Establishment of Dipole Equilibrium V2+Doped NaCl

Abstract

Electron paramagnetic resonance techniques have been applied to investigate the variation of population distribution with temperature and time between nearest and next nearest neighbour V 2+ -vacancy dipoles. The process involves the rate W 3 at which a next nearest vacancy interchanges its position with a particular nearest neighbour Na + , and the rate W 4 of the inverse process to that of W 3 . The processes were investigated in the temperature range from 20°C down to -110°C. The jumping frequencies can be expressed in the Arrhenius forms W 3 = A 3 exp ( - E 3 / k T ) and W 4 = A 4 exp ( - E 4 / k T ) with the values: A 3 =3.45 ×10 9±0.3 s -1 , A 4 = 1.27 ×10 10±0.3 s -1 , E 3 =0.4876±0.010 eV and E 4 =0.5051±0.010 eV.