EPR, optical and physical properties of chromium ions in CdO–SrO–B2O3–SiO2 (CdSBSi) glasses

Kumar, J.; Kumari, Jyoti; Rao, M. Subba; Cole, Sandhya

doi:10.1016/j.optmat.2013.01.012

Cited by 70 publications

(6 citation statements)

References 51 publications

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“…Secondly, the cross section for incoherent photon scattering s IC and pair production absorption s PP are responsible for the energy variation of ( m r / ) for 0.6<E6 MeV and 6E10 MeV respectively. Hence, the high but rapidly declining values of m r ( / ) at the s PA dominated energies is due to the fact that the PA process completely absorbs photon via the creation of photoelectrons and also due to s µ -E PA 3 dependence. On the other hand, the incoherent photon scattering process does not completely absorb photons but rather scatters them hence, the relatively lower attenuation coefficients in the s IC dominated energy region.…”

Section: Photon Shielding Parametersmentioning

confidence: 99%

“…Borate glasses have become interesting materials because of their rare earth metal/ion (REM/I) solubility, cheap and easy fabrication techniques, resistant to moisture, chemically stable, high melting temperature et al of which have made them advantageous for many technological applications [2][3][4][5]. Furthermore, borate glasses doped with bismuth oxide are also interesting materials for advanced technological applications due to their outstanding properties compared to other host matrices such as tellurite, silicates and phosphates.…”

Section: Introductionmentioning

confidence: 99%

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A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system

Alzahrani¹,

Alrowaili²,

Somaily³

et al. 2022

Phys. Scr.

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This study presents the shielding parameters for directly and indirectly ionisation radiation of PCBBC glasses with the chemical composition: xPbF2–(25-x)CaF2–49.8B2O3–25Bi2O3–0.2Cr2O3 and coded as PCBBC1 – PCBBC4 for x= 0, 5, 15, and 25 respectively. Photon shielding coefficients were estimated by Monte Carlo simulation method via FLUKA code and by XCOM calculations for energies ranging from 0.1 – 10 MeV. In addition, the total stopping powers (TSP) and projected range (R) of electron (e^(-1)), proton (p^+), alpha particle (α), and carbon ion (C^+)) were used to investigate the shielding ability of the glasses against charged particles while fast "Σ" _"R" and thermal σT neutron cross sections were also estimated for the investigated glasses. For PCBBC1 – PCBBC4, linear (mass) attenuation coefficient varies from 16.346 (3.571) – 0.170 (0.037), 17.151 (3.723) – 0.173 (0.038), 20.128 (3.987) – 0.194 (0.038), and 22.972 (4.209) – 0.213 cm-1 (0.039 cm2g-1) respectively. At the peak energy, half value layer was 3.879, 3.782, 3.343, and 3.013 cm corresponding to PbF2 molar content increase from 0 – 25% in the PCBBC glasses. Generally, effective atomic number (electron density) Z_eff(N_eff) vary with energy within the range of 18.49 -71.75 (2.93 – 11.37), 19.35 – 72.68 (2.92 – 10.98), 21.04 – 74.18 (2.91 – 10.25), and 22.70 – 75.34 (2.89 9.600 N_A electrons/g). values of TSP and R follows the order: PCBBC1 > PCBBC2 > PCBBC3 > PCBBC4. "Σ" _"R" changed from 0.09989 – 0.10358 cm-1 with PCBBC4 having the maximum value while σT grows from 95.14954 – 113.45969 cm-1 for PCBBC1 – PCBBC4 respectively. Compared to conventional glass shields PCBBC4 glass possess superior shielding ability and it is a potential material for radiation shielding applications in emerging radiation-based technology.

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Section: Photon Shielding Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system

Alzahrani¹,

Alrowaili²,

Somaily³

et al. 2022

Phys. Scr.

