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Metal Flux Growth of Praseodymium Iron Carbides Featuring FeC3 Units

机译:金属助熔剂碳化碳化碳化碳化碳化物的生长为FEC3单位

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摘要

Reactions of iron and carbon in a Pr/Ni eutectic flux have yielded three new Pr/Fe/C carbometalate compounds. Pr_(14)Fe_(6)C_(13) forms in tetragonal space group P 4_(2)/mnm ; Pr_(26)Fe_(19)C_(29) forms in orthorhombic space group Pmmn . Both structures feature trigonal planar FeC_(3) groups, which corner- and edge-share to weave complex networks that encapsulate the praseodymium cations. A possible carbide hydride, Pr_(15)(FeC_(6))_(4)H (P 6? space group), was also observed to form from the same reaction that yielded Pr_(26)Fe_(19)C_(29). Magnetic susceptibility data were collected on these materials, all of which show complex magnetic behavior. Antiferromagnetic coupling forces are indicated in the high temperature paramagnetic state. However, at low temperature, ferromagnetic interactions dominate for Pr_(14)Fe_(6)C_(13) and Pr_(26)Fe_(19)C_(29), which have Curie temperatures of ~33 and 14 K, respectively. For Pr_(15)(FeC_(6))_(4)H at low temperatures, ferrimagnetic or canted antiferromagnetic ordering occurs below 20 K.
机译:铁和碳在Pr/Ni共晶熔剂中的反应产生了三种新的Pr/Fe/C碳金属化合物。Pr_14)Fe_6)C_13在四方空间群p4_2)/mnm;Pr_26)Fe_19)C_29在正交晶系空间群Pmmn中形成。这两种结构都以三角平面FeC_3(3)群为特征,它们的角和边共享,以编织封装镨阳离子的复杂网络。在生成Pr_26)Fe_19)C_29的同一反应中,还观察到可能的碳化物氢化物Pr_15(FeC_6))4)H(P6?空间群)。收集了这些材料的磁化率数据,所有这些材料都显示出复杂的磁行为。反铁磁耦合力在高温顺磁状态下表示。然而,在低温下,居里温度分别为~33和14K的Pr_14)Fe_6)C_13和Pr_26)Fe_19)C_29的铁磁相互作用占主导地位。对于低温下的Pr_15(FeC_6))4)H,在20K以下发生铁磁或倾斜反铁磁有序。

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