Comparative investigation on the effect of alkaline earth oxides on the intensity of absorption bands due to Cu2+, Mn3+ and Cr3+ ions in ternary silicate glasses

Singh, Shailendra; Aman, .; Tarafder, Anal

doi:10.1007/bf02708518

Cited by 20 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With increasing glass basicity, the absorption density of Mn 3+ band (A/d Mn 3+ in cm -1 ) computed by using (2) was increased at almost constant position. Similar results were found in silicate glasses with different alkali contents (Singh et al 2004). The increase of A/d Mn 3+ caused the colour intensity of the experimental glasses to change clearly from pale purple to dark purple.…”

Section: Investigation Of Redox Ratio Rsupporting

confidence: 86%

See 1 more Smart Citation

Redox ratio and optical absorption of polyvalent ions in industrial glasses

et al. 2007

View full text Add to dashboard Cite

The changes in glass structure and redox ratio, R (reduced ion to oxidized ion) of Mn 2+ -Mn 3+ , Cu + -Cu 2+ , Cr 3+ -Cr 6+ , Ni 2+ -Ni 3+ and Co 2+ -Co 3+ couples and optical absorption due to Mn 3+ , Cu 2+ , Cr 3+ , Ni 2+ and Co 2+ ions in industrial soda-lime-silica glass were investigated as a function of Na 2 O concentration in the range 11-19 mol%. With increasing Na 2 O concentration in the experimental glasses, the basicity, expressed as calculated basicity, Λ cal , increased. 29 Si NMR and X-ray diffraction were used to investigate the structural change in glasses. The NMR spectra showed high non-bridging oxygens (NBOs) when the basicity of glass was increased. The results were interpreted to be due to the tetrahedral networks; Q 4 species were depolymerized by replacing the bridging oxygens (BOs) with NBOs to Q 3 species. These results confirmed the shift of broadening peaks of XRD patterns. The redox reactions of the Mn 2+ -Mn 3+ , Cu + -Cu 2+ and Cr 3+ -Cr 6+ couples shifted more toward their oxidized ions due to the oxygen partial pressure, p(O 2 ), during melting and the oxide ion activity, a O2-, increased with increasing glass basicity. These changes caused the redox ratio of these ion couples to decrease. The Ni 2+ -Ni 3+ and Co 2+ -Co 3+ couples were assumed to be present only in the Ni 2+ and Co 2+ ions in these glasses, respectively. The optical absorption bands due to Mn 3+ , Cu 2+ , Cr 3+ , Ni 2+ and Co 2+ ions were also investigated. Their spectra occurred at constant wavelengths with different optical densities or intensities as a function of glass basicity. The increase in the intensities of the absorption bands of these absorbing ions, except for Cr 3+ ion, at the maximum wavelength, depends not only on the ion concentration but also on the increase of polarizability of oxide (-II) species, α oxide(-II) , surrounding the ions. This value affected directly the extinction coefficients of the ions, ε ion . The increase of ε ion caused the colour of glasses appearing in high intensity. In the case of Cr 3+ ion, the results were reversed such that the lower the concentration, the higher the intensities of colour.

show abstract

Section: Investigation Of Redox Ratio Rsupporting

confidence: 86%

“…Figure 5 shows the absorption spectra of glass containing copper with different glass basicities. In general, the main broad band of Cu 2+ ion was at 755 nm and near 800 nm in an octahedral site (Singh et al 2004). The figure shows raising of A/d Cu 2+ due to the oxidation of some Cu + ions to Cu 2+ ions.…”

Section: Investigation Of Redox Ratio Rmentioning

confidence: 96%

Redox ratio and optical absorption of polyvalent ions in industrial glasses

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Such features can be (i) quite weak Fe 3+ -and Fe 2+ -related bands such as those found [38] to occur in the absorption spectrum of Na 2 O-MgO-CaOSiO 2 glass around 26400 and 31600 cm -1 , respectively, (ii) a band around 27000 cm −1 due to the impurity Cr 6+ ion [28], and (iii) bands in the 20,000 to 23,300 cm -1 region due to some other typical coloring ions such as V 5+ , Cr 3+ , Mn 3+ , Co 2+ , and Ni 2+ (see, for example, [54,55]) presenting in trace amounts. Visually, we found no perceptible signs of particular bands in the above regions.…”

Section: Discussionmentioning

confidence: 99%

Quantitative UV–VIS spectroscopic studies of photo-thermo-refractive glasses. I. Intrinsic, bromine-related, and impurity-related UV absorption in photo-thermo-refractive glass matrices

Efimov

Ignatiev

Никоноров

et al. 2011

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…In the present study SrO-ZnO-B 2 O 3 is of particular interest because it is transparent from the ultraviolet to the middle infrared region. Many authors [16][17][18][19] have studied the structure, optical, electrical and thermal techniques in various alkaline earth borate glasses doped with different transition and rare earth metal ions. Transition metal ions are being greatly used in the present days to probe the glass structure since their outer d-electron orbital function has a broad radial distribution and due to their high sensitive response to the changes in the actions [8].…”

Section: Introductionmentioning

confidence: 99%