Solid State Ionics, Vol.72, 285-288, 1994
Electrical-Impedance and Ultrasonic Velocity of Sodium Ionic Conductor Na1+2Xzr2-Xmgx(PO4)(3)
In the complex impedance representation, we observed either one or two semicircles strongly dependent on x, and a transition from one semicircle to two semicircles at x = 0.4. Ultrasonic velocity showed an anomaly at x = 0.4. Owing to this fact, we observed the bulk conduction and grain boundary diffusion.