Abstract
We have determined the low temperature heat capacity of NASICON type compounds Na3Cr2P3O12 and Na3ZrMgP3O12 by adiabatic calorimetry from 8 to 300 K. The lattice contributions are estimated from a combination of Debye and Einstein functions. The excess entropy due to Na+ ion disorder is found to be lower in the chromium compound in agreement with the relative ionic conductivities at 300 K. A disorder model in Na3M2P3O12 (M=Fe, Cr) is proposed that takes into account the occupancy factors of Na+ on different available sites.
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