Imaging the diffusion pathway of Al3+ ion in NASICON-type (Al0.2Zr0.8)20/19Nb(PO4)3 as electrolyte for rechargeable solid-state Al batteries<xref rid="cpb_27_12_128201fn1" ref-type="fn">*</xref><fn id="cpb_27_12_128201fn1"><label>*</label>Project supported by the National Natural Science Foundation of China (Grant Nos. 51672029, 51372271, and 51172275) and the National Key Research and Development Project from the Ministry of Science and Technology, China (Grant No. 2016YFA0202702).</fn>

Imaging the diffusion pathway of Al³⁺ ion in NASICON-type (Al_0.2Zr_0.8)_20/19Nb(PO₄)₃ as electrolyte for rechargeable solid-state Al batteries**

Project supported by the National Natural Science Foundation of China (Grant Nos. 51672029, 51372271, and 51172275) and the National Key Research and Development Project from the Ministry of Science and Technology, China (Grant No. 2016YFA0202702).

Wang Jie¹, Sun Chun-Wen^{1, 6, 9, †}, Gong Yu-Dong¹, Zhang Huai-Ruo^{2, 3, ‡}, Alonso Jose Antonio^{4, §}, Fernández-Díaz María Teresa⁵, Wang Zhong-Lin^{1, 6, 7, 9}, Goodenough John B⁸

(color online) (a) and (b) Crystal structure of (Al_0.2Zr_0.8)_20/19Nb(PO₄)₃ consisting of a framework of (Nb,Zr)O₆ octahedra sharing corners with PO₄ tetrahedra. The strongly anisotropic thermal displacements of the Al³⁺ ions with the ellipsoids directed along the [001] directions are enhanced at (a) 200 °C, and (b) 800 °C. Thermal variation of [panels (c) and (d)] unit-cell parameters and (e) volume, and (f) thermal displacement (B_eq) of Al.