Establishment of Dipole Equilibrium V²⁺ Doped NaCl

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Electron paramagnetic resonance techniques have been applied to investigate the variation of population distribution with temperature and time between nearest and next nearest neighbour V²⁺-vacancy dipoles. The process involves the rate W₃ at which a next nearest vacancy interchanges its position with a particular nearest neighbour Na⁺, and the rate W₄ of the inverse process to that of W₃. 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 W₃=A₃ exp (−E₃⁄kT) and W₄=A₄ exp (−E₄⁄kT) with the values: A₃=3.45×10^9±0.3s⁻¹, A₄=1.27×10^10±0.3s⁻¹, E₃=0.4876±0.010 eV and E₄=0.5051±0.010 eV.