Ternary orthorhombic Laves phases Sr2Pd3Sn, Eu2Pd3Sn and Eu2Pd3In

IF 0.9 4区材料科学 Q3 CRYSTALLOGRAPHY

Zeitschrift Fur Kristallographie-Crystalline Materials Pub Date : 2023-04-17 DOI:10.1515/zkri-2023-0014

Joshua Wiethölter, Aylin Koldemir, T. Block, M. Reimann, Steffen Klenner, Rainer Pöttgen

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Abstract

Abstract The ternary Laves phases Sr2Pd3Sn, Eu2Pd3Sn and Eu2Pd3In were synthesized by induction melting of the elements in sealed tantalum ampoules. The polycrystalline products were characterized through their powder X-ray diffraction patterns. The structure of Eu2Pd3Sn was refined from single crystal X-ray diffractometer data: Mg2MnGa3 type, Cmcm, a = 583.36(5), b = 908.31(7), c = 958.06(8) pm, wR2 = 0.0366, 557 F2 values, 23 variables. The palladium and tin atoms show the inverse coloring on the network of condensed tetrahedra of Mg2MnGa3, i.e., MnGa3 versus Pd3Sn. Refinement of the occupancy parameters revealed small defects for the europium site, leading to composition Eu1.962(6)Pd3Sn for the studied crystal. Sr2Pd3Sn is a Pauli paramagnet and Eu2Pd3Sn shows Curie-Weiss paramagnetism (7.86(1) µB Eu atom−1 and ΘP = 48.1(1) K). Ferromagnetic ordering is observed below TC = 46.1(1) K. The 119Sn and 151Eu Mössbauer spectra of Sr2Pd3Sn and Eu2Pd3Sn are discussed with respect to electron density changes as a function of the tin content and the ionicity in the sequence of the stannides Sr2Pd3Sn/Eu2Pd3Sn → Sr2Pd2Sn/Eu2Pd2Sn → EuPdSn → EuPdSn2.

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三元正交laaves相Sr2Pd3Sn, Eu2Pd3Sn和Eu2Pd3In

摘要:在密封钽安瓿中，通过感应熔融法制备了Sr2Pd3Sn、Eu2Pd3Sn和Eu2Pd3In三元Laves相。通过粉末x射线衍射图对产物进行了表征。利用x射线衍射单晶数据对Eu2Pd3Sn的结构进行了精化:Mg2MnGa3型，Cmcm, a = 583.36(5)， b = 908.31(7)， c = 958.06(8) pm, wR2 = 0.0366, 557 F2值，23个变量。钯和锡原子在Mg2MnGa3的缩合四面体网络上呈现相反的着色，即MnGa3与Pd3Sn。通过对占位参数的改进，发现铕位点存在较小的缺陷，从而得到了Eu1.962(6)Pd3Sn。Sr2Pd3Sn为泡利顺磁体，Eu2Pd3Sn为居里-魏斯顺磁体(7.86(1) µB Eu 原子−1和ΘP = 48.1(1) K)。在TC = 46.1(1) K以下观察到铁磁有序。本文从Sr2Pd3Sn/Eu2Pd3Sn→Sr2Pd2Sn/Eu2Pd2Sn→EuPdSn→EuPdSn2的顺序，讨论了Sr2Pd3Sn和Eu2Pd3Sn的119Sn和151Eu Mössbauer光谱中电子密度随锡含量和离子性的变化规律。

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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.