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Li 1 + x Hf 2 -x Sc x (PO 4 ) 3 (x = 0-0.3) NASICON type mixed phosphates have been synthesized and characterized by X ray diffraction, nuclear magnetic resonance, and impedance spectroscopy. The results demonstrate that the materials with 0 ≤ x ≤ 0.1 have a hexagonal structure, whereas in the range 0.1 < x ≤ 0.2 the materials consist of a mixture of hexagonal and orthorhombic phases. The x = 0.3 material has an orthor hombic NASICON structure. Doping with scandium leads to an increase in ionic conductivity in the range 0 < x ≤ 0.1.

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