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“…According to the Landry theory, the spectrum on the lower field side (g ≈ 4.3) is from the isolated ions of chromium, whereas the high field side (g ≈ 1.99) is due to exchange coupled pairs Cr 3+ -Cr 3+ . [53][54][55] Noticeable change in g values is not observed, but nonlinear reduction in the intensity of the EPR spectra at g ≈ 2.0, i.e., in the high field region, has been noticed as we move from CZBBCR1 to CZBBCR5 glass sample. Hence, on increasing CaF 2 concentration, interaction of the exchange coupled pairs of chromium ions decreases.…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications

Haritha

Sekhar

Nagaraju³

et al. 2019

Chinese Phys. B

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Fluoride based glasses with composition CaF 2 -ZnF 2 -Bi 2 O 3 -B 2 O 3 doped with chromium ions have been investigated using physical, optical, electron paramagnetic resonance (EPR), Fourier-transform infrared spectroscopy (FTIR), and Raman studies. The amorphous nature of samples was confirmed from x-ray diffraction spectra. The density is evaluated from the Archimedes principle and the values of optical band gap and Urbach energy values were evaluated from the optical absorption spectra. Thus, molar volume, refractive index, etc., were also evaluated. The observed decrease in density and the optical band gap with CaF 2 is explained using the crystalline density of metal fluorides and the ionicity of fluorine ions, respectively. The three peaks near 450 nm, 606 nm, and 720 nm, which are shown in the absorption spectra, are accredited to 4 A 2g → 4 T 1g , 4 A 2g → 4 T 2g , 4 A 2g → 2 E transitions, respectively. Resonance signals at g ≈ 4.82 and g ≈ 1.99 were observed in EPR spectra which are assigned. FTIR and Raman analysis were carried out to examine the impact of metal fluorides on the structure of bismuth borate glasses.

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“…TM cations show remarkable variations in the glass properties, which paves the way for novel applications of such glasses [3]. In particular, cadmium oxide (CdO), an n-type semiconductor TM oxide, acquires motivating features for improving glasses properties, like wide band gap, high transparency and lower resistivity [4]. In more detail, CdO comprising glasses have great avails due to their great applications in various fields.…”

Section: Introductionmentioning

confidence: 99%

Optical and radiation shielding features of NiO-CdO-BaO borosilicate glasses

et al. 2022

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We report on the optical and radiation shielding features of NiO-CdO-BaO borosilicate glasses in the UV-Vis-NIR range. The presence of Ni2+ cations in the octahedral site is emphasized by the absorption band at about 434-462 nm originating from 3A2g(F) → 3T1g(P) electronic transitions in the visible range. Also, this absorption band makes the present glass samples good candidates for optical filter applications within the visible range. Moreover, the most remarkable absorption band at about 966–986 nm due to Ni2+ cations in the tetrahedral site; 3T1(F) → 3A2(F) electronic transitions. The noticed increase in this absorption band reflects the increased heat-absorbing ability of the present glasses with further NiO doping. This result makes the present glass samples possible for solar thermal collectors. The reduction of the optical band gap (Eg) values from 3.16 to 2.95 eV can be explained by the creation of nonbridging oxygens produced by the existence of Ni2+ cations in the octahedral site. The electronic polarizability (α0 -2) and optical basicity (˄ th ) values showed a slight increase with a further increase in the NiO: CdO ratio. The values of metallization criterion (M) decreased from 0.397 to 0.384 with more concentrations of NiO which agrees with the obtained data for E g. The third-order nonlinear susceptibility (χ(3)) and nonlinear refractive index (n 2) values introduced an increment behavior with more concentrations of NiO. This behavior can be justified by the decreasing behavior of E g. On the other hand, our glass samples are good attenuators against the low energy radiation, since the linear attenuation coefficient is high (from 0.449 to 0.442 cm-1) at 0.284 MeV.

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EPR, optical and physical properties of chromium ions in CdO–SrO–B2O3–SiO2 (CdSBSi) glasses

Cited by 70 publications

References 51 publications

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system

Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications

Optical and radiation shielding features of NiO-CdO-BaO borosilicate glasses

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EPR, optical and physical properties of chromium ions in CdO–SrO–B2O3–SiO2 (CdSBSi) glasses

Cited by 70 publications

References 51 publications

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF2-CaF2-Bi2O3-B2O3-Cr2O3 glass system

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF2-CaF2-Bi2O3-B2O3-Cr2O3 glass system

Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications

Optical and radiation shielding features of NiO-CdO-BaO borosilicate glasses

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A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system

A broad analysis of directly and indirectly ionizing radiation interaction parameters of PbF₂-CaF₂-Bi₂O₃-B₂O₃-Cr₂O₃ glass system