Magnesium and barium in two substructures: BaTMg2 (T = Pd, Ag, Pt, Au) and the isotypic cadmium compound BaAuCd2 with MgCuAl2 type structure

IF 0.9 4区材料科学 Q3 CRYSTALLOGRAPHY

Zeitschrift Fur Kristallographie-Crystalline Materials Pub Date : 2022-11-23 DOI:10.1515/zkri-2022-0059

M. Reimann, R. Pöttgen

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引用次数: 1

Abstract

Abstract The intermetallic barium compounds BaTMg2 (T = Pd, Ag, Pt, Au) and BaAuCd2 were synthesized by reactions of the elements in sealed tantalum ampoules in muffle furnaces. The five compounds crystallize with the orthorhombic MgCuAl2 type structure, space group Cmcm, with small differences in chemical bonding between the magnesium and cadmium series. All samples were characterized through their Guinier powder diffraction patterns. The structures of BaPdMg2 (a = 444.57(4), b = 1174.67(10), c = 827.58(7) pm, wR2 = 0.0460, 475 F2 values, 16 variables), BaAuMg2 (a = 450.27(6), b = 1183.94(16), c = 838.76(11) pm, wR2 = 0.0355, 473 F2 values, 16 variables) and BaAuCd2 (a = 463.31(5), b = 1112.79(12), c = 826.63(8) pm, wR2 = 0.0453, 469 F2 values, 16 variables) were refined from single crystal X-ray diffraction data. The large barium atoms push the [TMg2] respectively [AuCd2] substructures apart. This allows fast moisture attack and leads to fast hydrolyzes of the samples when they get in contact with water. The influence of the difference in electronegativity between magnesium and cadmium is reflected for the pair of compounds BaAuMg2 and BaAuCd2. The magnesium compound shows the higher auridic character, while the cadmium compound shows a tendency towards a three-dimensional cadmium substructure.

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两种亚结构中的镁和钡：BaTMg2（T=Pd，Ag，Pt，Au）和具有MgCuAl2型结构的同型镉化合物BaAuCd2

摘要在马弗炉中，通过密封钽安瓿中的元素反应，合成了金属间钡化合物BaTMg2（T=Pd，Ag，Pt，Au）和BaAuCd2。这五种化合物结晶为正交MgCuAl2型结构，空间群为Cmcm，镁和镉系列之间的化学键差异较小。所有样品都通过其Guinier粉末衍射图进行了表征。BaPdMg2（a=444.57（4），b=1174.67（10），c=827.58（7）pm，wR2=0.0460475 F2值，16个变量），BaAuMg2（a=450.27（6），b=1183.94（16），c=838.76（11）pm，w R2=0.0355473 F2值，6个变量）和BaAuCd2晶体X射线衍射数据。大的钡原子分别将[TMg2]和[AuCd2]亚结构推开。这允许快速的湿气侵蚀，并导致样品在与水接触时快速水解。对于一对化合物BaAuMg2和BaAuCd2，反映了镁和镉之间电负性差异的影响。镁化合物表现出较高的金性，而镉化合物则表现出三维镉亚结构的趋势。

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来源期刊

Zeitschrift Fur Kristallographie-Crystalline Materials CRYSTALLOGRAPHY-

CiteScore

2.00

自引率

16.70%

发文量

期刊介绍： Zeitschrift für Kristallographie – Crystalline Materials was founded in 1877 by Paul von Groth and is today one of the world’s oldest scientific journals. It offers a place for researchers to present results of their theoretical experimental crystallographic studies. The journal presents significant results on structures and on properties of organic/inorganic substances with crystalline character, periodically ordered, modulated or quasicrystalline on static and dynamic phenomena applying the various methods of diffraction, spectroscopy and microscopy.