Platinum Triangles in the Pt/Al Framework of the Intermetallic REPt6Al3 (RE = Ce–Nd, Sm, Gd, Tb) Series
Platinum Triangles in the Pt/Al Framework of the Intermetallic REPt6Al3 (RE = Ce–Nd, Sm, Gd, Tb) Series
复制标题
金属间化合物 REPt6Al3 (RE = Ce-Nd, Sm, Gd, Tb) 系列 Pt/Al 骨架中的铂三角形
DOI：
10.1002/zaac.201700090
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
O. Janka
中科院分区：
文献类型：
--
作者：
Fabian Eustermann;F. Stegemann;Konstantin Renner;O. Janka
REPt6Al3系列化合物(RE=Ce-Nd，Sm，Gd，Tb)是由这些元素通过电弧炉熔炼得到的。通过粉末和单晶X射线衍射(NdPt6Al3：WR=0.0432,759F2值，33个变量)以及磁化率测量对它们进行了表征。等结构化合物在三方晶系中具有新的结构类型，空间群为R3c，晶胞中有12个公式单元，晶胞参数为a=752-755和c=3882-3945 pm晶体结构可以用沿[001]方向堆积的不同板条来描述。一层以PT3三角形为特征，以以···ABCA‘B’C‘···序列排列的扁平蜂窝RE层的空腔为中心。另一层由浓缩的六方[Pt6Al6]棱柱组成，以铂原子为中心，分隔上述板条。磁性测量表明，所有稀土原子都处于三价氧化态，但由于稀土元素含量较低，只有在低温下才能观察到磁有序现象[SmPt6Al3：Tc=5.0(1)K；GdPt6Al3：Tc=7.3(1)K；TbPt6Al3：Tn=3.6(1)K]。
The compounds of the REPt6Al3 series (RE = Ce–Nd, Sm, Gd, Tb) were obtained by reaction of the elements via arc-melting. They were characterized by powder and single-crystal X-ray diffraction (NdPt6Al3: wR = 0.0432, 759 F2 values, 33 variables) as well as by magnetic susceptibility measurements. The isostructural compounds crystallize with a new structure type in the trigonal crystal system with space group R3c, twelve formula units in the unit cell, and lattice parameters of a = 752–755 and c = 3882–3945 pm. The crystal structure can be described by different slabs stacked along [001]. One layer features Pt3 triangles, centering the cavities of a flat honeycomb RE layer that are arranged in a ···ABCA′B′C′··· sequence. The other layer consists of condensed hexagonal [Pt6Al6] prisms, centered by Pt atoms, separating the before mentioned slabs. Magnetic measurements revealed that all rare-earth atoms are in the trivalent oxidation state, however, due to the low lanthanoide content magnetic ordering phenomena were observed only at low temperatures [SmPt6Al3: TC = 5.0(1) K; GdPt6Al3: TC = 7.3(1) K; TbPt6Al3: TN = 3.6(1) K].
影响因子：
4.6
作者：
J. Nickolaus;Dominik A. Imbrich;S. H. Schlindwein;Adrian H. Geyer;M. Nieger;D. Gudat
通讯作者：
J. Nickolaus;Dominik A. Imbrich;S. H. Schlindwein;Adrian H. Geyer;M. Nieger;D. Gudat