Materials Data on Eu2O3 by Materials Project

Eu2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. The structure is three-dimensional. there are two inequivalent Eu3+ sites. In the first Eu3+ site, Eu3+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Eu–O bond lengths are 2.36 Å. In the second Eu3+ site, Eu3+ is bonded to six equivalent O2- atoms to form a mixture of distorted edge and corner-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. There are a spread of Eu–O bond distances ranging from 2.32–2.39 Å. O2- is bonded to four Eu3+ atoms to form a mixture of distorted edge and corner-sharing OEu4 tetrahedra.

三氧化二铕（Eu₂O₃）具有刚玉型结构，结晶于立方晶系Ia-3空间群，其晶体结构为三维骨架结构。体系中存在两个不等价的三价铕（Eu³+）配位位点。在第一个Eu³+位点中，Eu³+与六个等价的二价氧（O²-）原子成键，形成兼具共边与共角连接方式的EuO₆八面体。该共角八面体的倾斜角为56°，所有Eu-O键长均为2.36 Å。在第二个Eu³+位点中，Eu³+同样与六个等价的O²-原子成键，形成畸变的共边与共角连接模式的EuO₆八面体，其共角八面体倾斜角同样为56°，Eu-O键长分布范围为2.32~2.39 Å。O²-则与四个Eu³+原子成键，形成畸变的共边与共角连接模式的OEu₄四面体。