Enhancing 1D ionic conductivity in lithium manganese iron phosphate with low-energy optical phonons

Li_xMn_1−yFe_yPO₄ (0 < x ≤ 1, 0 ≤ y ≤ 1), which crystallizes in the Pnma space group^29,30, can exhibit three distinct Mn and Fe distributions within the unit cell when the Mn: Fe ratio is 1:1, as shown in Fig. 1. The first…