EPR characterization of erbium in glasses and glass ceramics

Abstract

Electron paramagnetic resonance (EPR) is a well-established spectroscopic technique for electronic structure characterization of rare-earth ion impurities in crystalline and amorphous hosts. EPR spectra of erbium-doped glass matrices and nanocomposites can provide information about local structure variations induced by changes in chemical composition or crystallization processes. Characterization possibilities of Er3+ ions in glasses and glass ceramics including direct EPR measurements, indirect investigations via secondary paramagnetic probes, and optically detected magnetic resonance techniques are considered in this article.

Peculiarities Related to Er Doping of ZnO Nanorods Simultaneously Grown as Particles and Vertically Arranged Arrays

“…The EPR signal at the g factor ≈ 11.54 (corresponds to the resonance magnetic field 581 G) has been measured only for the ZnO:Er(1%) NRF, as shown in Figure S3 in the Supporting Information. The g ≈ 11.54 resonance line of ZnO:Er(1%) NRF has the glass-like line shape, as has also been reported in the previous works (see, e.g., refs and ). It has previously been attributed to Er 3+ (4 f 11 ) in the free-standing ZnO:Er microrods. , The glass-like shape of the signal is in good agreement with the SEM and XRD findings above; i.e., erbium nucleation seeds should have nonoriented, not regular character in the ZnO NRF.…”

Hyperfine interactions and coherent spin dynamics of isotopically purified 167Er3+ in polycrystalline Y2O3

“…Simulation of the experimental spectra with even isotope 166 Er 3+ (33.5% natural abundance) using the above listed parameters for the parallel component of the axially symmetric signal (C 3i ) perfectly matched observed transitions and signal's intensity. The average g avg factors for both C 2 and C 3i systems were found to be 6.243, suggesting Γ 7 ground state (g ave = 6.0) rather than Γ 6 (g ave = 6.8) usually found in Er 3+ doped samples [17][18][19].…”