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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Preparation, crystal structure, and magnetic properties of rare earth ruthenium and osmium carbides with La3.67FeC6 type structure
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Preparation, crystal structure, and magnetic properties of rare earth ruthenium and osmium carbides with La3.67FeC6 type structure

机译：具有La3.67FeC6型结构的稀土钌和碳化s的制备，晶体结构和磁性

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摘要

The new carbides Gd3.67RuC6 and Ln(3.67)OsC(6) (Ln = La-Nd, Sm) were prepared by are-melting of cold-pressed pellets of the elemental components. Their hexagonal (P6(3)/m) La3.67FeC6 type crystal structure was refined from X-ray powder diffraction data of La3.67OsC6 (a = 889.1(1) pm, c = 535.1(1) pm) and Pr3.67OsC6 (n = 874.9(2) pm, c = 523.7(1) pm). The occupancy parameters of one La and one Pr site were refined to 0.35(5) and 0.34(5), respectively, in agreement. with the highest possible occupancy for steric reasons of 1/3. The C-C distances in the C-2 pairs are 139(6) pm and 137(3) pm, respectively, indicating double bonds. The environment of the osmium atoms is compatible with the 18-electron rule. The magnetic properties of several carbides were determined with a SQUID magnetometer. The lanthanum compounds La3.67RuC6 and La3.67OsC6 are Pauli paramagnetic. The magnetic properties of the other compounds are dominated by the magnetic moments of the rare earth atoms. Most order ferrimagnetically with Curie temperatures varying between 5(+/-3) and 32(+/-6) K for Ce3.67OsC6 and Pr3.67RuC6, respectively. The cerium atoms in Ce3.67RuC6 and Ce3.67OsC6 are essentially trivalent, and the samarium compounds show Van Vleck behavior. [References: 17]
机译：新的碳化物Gd3.67RuC6和Ln（3.67）OsC（6）（Ln = La-Nd，Sm）是通过将元素成分的冷压丸熔化而制备的。根据La3.67OsC6（a = 889.1（1）pm，c = 535.1（1）pm）和Pr3.67OsC6的X射线粉末衍射数据精炼了它们的六方（P6（3）/ m）La3.67FeC6型晶体结构（n = 874.9（2）pm，c = 523.7（1）pm）。根据协议，将一个La和一个Pr位点的占用参数分别优化为0.35（5）和0.34（5）。由于空间原因，最多可能占用1/3。 C-2对中的C-C距离分别为139（6）pm和137（3）pm，表示双键。 atoms原子的环境符合18电子规则。用SQUID磁力计测定了几种碳化物的磁性能。镧化合物La3.67RuC6和La3.67OsC6是顺磁性的Pauli。其他化合物的磁性由稀土原子的磁矩决定。对于Ce3.67OsC6和Pr3.67RuC6，居里铁磁性的居里温度分别在5（+/- 3）和32（+/- 6）K之间变化。 Ce3.67RuC6和Ce3.67OsC6中的铈原子基本上是三价的，the化合物具有Van Vleck行为。 [参考：17]

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