Ionic conductivity of the NaZr2(PO4)3 single crystals

A Single‐Phase, All‐Solid‐State Sodium Battery Using Na3−xV2−xZrx(PO4)3 as the Cathode, Anode, and Electrolyte

“…Figure b presents the electrical conductivity of the Na 3− x V 2− x Zr x (PO 4 ) 3 ( x = 0–1.0) series at 298 K. The Na 2.4 V 1.4 Zr 0.6 (PO 4 ) 3 ( x = 0.6) is seen to have the highest conductivity, with a value of 1.2 × 10 −5 S cm −1 . This value is two orders of magnitude higher than that of undoped Na 3 V 2 (PO 4 ) 3 and also higher than the reported value for NaZr 2 (PO 4 ) 3 , although it is still much lower than the conductivity of a typical NASICON, such as Na 3 Zr 2 Si 2 PO 12 (1.0 × 10 −4 S cm −1 ) . As one possible reason for the increased electrical conductivity of the doped material is its increased density as can be seen from scanning electron micropscopy (SEM) images in Figure S5 (Supporting Information).…”

Pressure induced phase transformations in NaZr2(PO4)3 studied by X-ray diffraction and Raman spectroscopy

“…It crystallizes in a rhombohedral structure with space group R-3c and exhibits anisotropic thermal expansion [1]. The compounds of this family with various ionic substitutions have interesting physical properties such as anisotropic low thermal expansion [2][3][4], ionic conductivity [5][6][7], and host for nuclear waste immobilization [8]. On heating, the c-parameter of NZP increases due to large expansion of Na-O bond with simultaneous decrease in the aparameter due to coupled rotation of ZrO 6 and PO 4 polyhedra leading to an average low thermal expansion coefficient (α ¼4.5 Â 10 À 6 /K) [2].…”

Scaling Effects in Sodium Zirconium Silicate Phosphate (Na1+xZr2SixP3−xO12) Ion‐Conducting Thin Films

“…For the x = 0.25 composition film, it is possible that the increased crystallographic texture, in addition to larger crystallite size, could lead to a higher measured ionic conductivity . However, direction‐dependent ion conductivity measurements have been performed on x = 0 single crystals, which has the same symmetry as the x = 0.25 composition, and no conduction anisotropy was observed, which suggests that crystallographic texture does not contribute to the higher ion conductivity observed in samples of this composition. More likely, the crystallographic texture results in a columnar grain morphology that has decreased numbers of grain boundaries through the film thickness.…”