(Ca0.95Cd0.10)Pd2Cd3, SrPd2Cd3 and (Eu0.95Cd0.10)Pd2Cd3 with YNi2Al3 type structure – crystal chemistry and magnetic hyperfine interactions

IF 0.9 4区材料科学 Q3 CRYSTALLOGRAPHY Zeitschrift Fur Kristallographie-Crystalline Materials Pub Date : 2023-07-26 DOI:10.1515/zkri-2023-0025

Michael Johnscher, Birgit Gerke, Jutta Kösters, T. Block, O. Niehaus, M. Reimann, Rainer Pöttgen

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Abstract

Abstract The intermetallic compounds (Ca0.95Cd0.10)Pd2Cd3, SrPd2Cd3 and (Eu0.95Cd0.10)Pd2Cd3 were synthesized from the elements in sealed niobium ampoules in an induction furnace. The polycrystalline samples were characterized through their Guinier powder patterns. The structures were refined from single crystal X-ray diffractometer data: YNi2Al3 type, P6/mmm, a = 984.61(5), c = 455.33(3) pm, wR2 = 0.0216, 376 F2 values, 21 variables for (Ca0.95Cd0.10)Pd2Cd3, a = 998.55(8), c = 453.65(3) pm, wR2 = 0.0296, 341 F2 values, 17 variables for SrPd2Cd3 and a = 992.57(4), c = 457.34(2) pm, wR2 = 0.0300, 384 F2 values, 21 variables for (Eu0.95Cd0.10)Pd2Cd3. The striking crystal chemical motif in the three structures is a planar [PdCd2] Kagome-type layer. The two crystallographically independent Ca (Sr, Eu) atoms have a coordination number of 18 by 6 Pd and 12 Cd atoms. The calcium and europium compound show a small degree of Ca (Eu) substitution by Cd2 dumb-bells with 281 pm Cd–Cd in (Eu0.95Cd0.10)Pd2Cd3. Temperature dependent magnetic susceptibility measurements show Curie–Weiss behaviour (7.63(1) µB/Eu atom) for the europium compound and the onset of ferromagnetic ordering at TC = 14.9(2) K. The divalent character of europium is corroborated by 151Eu Mössbauer spectroscpy.

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(Ca0.95Cd0.10)Pd2Cd3, SrPd2Cd3和(Eu0.95Cd0.10)Pd2Cd3具有YNi2Al3型结构-晶体化学和磁超精细相互作用

摘要:以密闭铌安瓿为原料，在感应炉中合成了金属间化合物(Ca0.95Cd0.10)Pd2Cd3、SrPd2Cd3和(Eu0.95Cd0.10)Pd2Cd3。多晶样品通过吉尼尔粉末模式进行了表征。根据单晶x射线衍射仪数据对其结构进行了细化:YNi2Al3型，P6/mmm, a = 984.61(5)， c = 455.33(3) pm, wR2 = 0.0216, 376 F2值，(Ca0.95Cd0.10)Pd2Cd3的21个变量，a = 998.55(8)， c = 453.65(3) pm, wR2 = 0.0296, 341 F2值，SrPd2Cd3的17个变量和a = 992.57(4)， c = 457.34(2) pm, wR2 = 0.0300, 384 F2值，(Eu0.95Cd0.10)Pd2Cd3的21个变量。在这三个结构中引人注目的晶体化学基序是一个平面的[PdCd2] kagome型层。两个晶体独立的Ca (Sr, Eu)原子的配位数分别为18 × 6个Pd和12个Cd原子。在(Eu0.95Cd0.10)Pd2Cd3中，钙铕化合物被Cd2哑铃以281 pm Cd-Cd取代了少量的Ca (Eu)。温度相关磁化率测量表明，铕化合物具有居里-魏斯行为(7.63(1)µB/Eu原子)，并在TC = 14.9(2) k处开始铁磁有序。

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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.