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 KH<inf>2</inf>PO<inf>4</inf> 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 KH<inf>2</inf>PO<inf>4</inf> 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 KH<inf>2</inf>PO<inf>4</inf> 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. © 2015 Elsevier B.V. All rights reserved.