Open AccessПрименение высокочастотного ЭПР/ЭСЭ для идентификации примесного состава и электронной структуры керамик на основе гранатов
Author(s) -
E. V. Edinach,
И. А. Успенская,
A. S. Gurin,
R. A. Babunts,
Г.Р. Асатрян,
N. G. Romanov,
А.Г. Бадалян,
П. Г. Баранов
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.10.48262.503
Subject(s) - electron paramagnetic resonance , gadolinium , spectral line , ion , impurity , materials science , chemistry , yttrium , ferromagnetic resonance , nuclear magnetic resonance , analytical chemistry (journal) , magnetization , magnetic field , physics , organic chemistry , quantum mechanics , astronomy , chromatography , metallurgy , oxide
Electron paramagnetic resonance (EPR) spectra of Ce3+, Yb3+, Cr3+, and Gd3+ impurity ions in yttrium aluminum garnet Y3Al5O12 (YAG) ceramics were detected and identified at frequency of 94 GHz. The advantage of measuring the EPR spectra in the high-frequency range compared to the standard EPR technique is shown, which makes it possible to separate the EPR spectra characterized by different anisotropic g-factors and also to isolate the EPR signals due to the splitting of the fine structure for centers with high-spin states. In ceramics with a high content of magnetic Gd3+ ions, EPR and electron spin echo (ESE) spectra of multi-ionic gadolinium complexes were observed, and EPR spectra of complexes with the maximum number of exchange-coupled gadolinium ions are seen at low temperatures. The temperature dependences of the EPR spectra indicates ferromagnetic ordering of exchange-coupled complexes of gadolinium.