The samples LiMn2−x(Ni0.33Co0.33Fe0.33)xO4 (0 ≤ x ≤ 2) were synthesized by starch-based gel combustion method. The x-ray phase analysis of the obtained samples revealed the polymorphic transformations of the solid solution LiMn2−x(Ni0.33Co0.33Fe0.33)xO4 (0 ≤ x ≤ 2.0) under isobaric-isothermal conditions when changing the composition: from the disordered spinel (0 ≤ x < 1.0) to the ordered spinel (1.0 < x ≤ 1.8) up to halite (x = 2). The electrochemical testing of the solid solution’s LiMn2−x(Ni0.33Co0.33Fe0.33)xO4 samples was conducted.

中文翻译：

---

在 LiMn2−x(Ni0.33Co0.33Fe0.33)xO4 (0 ≤ x ≤ 2) 范围内具有尖晶石型结构的固溶体转变

样品 LiMn2-x(Ni0.33Co0.33Fe0.33)xO4 (0 ≤ x ≤ 2) 是通过淀粉基凝胶燃烧法合成的。所得样品的 X 射线相分析揭示了在等压-等温条件下，当改变成分时，固溶体 LiMn2-x(Ni0.33Co0.33Fe0.33)xO4 (0 ≤ x ≤ 2.0) 的多晶型转变：从无序尖晶石 (0 ≤ x < 1.0) 到有序尖晶石 (1.0 < x ≤ 1.8) 直至岩盐 (x = 2)。对固溶体的 LiMn2-x(Ni0.33Co0.33Fe0.33)xO4 样品进行电化学测试。