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

Abstract

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 degrees C under Argon atmosphere, and for VO2+ doped KH2PO4 at pressure of 100 bars and temperature of 50 degrees 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. (C) 2015 Elsevier B.V. All rights reserved.