Dielectrics

Identification of paramagnetic centers of gadolinium and iron in scandium and yttrium orthosilicates

V. A. Vazhenin^a, A. P. Potapov^a, K. A. Subbotin^bc, A. V. Fokin^a, M. Yu. Artemov^a, A. I. Titov^bc, S. K. Pavlov<sup>bc

a</sup> Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, Russia
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
^c D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia

Abstract: The study of grown Sc$_2$SiO$_5$ : Gd и Sc$_2$SiO$_5$ : Fe crystals was carried out by the paramagnetic resonance method. It has been established that Fe$^{3+}$ ions replace Sc$^{3+}$ in both crystallographic positions, while Gd$^{3+}$ ions exhibit a single center localized in a larger position with a coordination number of 7. Measurement of the orientational behavior of the positions of transitions of Fe$^{3+}$ and Gd$^{3+}$ centers in two orthogonal planes made it possible to determine the parameters of their triclinic spin Hamiltonians. To determine the localization of impurity ions Cr$^{3+}$, Fe$^{3+}$ and Gd$^{3+}$ in scandium and yttrium silicates, the orientation of the main $Z$ axes of the fine structure tensors of the second rank was used.

Keywords: scandium and yttrium silicates, impurity ions, paramagnetic resonance.

Received: 27.03.2023
Revised: 27.03.2023
Accepted: 28.03.2023

DOI: 10.21883/FTT.2023.05.55494.45

Bibliographic databases:

•