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Lanthanide Ions as Local Probes in Ionic Hydrides: A Pulsed Electron Nuclear Double Resonance and Thermoluminescence Study of Eu²⁺-Doped Hydride Perovskites

Wylezich, Thomas, Böttcher, Rolf, Sontakke, Atul D., Castaing, Victor, Viana, Bruno, Pöppl, Andreas, Kunkel, Nathalie
Journal of physical chemistry 2019 v.123 no.8 pp. 5031-5041
barium, electron paramagnetic resonance spectroscopy, europium, hydrides, ions, models, physical chemistry, strontium, thermoluminescence
A model study on the use of pulsed electron paramagnetic resonance spectroscopy and optical spectroscopy of Eu²⁺ as a local probe in hydrides is presented for the Eu²⁺-doped (and codoped) perovskites LiMH₃ and LiMD₃ (M = Sr or Ba). Two-pulse field-swept electron spin echo, Davies and Mims electron nuclear double resonance, Davies-type difference triple resonance experiments, and thermoluminescence spectroscopy, as well as density functional calculations, were carried out. Electron nuclear double resonance spectroscopy allows for an unambiguous determination of the position occupied by the dopant ion, which is important information necessary for the correct interpretation of optical spectra. With regard to the current importance of hydrides and mixed anionic hydrides, doping with rare-earth or transition-metal ions and the combination of pulsed EPR and optical spectroscopy may serve as a promising and convenient tool for studying such materials.