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Electron Paramagnetic Resonance (EPR) and Optical Absorption Spectra of Cu²⁺ Ions in (30-X) NaF-xAl₂ O₃ - 69B₂O₃ -1Cuo Glasses

B. Ashok*, Abdul Hameed**, B. Srinivas***, Gokarakonda Ramdevudu ****, M. Narasimha Chary *****, Md. Shareefuddin ******

*,***,*****-****** Department of Physics, Osmania University, Hyderabad, Telangana, India.

** Department of Physics, Nizam College, Hyderabad, Telangana, India.

**** Department of Physics, Vasavi College of Engineering, Hyderabad, Telangana, India.

Periodicity:July - September'2020
DOI : https://doi.org/10.26634/jms.8.2.16193

Abstract

Sodium fluoro alumino borate glasses with composition (30-x) NaF-xAl₂O₃-69B₂O₃-1CuO (where x=0, 5, 7, 10, 12, 15 mol %) were prepared by melt quenching method in which Cu²⁺ ions are acting as spin probe. EPR spectra were recorded at X - band frequencies with 100 kHz field modulation at room temperature and its resonance peaks shows Cu²⁺ ions characteristics. From calculated spin Hamiltonian parameters, it has been observed that g_∥>g_⊥>g_e (g_e =2.0023 for free electron) and A_∥ >A_⊥ indicated that the site around transition metal ion (TM) i.e., Cu²⁺ion is tetragonally distorted octahedral and its ground state is d²_x - y² orbital (²B_1g state). The number of unpaired Cu²⁺ ion spins (N_i) participating in resonance and the paramagnetic susceptibility (χ) were also evaluated. Glass composition is also a important factor and its effect shows the variation in spin Hamiltonian parameters. A middle broad absorption (²B_1g→ ²B_2g) band is observed at 770 nm in the optical spectra. Calculated bonding coefficient revealed the bonding nature between TM ion and its ligand.

Keywords

Oxy-Flouride Glasses, EPR Spectra, Orbital, Copper

How to Cite this Article?

Ashok, B., Hameed, A., Srinivas,B., Ramdevudu, G., Chary, M. N., and Shareefuddin, M. (2020). Electron Paramagnetic Resonance (EPR) and Optical Absorption Spectra of Cu²⁺ Ions in (30-X) NaF-xAl₂ O₃ - 69B₂O₃ -1Cuo Glasses. i-manager's Journal on Material Science, 8(2), 9-15. https://doi.org/10.26634/jms.8.2.16193

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Electron Paramagnetic Resonance (EPR) and Optical Absorption Spectra of Cu2+ Ions in (30-X) NaF-xAl2 O3 - 69B2O3 -1Cuo Glasses