Mg_0.5Zr₂(PO₄)₃ is a promising electrolyte for Mg solid-state batteries. But it is difficult to achieve high-density thin films with phase purity. Here, we synthesized Mg_0.5(1+x)Fe_xZr_2−x(PO₄)₃ nanopowders using liquid-feed flame spray pyrolysis and used the product to form transparent thin films via simple pressureless sintering at 1100 °C. The influence of Fe on the phase and microstructure were discussed and the bottlenecks during Mg²⁺ conduction pathway were calculated. The dense and high-purity Mg_0.6Fe_0.2Zr_1.8(PO₄)₃ exhibited an extremely low ionic area specific resistance of 1.6 kΩ cm² at 200 °C. This paper presents a method for preparing dense, high-purity solid electrolytes at modest sintering temperatures.

Mg _0.5 Zr ₂（PO ₄）₃是用于Mg固态电池的有希望的电解质。但是，难以获得具有相纯度的高密度薄膜。在这里，我们使用液体进料火焰喷涂热解法合成了Mg _{0.5（1+ x）} Fe _x Zr _{2− x}（PO ₄）₃纳米粉，并使用该产品通过在1100°C的简单无压烧结来形成透明薄膜。讨论了Fe对相和微观结构的影响，并计算了Mg ²⁺传导途径中的瓶颈。致密高纯Mg _0.6 Fe_0.2 Zr _1.8（PO ₄）₃在200°C时具有1.6kΩcm ^2的极低离子面积比电阻。本文提出了一种在适度的烧结温度下制备致密，高纯度固体电解质的方法。