Limitation in the synthesis of single-crystal has restricted the complete understanding of the magnetoelectric properties of bulk ε-Fe₂O₃. In order to understand the electric polarization of bulk ε-Fe₂O₃, we have employed a first-principles Berry-phase method and the density functional perturbation theory to calculate the spontaneous electric polarization and Born effective charges (BECs) of ε-Fe₂O₃. The polarization quanta of the ferroelectric bulk ε-Fe₂O₃ and its polarization lattice are also reported. The polarization switching through a paraelectric transition phase of a low barrier is found to be favorable. The polarization and BECs calculated by both methods are in good agreement.

限制在单晶的合成已经限制的散装ε -铁磁电属性的完整的理解₂ ö ₃。为了理解散装的电偏振ε -铁₂ ö ₃ ε-的Fe，我们已经采用第一原理浆果相法和密度泛函微扰理论计算自发电极化和出生有效电荷（的BEC）₂ O ₃。铁电体块体的极化量子ε -铁₂ ö ₃还报道了其极化晶格。发现通过低势垒的顺电转变相的偏振切换是有利的。两种方法计算的极化和BEC吻合良好。