...
【24h】

Rare earth-ruthenium-magnesium intermetallics

机译:稀土 - 钌 - 镁金属间金属间

获取原文
获取原文并翻译 | 示例
           

摘要

Eight new intermetallic rare earth-ruthenium-magnesium compounds have been synthesized from the elements in sealed niobium ampoules using different annealing sequences in muffle furnaces. The compounds have been characterized by powder and single crystal X-ray diffraction. Sm9.2Ru6Mg17.8 (a = 939.6(2), c = 1779(1) pm), Gd11Ru6Mg16 (a = 951.9(2), c = 1756.8(8) pm), and Tb10.5Ru6Mg16.5 (a = 942.5(1), c = 1758.3(4) pm) crystallize with the tetragonal Nd9.34Ru6Mg17.66 type structure, space group I4/mmm. This structure exhibits a complex condensation pattern of square-prisms and square-antiprisms around the magnesium and ruthenium atoms, respectively. Y2RuMg2 (a = 344.0(1), c = 2019(1) pm) and Tb2RuMg2 (a = 341.43(6), c = 2054.2(7) pm) adopt the Er2RuMg2 structure and Tm3Ru2Mg (a = 337.72(9), c = 1129.8(4) pm) is isotypic with Sc3Ru2Mg. Tm3Ru2Mg2 (a = 337.35(9), c = 2671(1) pm) and Lu3Ru2Mg2 (a = 335.83(5), c = 2652.2(5) pm) are the first ternary ordered variants of the Ti3Cu4 type, space group I4/mmm. These five compounds belong to a large family of intermetallics which are completely ordered superstructures of the bcc subcell. The group-subgroup scheme for Lu3Ru2Mg2 is presented. The common structural motif of all three structure types are rutheniumcentered rare earth cubes reminicent of the CsCl type. Magnetic susceptibility measurements of Y2RuMg2 and Lu3Ru2Mg2 samples revealed Pauli paramagnetism of the conduction electrons.
机译:以密封铌安瓿中的元素为原料,在马弗炉中采用不同的退火顺序,合成了八种新的金属间化合物稀土钌镁化合物。通过粉末和单晶X射线衍射对化合物进行了表征。Sm9。2Ru6Mg17。8(a=939.6(2),c=1779(1)pm),Gd11Ru6Mg16(a=951.9(2),c=1756.8(8)pm)和Tb10。5Ru6Mg16。5(a=942.5(1),c=1758.3(4)pm)与四方Nd9结晶。34Ru6Mg17。66型结构,空间组I4/mmm。这种结构在镁原子和钌原子周围分别呈现出方形棱镜和方形反棱镜的复杂凝聚模式。Y2RuMg2(a=344.0(1),c=2019(1)pm)和Tb2RuMg2(a=341.43(6),c=2054.2(7)pm)采用Er2RuMg2结构,Tm3Ru2Mg(a=337.72(9),c=1129.8(4)pm)与Sc3Ru2Mg具有同型性。Tm3Ru2Mg2(a=337.35(9),c=2671(1)pm)和Lu3Ru2Mg2(a=335.83(5),c=2652.2(5)pm)是Ti3Cu4型空间群I4/mmm的第一个三元有序变体。这五种化合物属于一大类金属间化合物,它们是bcc亚细胞的完全有序的上层结构。给出了Lu3Ru2Mg2的群子群方案。这三种结构类型的共同结构主题都是以钌为中心的稀土立方体,而不是CsCl类型。Y2RuMg2和Lu3Ru2Mg2样品的磁化率测量揭示了传导电子的泡利顺磁性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号