Abstract
The quadrupole interaction experienced by the 181Ta nucleus placed in substitution for Zr in the Na3 Zr2 Si2 P O12 compound (NASICON) has been determined from gamma-ray angular correlation experiments in the temperature range 20–700°C. The asymmetry of the electric field-gradient tensor vanishes for T ʐ 200°C, which is an indication for a non-random substitution of Si4+ for P5+ ions and a high mobility of both Na(1) and Na(2) species in the rhombohedral structure. Furthermore, the results are consistent with the idea that the transition from a monoclinic to a rhombohedral structure is accompanied by a transfer of sodium ions from static intersticial positions into partially occupied Na(1) and/or Na(2) positions.
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