Ioni conductivity in Nasicon-type phases Na1+xZr2−xLx(PO4)3 (L = Cr, In, Yb)

doi:10.1016/0167-2738(81)90084-9

Solid State Ionics

Volumes 3–4, August 1981, Pages 209-214

https://doi.org/10.1016/0167-2738(81)90084-9 Get rights and content

Abstract

The crystal chemistry of solid solutions of formula Na_1+xZr_2−xL_x(PO₄)₄ (L = Cr, In, Yb) (0⩽x⩽x_L^max) has been investigated. In each system a Nasicon-type phase is obtained, with x_Cr^max = 2.0, x_In^max = 1.85 and x_Yb^max = 1.90. All phases have rhombohedral symmetry (space group: R $3$ c) except for the composition Na₃Cr₂(PO₄)₃ where a small monoclinic distortion is detected at room temperature (space group: C2/c or Cc). The variation with x of the cell parameter is discussed. The ionic conductivity of all these materials increases strongly with sodium content up to a value of x(x_L^{σ max}) for which a maximum is observed. The conductivity versus reciprocal temperatures curves of Na₃Cr₂(PO₄)₃ show two slopes (ΔE = -0.42 and 1.1 eV) corresponding respectively to the rhombohedral and monoclinic forms. The behavior of the materials is discussed as a function of sodium content, sodium distribution in available sites, cation sizesand lattice covalency.

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^∗: Permanent address: Laboratoire de Physico-chimie Minérale I, Université Claude Bernard, 69621 Villeurbanne, France.

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Ioni conductivity in Nasicon-type phases Na1+xZr2−xLx(PO4)3 (L = Cr, In, Yb)

Abstract

Mat. Res. Bull.

Mat. Res. Bull.

Acta Chem. Scand.

Ioni conductivity in Nasicon-type phases Na_1+xZr_{2−_x}L_x(PO₄)₃ (L = Cr, In, Yb)