Eu2Ru3Si5 and Eu2Ir3Ga5 – first europium compounds with U2Mn3Si5-type structure but different europium valence.

Autor:	Seidel, Stefan, Harmening, Thomas, Kösters, Jutta, Koldemir, Aylin, Pröbsting, Wilma, Engelbert, Simon, Pöttgen, Rainer
Předmět:	EUROPIUM compounds EUROPIUM MOSSBAUER spectroscopy TRANSITION metals X-ray diffractometers
Zdroj:	Zeitschrift für Naturforschung B: A Journal of Chemical Sciences; May2023, Vol. 78 Issue 5, p293-300, 8p
Abstrakt:	The silicide Eu2Ru3Si5 was synthesized from the elements in a sealed tantalum tube in a high-frequency furnace, while the gallide Eu2Ir3Ga5 was obtained by arc-melting. Both structures were refined from single-crystal X-ray diffractometer data: P4/mnc, a = 1072.69(8), c = 569.55(5) pm, wR = 0.0453, 617 F2 values, 31 variables for Eu2Ru3Si5 and a = 1122.18(7), c = 583.17(4) pm, wR = 0.0546, 729 F2 values, 31 variables for Eu2Ir3Ga4.95(1). The gallide shows small defects on one 8h site. The transition metal atoms in Eu2Ru3Si5 and Eu2Ir3Ga5 have octahedral p element coordination. These Ru@Si6 respectively Ir@Ga6 polyhedra are condensed to three-dimensional [Ru3Si5]6− respectively [Ir3Ga5]4− polyanionic networks. The ground states of Eu(III) in Eu2Ru3Si5 and Eu(II) in Eu2Ir3Ga5 were determined by 151Eu Mössbauer spectroscopy. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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