| Autor: |
Maalegoundla, Chandrasekhar, Hameed, Abdul, Ramadevudu, G., Shareefuddin, Md. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2023, Vol. 2839 Issue 1, p1-6, 6p |
| Abstrakt: |
Melt quenching process was used to synthesize glasses doped with copper ions in the composition (30-x) PbF2−xAl2O3-10Bi2O3-59B2O3-1CuO (where x=3,6,9,12, & 15 mol%). The samples were made by varying Al2O3 content with PbF2 and all the samples were characterized by XRD, UV-Vis spectroscopy and electron paramagnetic resonance (EPR) technique. The density, molar volume, and refractive index have been evaluated. XRD patterns revealed that all the glass samples are non-crystalline nature. With increasing aluminum content, density is found to decrease from 4.58 g/ cm3 to 4.10 g/ cm3 while molar volume increased from 41.40 cc / mol to 42.05 cc / mol. UV-Vis spectra recorded a broad absorption band around 740 nm in all the samples. The optical band gap and Urbach energy were both observed to rise as aluminum content is increased. EPR studies revealed that Cu2+ions are in an octahedral position with an elongated tetrahedron along the z-axis, as it evident from by spin-Hamiltonian parameters (g∥︀ > g⊥ > ge) (ge = 2.0023) and (A‖ > A⊥) which also indicated that the dx2−y2 orbital (2B1g state) as the ground state of Cu2+ion. The bonding coefficients (α2) in-plane σ-bonding, (β2) in-plane π-bonding and (β21) out of plane π-bonding. Bonding coefficients values are varying non -linearly but all are ionic in nature. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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