High-Temperature Electrical Conductivity of Aluminum Oxynitride Spinel

The electrical conductivity of pure aluminum oxynitride spinel was measured at 1300° to 1500°C under flowing nitrogen gas. The re sults for two nonstoichiometric spinel compositions can be fitted by exponential expressions with an activation energy of 116± I Wlmol. The mobilities calculated from aluminum vacancy concentrations and conductivities, 8.07x cm'/V-s, are reasonable for ionic conduction. The complex impedance plot suggests electrode double-layer effects being damped out at higher frequencies in the range 10'to lo4 Hz.