Multimodal Spectroscopic Analysis of Quaternary Selenium Borate Glasses with Transition Metal Ions
摘要
Selenium borate glasses containing rare-earth oxides 70B2O3–22.5 Bi2O3–5SeO2–0.5RO-2MO (RO = Sm2O3, CeO2, Dy2O3 and MO = MnO, CuO, NiO) were synthesized using the conventional melt quenching method. The samples prepared were confirmed as amorphous by x-ray diffraction (XRD) patterns in which no peaks were observed. Electron paramagnetic resonance (EPR) spectra of the spin probes doped with 2.0 mol.% of CuO, MnO, and NiO were analyzed at room temperature. The spin-Hamiltonian parameters of all the spin probes and their variations have been discussed. EPR studies revealed Mn2+ ions in rhombic environments with a distorted crystal field. In sample B, Cu2+ ions occupied distorted octahedral sites with ground state dx2−y2, whereas in sample C, Ni2+ and Ni3+ ions were positioned in interstital locations and elongated octahedral positions, respectively. Fourier transform infrared (FTIR) and Raman spectroscopy findings specified that the glass structure contains various randomly distributed borate groupings, such as [BO3] and [BO4] units, along with [BiO3] and [BiO6] units.