Effect of alkaline earths on spectroscopic and structural properties of Cu2+ ions-doped lithium borate glasses

Bhogi, Ashok; Kumar, Rahul; Kistaiah, P.

doi:10.1016/j.jnoncrysol.2015.06.012

Cited by 76 publications

(12 citation statements)

References 49 publications

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“…Although the copper tellurite sample with 15 mol% CuO has some crystalline precipitates of the tetragonal α-TeO 2 phase, it is predominantly amorphous and therefore the neutron diffraction studies provide reliable information about the structural transformations that occur with increase in It is known from neutron diffraction and molecular dynamics studies on amorphous TeO 2 that there are two types of Te-O linkages, the shorter ones at 1•880 Å are due to the Te-O linkages in the equatorial plane, while the longer ones at 2•121 Å are due to Te-O axial linkages and the average bond length is 2•000 Å. (9,14) Neutron diffraction studies on the alkali and heavy metal oxide tellurite glasses found that the Te-O bond length distributions have a peak value at 1•95 Å, (43,64,65) which is in good agreement with the value of 1 5) and are in good agreement with the previous findings, (66) however, Cu 2+ in tellurite glasses have tetra- Bhogi et al (20) and Rao et al (21) reported that Cu 2+ ions in glasses can be in tetrahedral, octahedral and square planar coordination and that at high concentration of CuO (>0•6 mol%) mostly Cu + ions exist. Duran et al reported that Cu 2+ ions in oxide glasses produce green coloured samples.…”

Section: Short Range Structure By Neutron Diffraction and Rmc Simulationssupporting

confidence: 83%

“…Copper can exist as Cu + , Cu 2+ and Cu 0 in oxide glasses. (20)(21)(22) At low concentration of CuO doping in Li 2 O-MoO 3 -B 2 O 3 glasses, it is reported that mostly Cu 2+ are present and that on increasing CuO concentration beyond 0•6 mol%, the Cu 2+ reduce to Cu + . (21) The increase in CuO concentration in the glass series: (35−x)Pb 3 O 4 -xCuO-65Li 2 B 4 O 7 is found to exhibit the structural transformation: BO 4 AEBO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Structure of copper tellurite and borotellurite glasses by neutron diffraction, Raman, 11B MAS-NMR and FTIR spectroscopy

Kaur

Khanna

Krishna

et al. 2020

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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The structure of copper tellurite and borotellurite glasses is studied by x-ray and neutron diffraction, reverse Monte Carlo (RMC) simulations, FTIR, Raman and 11B MAS-NMR spectroscopy. Copper tellurite sample with 15 mol% CuO forms precipitates of tetragonal TeO2 within the glass matrix on melt quenching. The glass forming ability of the xCuO–(100−x)TeO2 system enhances with increase in CuO concentration from 15 to 20 mol% and also with the addition of B2O3. RMC simulations on the neutron diffraction data found that the Cu–O and Te–O bond lengths are approximately at equal distances in the range: 1·96 to 1·98±0·02 Å, while the nearest O–O distance is at 2·71±0·02 Å. Neutron and Raman results on the Te–O speciation are in agreement and confirmed that the Te–O coordination decreases with an increase in CuO and B2O3 molar concentrations in the tellurite and borotellurite glasses, respectively. RMC studies found that Cu2+ has tetrahedral coordination with oxygen, as predicted by Jahn–Teller distortion and that Cu–O and Te–O structural units have very similar size and geometry. The copper tellurite glass-ceramic sample with 15 mol% CuO was heat treated and it formed crystalline precipitates of TeO2 and CuTe2O5 upon devitrification; the average Te–O coordination was significantly smaller in the glass as compared to that in the crystalline sample.

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Section: Short Range Structure By Neutron Diffraction and Rmc Simulationssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Structure of copper tellurite and borotellurite glasses by neutron diffraction, Raman, 11B MAS-NMR and FTIR spectroscopy

Kaur

Khanna

Krishna

et al. 2020

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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“…The theoretical optical basicity (𝛬 𝑡ℎ ) values are increases with increasingK2O content in the alkali borate host materials, it was suggested that the local states (coordination and valence) of transition metal ions in the glass matrix and finally the glass makes color itself. [20]. The nonlinear variation of bandgap and Urbach energy values are shown in Fig.…”

Section: 3optical Basicitymentioning

confidence: 95%

“…Furthermore, additional transition peaks appeared at higher wavenumber region, 1598cm −1 ,1600cm −1 ,1410cm −1 and 1412cm −1 are generated due to the creation of NBO in glass host materials. And also FTIR spectra the wavenumber range from 400 cm −1 to 500 cm −1 is assigned to the bending vibrations of various borate segments and the presence of various specific vibrations of K-O, Na-O, Mg-O and Ba-O, which is also due to bending modes of Cu-O bonds [20,[32][33][34].…”

