Fig. 1: Crystal structure and ion transport properties of NaTaCl6 and NaNbCl6.
From: A sodium superionic chloride electrolyte driven by paddle wheel mechanism for solid state batteries
a Powder X-ray diffraction patterns of NaTaCl6 and NaNbCl6. b The enlarged XRD patterns with the 2θ range from 15.5° to 19.5° (top) and 30.4° to 33.1° (bottom). c The crystal structure of Na(Ta,Nb)Cl6 shown along the [001] direction. The [TaCl6]/[NbCl6] octahedra are shown in blue, and [NaCl6] prisms are shown in pink. d, e The Nyquist plots of impedance spectroscopy measurements at 27 °C for (d) NaTaCl6 and (e) NaNbCl6, along with the equivalent circuit models used for data fitting. The circuit for NaTaCl6 consists of a resistor (R) in series with a constant phase element (CPE), while that for NaNbCl6 includes a CPE in parallel with a resistor, in series with another CPE. f The Na+-ion conductivities of NaTaCl6 and NaNbCl6 at different temperatures (253−333 K). The dotted lines are the linear fit to the data, giving rise to activation energies of 0.31 eV for NaTaCl6, and 0.38 eV for NaNbCl6, respectively. Source data for figure are provided as a Source Data file.
