Iron borate FeBO₃ crystals are annealed in neutral, oxidizing, and reducing gas media on a specially designed setup. The effect of the chemical medium and annealing modes on the surface morphology and phase composition of the samples is established. It is shown that annealing in a neutral or oxidizing medium leads to the recrystallization of FeBO₃ into the hematite α-Fe₂O₃ phase, whereas annealing in a reducing medium results in the formation of the pyroborate Fe₂B₂O₅ phase and the metal α-Fe iron phase. The difference in the nature of structural transformations is associated with the change in the valence state of iron ions upon annealing in the reducing atmosphere. This result is of interest as a method for the transformation of crystalline phases.

硼铁FeBO ₃晶体在专门设计的装置上在中性，氧化和还原性气体介质中退火。建立了化学介质和退火方式对样品表面形态和相组成的影响。结果表明，退火在中性或氧化性介质导致FEBO的再结晶₃到赤铁矿的α-Fe ₂ ö ₃相，而在焦硼酸的形成减少介质结果的Fe退火₂乙₂ ö ₅相和金属α-Fe铁相。结构转变性质的差异与还原气氛中退火时铁离子的价态变化有关。该结果作为转变晶相的方法是令人感兴趣的。