Charge trapping phenomena and recombination centers were studied in three Cs 2 HfCl 6 single crystals of slightly different stoichiometry grown by the vertical Bridgeman method. Electron paramagnetic resonance (EPR) spectra measured both before and after X-ray irradiation show creation of two distinct V k centers. One of them was V k (a) already known from a recent work by "R.
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