Section: Ftir Spectramentioning

confidence: 99%

Structural, Optical and Electrical Properties of Copper Doped Alkali Borate Glasses

Srinivas

Komaraiah

et al. 2021

Preprint

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The compositional effect on Physical properties, Optical absorption and Electrical properties of glass composition xK2O - (25-x) Li2O-12.5BaO-12.5MgO-49B2O3-1CuO (x =0, 5, 10, 15, 20 and 25mol %) was prepared by the melt-quenching technique. From optical absorption spectra few parameters, like Urbach energy, indirect allowed, reflection loss (R), refractive index (n), molar polarizability(αm) molar refractivity (Rm), and theoretical optical basicity (Λth) values of prepared glass samples were measured. The values of Rm, αm, and Λth were increase with increasing of x mol%. The Eopt, R, and n values were changed very small with x mol%, which may be due to the non-bridging oxygen’s moments in the glass matrix. The FTIR spectrum of prepared borate glasses indicates that the influence of BO3 and BO4 units of boron atoms. The explicit vibrational peaks were exhibited of Li–O, K–O, Mg–O, and Ba–O bonds in glass network, and A.C conductivity study was devised to know the structural information about the glass network. The drastic change in the ionic conductivity as a function of the alkali content in the glass composition was analyzed by considering both the ionic mobility and the glass structure. Some physical, optical, and electrical values varied non-linearly with the K2O content, which may influence of non- bridging oxygens or mixed alkali effect.

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“…The electrical conductivity, stability, and wide glass forming range of vanadate glasses produced with PbO make them especially attractive. When vanadium is coupled with a stronger glass former, such as B 2 O 3 or P 2 O 5 , a more stable network can be created [ 7 , 8 , 9 , 10 , 11 ]. Copper, as is well known, has a broad selection of applications due to factors such as being incomparable in terms of electrical conductivity after silver among all metals.…”

Section: Introductionmentioning

confidence: 99%

Newly Developed Vanadium-Based Glasses and Their Potential for Nuclear Radiation Shielding Aims: A Monte Carlo Study on Gamma Ray Attenuation Parameters

et al. 2021

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This study aimed to investigate different types of glasses based on the 46V2O5-46P2O5-(8-x) B2O3-xCuO system in terms of their nuclear radiation shielding properties. Accordingly, five different CuO-doped vanadate glasses were investigated extensively to determine the necessary gamma shielding parameters along with effective conductivity at 300,000 and buildup factors. Phy-x PSD software was used for determination of these vital parameters. Furthermore, these parameters, such as half value layer, tenth value layer, and mean free path were investigated in a broad energy range between 0.015 and 15 MeV. The results revealed that the amount of CuO reinforced in each sample plays an essential role in determination of the shielding abilities of the samples. The sample with the highest CuO content had the highest linear attenuation coefficient and mass attenuation coefficient values. Additionally, the lowest mean free path, half value layer, and tenth value layer values were recorded for glass sample VPCu8. There was an inverse relation between the effective conductivity and effective atomic number and photon energy; that is, as energy increases, the effective conductivity and effective atomic number decreased rapidly, especially in the regions of low energy. Glass sample VPCu8 reported the highest values for both parameters. Moreover, glass sample VPCu8 had the lowest exposure buildup factor and energy absorption buildup factor values. Our findings showed that CuO-reinforced vanadate glass composition, namely 46V2O5-46P2O5-8CuO, with a glass density of 2.9235 g/cm3, was reported to have superior gamma ray attenuation properties. These results would be helpful for scientists in determining the most appropriate additive rare earth type, as well as the most appropriate glass composition, to offer shielding characteristics similar to those described above, taking into consideration the criteria for usage and the needs of the community. The results of this research will be useful to the scientific community in evaluating the prospective characteristics of CuO-doped glass systems and related glass compositions. CuO-doped glass systems and associated glass compositions have a wide range of properties.

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Effect of alkaline earths on spectroscopic and structural properties of Cu2+ ions-doped lithium borate glasses

Cited by 76 publications

References 49 publications

Structure of copper tellurite and borotellurite glasses by neutron diffraction, Raman, 11B MAS-NMR and FTIR spectroscopy

Structure of copper tellurite and borotellurite glasses by neutron diffraction, Raman, 11B MAS-NMR and FTIR spectroscopy

Structural, Optical and Electrical Properties of Copper Doped Alkali Borate Glasses

Newly Developed Vanadium-Based Glasses and Their Potential for Nuclear Radiation Shielding Aims: A Monte Carlo Study on Gamma Ray Attenuation Parameters

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