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Ionic conductivity of the Na1+xM IIIx Zr2−x(PO4)3 systems (M = Al, Ga, Cr, Fe, Sc, In, Y, Yb)

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Abstract

The existence and ionic conductivity of solid solutions Na1+xM IIIx Zr2−x(PO4)3 with Nasicon-like structure have been investigated and the results compared with literature data. A limited range of solid solutions is formed with MIII = aluminium, gallium, yttrium, ytterbium, whereas a continuous series is obtained for MIII = chromium, iron, scandium, indium. The pure end member Na3ln2(PO4)3 is reported for the first time; according to powder diffraction data, it is hexagonal witha = 0.8966(1) andc = 2.2104(4) nm. The small monoclinic distortion already known for MIII = chromium, iron and scandium is restricted tox values very close to 2. Ionic conductivity measurements show that for a given value ofx, the mobility of the Na+ ions is strongly influenced both by the ionic radius and the type of electronic structure of the MIII ion. However, no simple correlation can be found.

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Winand, J.M., Rulmont, A. & Tarte, P. Ionic conductivity of the Na1+xM IIIx Zr2−x(PO4)3 systems (M = Al, Ga, Cr, Fe, Sc, In, Y, Yb). J Mater Sci 25, 4008–4013 (1990). https://doi.org/10.1007/BF00582473

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