Earlier it has been shown that in the lithium heptagermanate Li 2 Ge 7 O 15 structure the chromium doping ions substitute the germanium hosts and create Cr 3+ -Li + pair centres. In the paper EPR and dielectric spectra of Li 2 Ge 7 O 15 :Cr 3+ crystal are studied in the temperature range 300 ÷ 500 K. The thermally activated reorientation of Cr 3+ -Li + pairs has been detected through EPR line width broadening and dielectric relaxation.
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