Sr_0.33Ba_0.67Nb₂O₆:Cr (0.02mol.%) single crystals have been prepared by Czochralski method. They were investigated by electron paramagnetic resonance (EPR) and photoluminescence (PL)  in a temperature range of 3-300 K. EPR signal shows at least two magnetically nonequivalent centers and some features characteristic of dissimilar ion pairs transitions, that are found from EPR roadmap at high magnetic fields (over 4000 Gs).

PL spectra reveal two separated bands centered at 544 and 766 nm, that are due to chromium ions in disordered matrices. The 544 nm broad band shows a little temperature dependence and has several sharp lines at high-energy side. The 766 nm band is sharp and the intensity dramatically decreases with increasing temperature up to 100 K.

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