Polycrystalline ErFeCuGe₄O₁₂ has been prepared in a solid-state reaction. It adopts a tetragonal crystal structure; space group P4/nbm with a = 9.6416(1), c = 4.7532(1) at room temperature. The Er³⁺ cations are in square-antiprismatic coordination and the Fe³⁺ and Cu²⁺ cations are disordered over one six-coordinate site. The magnetic moments of the three cations adopt an antiferromagnetic arrangement on cooling below 20 K in H = 0 kOe. The magnetic structure consists of ferromagnetic (001) sheets with the spin direction in neighbouring sheets alternating between [001] and [00 $\bar{1}]$At 5 K the ordered moment of Er³⁺ was determined by neutron diffraction to be 7.90(3) µ_B and the mean moment of Fe³⁺ and Cu²⁺ was 2.43(2) µ_B. The magnetic structure is unchanged in an applied field of 10 kOe but in fields ≥20 kOe the compound begins a metamagnetic transition to a ferromagnetic structure with all atomic moments aligned along [001].

已经通过固态反应制备了多晶ErFeCuGe ₄ O ₁₂。它采用四方晶体结构；在室温下，空间群P 4 / nbm的a = 9.6416（1），c = 4.7532（1）。Er ³⁺阳离子呈方形反棱角配位，Fe ³⁺和Cu ²⁺阳离子在一个六坐标位点上无序排列。 在H = 0时冷却至20 K以下时，三个阳离子的磁矩采用反铁磁排列 O 磁性结构由铁磁（001）片组成，相邻片中的自旋方向在[001]和[00]之间交替$\overline{\mathrm{1个}}]$在5  ķEr构成的一阶矩³⁺通过中子衍射测定为7.90（3）μ_乙和Fe的平均时刻³⁺和Cu ²⁺为2.43（2）μ_乙。在10  kOe的外加磁场中，磁性结构未发生变化，但在≥20  kOe的场中，化合物开始向亚铁磁结构的亚磁跃迁，所有原子矩均沿[001]排列。