Abstract
Longitudinal ultrasonic wave velocity and attenuation and also complex electric conductivity temperature and frequency dependencies have been measured in superionic Na 3Zr 2Si 2PO 12. At phase transition near T c=450 K the minimum of ultrasonic velocity and attenuation peak as well as two regions of ultrasonic relaxation in room temperature phase have been observed. The comparison of acoustic and electric measurements indicated that one of the relaxations is caused by acoustoionic interaction inside crystallites and the other by modulation of intercrystalline barriers.
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