ ,Nd 3+ ), broadband NIR-II emitting persistent luminescence nanoparticles (ZGGO:Ni 2+ NIR-II) possess stronger persistent luminescence intensity and can effectively avoid the water absorption of biological tissues. Our results suggest that ZGGO:Ni 2+ persistent luminescence nanoparticles have a potential to become optical probes for deep-tissue autofluorescence-free bioimaging in the biomedical field.

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Optical spectroscopic study of synthetic NaScSi2O6–CaNiSi2O6 pyroxenes at normal and high pressures

Abstract: Six synthetic NaScSi 2 O 6 -CaNiSi 2 O 6 pyroxenes were studied by optical absorption spectroscopy. Five of them of intermediate (Na 1-x

Cited by 20 publications

References 22 publications

Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Pressure dependence of color of natural uvarovite: the barochromic effect

Doping and luminescence mechanisms of broadband NIR‐II emitting Zn₂₍₁₋_x₎Ni₂_xGa₃Ge_0.75O₈ nanoparticles

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Optical spectroscopic study of synthetic NaScSi2O6–CaNiSi2O6 pyroxenes at normal and high pressures

Abstract: Six synthetic NaScSi 2 O 6 -CaNiSi 2 O 6 pyroxenes were studied by optical absorption spectroscopy. Five of them of intermediate (Na 1-x

Cited by 20 publications

References 22 publications

Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

Pressure dependence of color of natural uvarovite: the barochromic effect

Doping and luminescence mechanisms of broadband NIR‐II emitting Zn2(1−x)Ni2xGa3Ge0.75O8 nanoparticles

Contact Info

Product

Resources

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Doping and luminescence mechanisms of broadband NIR‐II emitting Zn₂₍₁₋_x₎Ni₂_xGa₃Ge_0.75O₈ nanoparticles