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Abstract
A complete solid solution Ca1−xNa2xTi4(PO4)6 was prepared between CaTi4(PO4)6 and Na2Ti 4(PO4)6 belonging to the NASICON structural family. The space group evolves from R3 for x⪕0.5, to R3c for x>0.5. For each composition, conductivity values obey the Arrhenius law. From the two end members, cationic substitution improves the conductivity which reaches a maximum for x⋍0.5. The structure of CaTi4(PO4)6 was refined in the R3 space group applying the Rietveld method to the X- ray powder spectra. The Ca2+ cations and vacancies are ordered along the hexagonal c direction. A correlation is proposed between conductivity results and structural features.
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