The EPR study of Mn2+ ion doped KBr and VO2+ ion doped KH2PO4 under high pressure

• Mn2+ doped KBr and VO2+ doped KH2PO4 single crystals grown in high pressure reactor was studied.
• The A and g values of the paramagnetic centers and the electronic transitions were determined.
• Using the values determined from spectra, structures and molecular orbital parameters were found.

In previous works under open atmosphere at various temperatures KBr host crystal never accepted paramagnetic Mn2+ ion in its lattice, but KH2PO4 host crystal accepted VO2+ ion in its lattice where K+ ion substituted with VO2+. In a series of works using high-pressure reactor at various pressures and temperatures under different gas atmospheres, Mn2+ ion was inserted in KBr host, and VO2+ ion was inserted in KH2PO4 host in sites different from those observed in previous works. The best results were obtained for Mn2+ doped KBr at pressure of 100 bars and 50 °C under Argon atmosphere, and for VO2+ doped KH2PO4 at pressure of 100 bars and temperature of 50 °C under oxygen atmosphere. The structural parameters of paramagnetic species formed were determined by EPR spectroscopy and optical transitions were determined by UV–Vis spectroscopy.

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