Orthorhombic Er2Ge5, with a ZrSi2–DyGe3 intergrowth structure
摘要:
Investigations in the Er-Ge phase diagram enable the characterization of two new erbium germanides: Er2Ge5 and ErGe2+x (x = 0.16) Both compounds have been studied by single crystal X-ray diffraction. The Er,Ge, compound is of a new type characterized by a stacking of ZrSi2 and DyGe3 blocks (S.G.: Pmmn, a = 4.0081 Angstrom, b = 3.8855 Angstrom, c = 18.288 Angstrom). The ZrSi2-type ErGe2+x compound (S.G.: Cmcm, a = 4.019 Angstrom, b = 15.843 Angstrom, c = 3.881 Angstrom) displays a partial occupation of the pyramidal holes of the ZrSi2 structure. The structural features of the ErGe3, Er2Ge5 and ErGe2+x compounds are discussed. (C) 1999 Elsevier Science S.A. All rights reserved.
Structure and magnetic ordering in the defect compound ErGe1.83
作者:O Oleksyn、P Schobinger-Papamantellos、C Ritter、C.H de Groot、K.H.J Buschow
DOI:10.1016/s0925-8388(96)02714-4
日期:1997.5
Abstract The crystal structure and the magneticordering of the novel orthorhombic compound ErGe 2− x has been studied by neutron powder diffraction and magneticmeasurements. The crystal structure belongs to the DyGe 1.85 -type (space group Cmc2 1 ). ErGe 2− x ( x =0.17(2)) orders antiferromagnetically below T N =6 K with a uniaxial magnetic moment arrangement. The magnetic cell has the same size as the chemical
摘要 通过中子粉末衍射和磁测量研究了新型正交晶系化合物 ErGe 2- x 的晶体结构和磁序。晶体结构属于 DyGe 1.85 型(空间群 Cmc2 1 )。ErGe 2− x ( x =0.17(2)) 以单轴磁矩排列在TN = 6 K以下反铁磁性排序。磁性单元具有与化学晶胞相同的尺寸(q = 0)。磁空间群是 Cmc2 1 ( Sh 36 173 )。在 T = 1.5 K 时,两个铒位点的磁矩具有相同的有序磁矩值 7.63(6) μ B /Er 并且沿 a 方向反铁磁耦合。