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The Origin of Phase Transition and the Usual Evolutions of the Unit-Cell Constants of the NASICON Structures of the Solid Solution LiTi2 – xGex(PO4)3

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Abstract

Ge-doped LiTi2(PO4)3 has been synthesized by a conventional solid-state reaction. Compounds LiM\(_{2}^{{{\text{IV}}}}\)(PO4)3 with LTP-type structure present a different behaviour depending on nature of M(IV). For M(IV) = Ti and Ge, the structure shows the space group R3c, whereas for M(IV) = Ge the space group is R3. Differences in behaviour of LiTi2(PO4)3–LiGe2(PO4)3 solid solutions are discussed in relation to the composition. Their structures LiTi2 – xGex(PO4)3 (0 ≤ x < 2) were determined from X-ray powder diffraction method (XRD) using Rietveld analysis. A sharp change in the lattice parameter a is observed between the compositions with x = 1. The lattice parameter c increases as the Ge content increases in the whole range of composition. The space group R3c becomes R3 for the composition with x > 1. The SEM micrographs of the samples show relative porous microstructures due to the effect of the substitution.

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  1. LIME Laboratory, University of Jijel, Jijel, Algeria

    Nedjemeddine Bounar

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Nedjemeddine Bounar The Origin of Phase Transition and the Usual Evolutions of the Unit-Cell Constants of the NASICON Structures of the Solid Solution LiTi2 – xGex(PO4)3. Phys. Solid State 61, 2446–2450 (2019). https://doi.org/10.1134/S1063783419120072

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