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Cd2 and Co2 dumbbell formation in the yttrium-rich intermetallic compounds Y14Ni3Cd3 and Y6Co2Zn
Zeitschrift für Kristallographie - Crystalline Materials ( IF 0.9 ) Pub Date : 2020-10-25 , DOI: 10.1515/zkri-2020-0060
Theresa Block 1 , Rainer Pöttgen 1
Affiliation  

Abstract The yttrium-rich intermetallic compounds Y14Ni3Cd3 and Y6Co2Zn were obtained by direct reactions of the elements in sealed tantalum tubes in an induction furnace. Both samples were characterized by X-ray powder diffraction and the structures were refined from single-crystal X-ray diffraction data: Lu14Co3In3 type, P42/nmc, a = 960.06(5), c = 2314.9(1) pm, wR2 = 0.0669, 2034 F 2 values, 63 parameters for Y14Ni3.16(2)Cd2.84(2) and Ho6Co2Ga type, Immm, a = 943.08(7), b = 950.08(7), c = 997.64(7) pm, wR2 = 0.0476, 981 F 2 values, 34 parameters for Y6Co2Zn. One cadmium site shows a small degree of Cd/Ni mixing, leading to the composition Y14Ni3.16(2)Cd2.84(2). Although both compounds crystallize with significantly different structure types, they show very similar monomeric building units: (i) transition metal centered trigonal prisms of yttrium, (ii) empty Y6 octahedra and (iii) icosahedral coordination of the cadmium respectively zinc atoms. The condensation patterns of these building units are discussed and for Y14Ni3.16(2)Cd2.84(2), we elaborate a crystal chemical building principle along with the rare earth metal-rich phases RE 15Rh5Cd2 (La15Rh5Cd2 type), RE 23 T 7 X 4 (Pr23Ir7Mg4 type), RE 4 TX (Gd4RhMg type) and RE 10 TX 3/RE 9 TX 4 (ordered Co2Al5 versions). The structures of Y14Ni3Cd3 and Y6Co2Zn show dumbbell formation: 306 pm Cd–Cd in Y14Ni3Cd3 and 224 pm Co1–Co1 and 246 pm Co2–Co2 in Y6Co2Zn.

中文翻译:

富钇金属间化合物 Y14Ni3Cd3 和 Y6Co2Zn 中 Cd2 和 Co2 哑铃的形成

摘要 富钇金属间化合物Y14Ni3Cd3和Y6Co2Zn是在感应炉中通过密封钽管中的元素直接反应获得的。两个样品均通过 X 射线粉末衍射表征,并根据单晶 X 射线衍射数据对结构进行了细化:Lu14Co3In3 型,P42/nmc,a = 960.06(5),c = 2314.9(1) pm,wR2 = 0.0669 , 2034 F 2 值,Y14Ni3.16(2)Cd2.84(2) 和 Ho6Co2Ga 型的 63 个参数,Immm,a = 943.08(7),b = 950.08(7),c = 997.64(7) pm,wR2 = 0.0476, 981 F 2 值,Y6Co2Zn 的 34 个参数。一个镉位点显示出小程度的 Cd/Ni 混合,导致组成 Y14Ni3.16(2)Cd2.84(2)。尽管这两种化合物的结晶结构类型明显不同,但它们显示出非常相似的单体构建单元:(i) 钇的过渡金属中心三角棱镜,(ii) 空 Y6 八面体和 (iii) 镉和锌原子的二十面体配位。讨论了这些构建单元的冷凝模式,对于 Y14Ni3.16(2)Cd2.84(2),我们详细阐述了晶体化学构建原理以及富含稀土金属的相 RE 15Rh5Cd2(La15Rh5Cd2 型)、RE 23 T 7 X 4(Pr23Ir7Mg4 型)、RE 4 TX(Gd4RhMg 型)和 RE 10 TX 3/RE 9 TX 4(订购的 Co2Al5 版本)。Y14Ni3Cd3 和 Y6Co2Zn 的结构显示出哑铃形:Y14Ni3Cd3 中 Cd-Cd 为 306 pm,Y6Co2Zn 中为 224 pm Co1-Co1 和 246 pm Co2-Co2。我们详细阐述了晶体化学构建原理以及稀土金属富相 RE 15Rh5Cd2(La15Rh5Cd2 型)、RE 23 T 7 X 4(Pr23Ir7Mg4 型)、RE 4 TX(Gd4RhMg 型)和 RE 10 TX 3/RE 9 TX 4(订购的 Co2Al5 版本)。Y14Ni3Cd3 和 Y6Co2Zn 的结构显示出哑铃形:Y14Ni3Cd3 中 Cd-Cd 为 306 pm,Y6Co2Zn 中为 224 pm Co1-Co1 和 246 pm Co2-Co2。我们详细阐述了晶体化学构建原理以及稀土金属富相 RE 15Rh5Cd2(La15Rh5Cd2 型)、RE 23 T 7 X 4(Pr23Ir7Mg4 型)、RE 4 TX(Gd4RhMg 型)和 RE 10 TX 3/RE 9 TX 4(订购的 Co2Al5 版本)。Y14Ni3Cd3 和 Y6Co2Zn 的结构显示出哑铃形:Y14Ni3Cd3 中 Cd-Cd 为 306 pm,Y6Co2Zn 中为 224 pm Co1-Co1 和 246 pm Co2-Co2。
更新日期:2020-10-25
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