2023
DOI: 10.1515/revic-2023-0003
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Trivalent europium – a scarce case in intermetallics

Abstract: In most intermetallic europium compounds, the Eu atoms exhibit a divalent oxidation state with a high effective magnetic moment since Eu2+ is isoelectronic with Gd3+. Trivalent intermetallic Eu compounds, in contrast, are extremely scarce and under 20 examples are known to literature. This mini-review summarizes the known binary and ternary examples along with their crystal-chemical peculiarities as well as their magnetic and 151Eu Mössbauer spectroscopic behavior. Additionally, compounds that exhibit valence … Show more

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Cited by 10 publications
(4 citation statements)
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“…EuSi 2 Pd 2 , 25,26 EuSi 2 (Ir 1− x Pd x ) 2 , 27 EuSi 2 (Pd 1− x Au x ) 2 , 28 Eu 2 Al 15 Pt 6 29 and YbAl 3 Pd 2 30 all show valence phase transitions in different expressions. Some review articles summarize at least some aspects of intermetallic cerium, 31–36 europium 37 and ytterbium 38 intermetallics.…”
Section: Introductionmentioning
confidence: 99%
“…EuSi 2 Pd 2 , 25,26 EuSi 2 (Ir 1− x Pd x ) 2 , 27 EuSi 2 (Pd 1− x Au x ) 2 , 28 Eu 2 Al 15 Pt 6 29 and YbAl 3 Pd 2 30 all show valence phase transitions in different expressions. Some review articles summarize at least some aspects of intermetallic cerium, 31–36 europium 37 and ytterbium 38 intermetallics.…”
Section: Introductionmentioning
confidence: 99%
“…The scarce case of trivalent europium in intermetallic phases has recently been reviewed. 10 The present review focuses on intermetallic ytterbium compounds. Here, the configurations 4f 14 (filled f shell; divalent ytterbium; diamagnetic) and 4f 13 (paramagnetic trivalent ytterbium) are the edge states, and static and dynamic ytterbium valence states are observed in-between.…”
mentioning
confidence: 99%
“…In the rare earth series, many examples are known for cerium, where the interplay between the 4f 1 configuration for Ce 3+ and the empty f shell for tetravalent cerium led to a huge number of compounds with broadly varying magnetic and electrical properties, such as long-range magnetic ordering (antiferro-, ferro-, or ferrimagnetism), Kondo-type behavior, heavy Fermion behavior as well as static or dynamic intermediate cerium valence. These many facets of structure–property relationships of cerium intermetallics have been summarized in review articles. While only a few examples are known for divalent samarium (the trivalent state is usually observed), many europium compounds have been studied with respect to their valence behavior. Most of these compounds exhibit the stable half-filled f shell (4f 7 configuration), and consequently, divalent europium is the usual case for intermetallics along with paramagnetism and long-range magnetic ordering, sometimes at comparatively high ordering temperatures. The scarce case of trivalent europium in intermetallic phases has recently been reviewed …”
mentioning
confidence: 99%
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