The EPR study of Mn(2+) ion doped KBr and VO(2+) ion doped KH2PO4 under high pressure

Abstract

In previous works under open atmosphere at various temperatures KBr host crystal never accepted paramagnetic Mn(2+) ion in its lattice, but KH2PO4 host crystal accepted VO(2+) ion in its lattice where K(+) ion substituted with VO(2+). In a series of works using high-pressure reactor at various pressures and temperatures under different gas atmospheres, Mn(2+) ion was inserted in KBr host, and VO(2+) ion was inserted in KH2PO4 host in sites different from those observed in previous works. The best results were obtained for Mn(2+) doped KBr at pressure of 100bars and 50°C under Argon atmosphere, and for VO(2+) doped KH2PO4 at pressure of 100bars 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.

Keywords: Argon atmosphere; EPR; High-pressure reactor; Oxygen atmosphere; UV–Vis.