A novel facile solvothermal fluorination method was developed for metastable oxyfluorides preparation by filling anion vacancies in parent structures. High solubility of XeF₂ in acetonitrile and polarity of the solvent allowed for lower reaction temperature. The validity of the method was demonstrated by the preparation of a known oxyfluoride, SrCoO_2.5F_0.5, at unprecedented low temperature (100 ​°C). Additionally, two new oxyfluorides with idealized stoichiometry of La₄Ni₃O₈F₁ and La₄Ni₃O₈F₂, were prepared by the solvothermal fluorination via the La₄Ni₃O₈ infinite-layer intermediate. The proposed method allows preparation of metastable oxyfluorides, utilizes only inexpensive commercial autoclaves and can potentially find widespread utilization in materials synthesis.

通过填充母体结构中的阴离子空位，开发了一种新颖的溶剂热氟化方法，用于制备亚稳态的氟氧化物。XeF ₂在乙腈中的高溶解度和溶剂的极性允许较低的反应温度。通过制备已知的氟氧化物SrCoO ₂证明了该方法的有效性_。5 F _0.5，在前所未有的低温（100°C）下。此外，还添加了两种化学计量理想的La ₄ Ni ₃ O ₈ F ₁和La ₄ Ni ₃ O ₈ F ₂化学氟化物。通过经由La ₄ Ni ₃ O ₈无限层中间体的溶剂热氟化来制备α，β 。所提出的方法允许制备亚稳态的氟氧化物，仅利用廉价的商业高压釜，并有可能在材料合成中发现广泛的用途。