Equiatomic Intermetallic Europium Compounds:  Syntheses, Crystal Chemistry, Chemical Bonding, and Physical Properties

Abstract

The crystal chemistry of ternary equiatomic europium compounds EuTX (T ) transition metal; X ) element of the III, IV, or V main group) is reviewed. Besides preparation techniques we have especially focused on the structure-property relationships and peculiarities in chemical bonding. A main interest in these compounds is the valence state of the europium atoms. The magnetic susceptibility and electrical conductivity data, 151 Eu Mössbauer spectroscopic results and L III X-ray absorption experiments are discussed in detail.

Evidence of a Mixed Magnetic Phase in EuMgGe: A Semi­metallic Zintl Compound with TiNiSi Structure Type

“…[10] Several ternary intermetallic europium compounds EuMX (M = metal; X = III/IV/V main group element), adopting this structure type, have been found to display ferro-and antiferromagnetic ordering. [11] Although many members of this family have been structurally characterized, much can still be explored in terms of their magnetism. [12] The composition of EuMgGe is also interesting with respect to its electronic structure and transport properties.…”

Dimorphic EuCu5Cd

“…4 (top). HT-EuCu 5 Cd shows Curie-Weiss behavior in the temperature regime 100 -300 K and the experimental magnetic moment was determined showed a Weiss constant of 10.7(5) K. Below 100 K we observe a small bump in the susceptibility plot which is associated with a trace amount of a ferromagnetic (T C = 70 K) EuO impurity, frequently observed in europium intermetallics [29], most recently also for Eu 5 Au 2 Cd [26]. The europium magnetic moments in HT-EuCu 5 Cd order antiferromagnetically at T N = 17.7(5) K.…”

Synthesis, Crystal Structure, Polymorphism, and Magnetism of Eu(CN3H4)2 and First Evidence of EuC(NH)3

“…In addition, we detected a minor side phase of EuO, likely formed during handling of Eu metal under argon. Such an impurity can often be seen in the literature [38]. The Rietveld refinement estimates the amount of EuO as 1.3(2) wt %.…”