Premium
The Zintl Phase Eu 2 Si
Author(s) -
Mishra Ratikanta,
Hoffmann RolfDieter,
Pöttgen Rainer,
Trill Henning,
Mosel Bernd D.
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200205)628:4<741::aid-zaac741>3.0.co;2-1
Subject(s) - europium , zintl phase , crystallography , chemistry , silicon , single crystal , analytical chemistry (journal) , crystal structure , ion , organic chemistry , chromatography
The Zintl phase Eu 2 Si was synthesized from elemental europium and silicon in a sealed tantalum tube in a high‐frequency furnace at 1270 K and subsequent annealing at 970 K. Investigation of the sample by X‐ray powder and single crystal techniques revealed: Co 2 Si ( anti ‐PbCl 2 ) type, space group Pnma, a = 783.0(1), b = 504.71(9), c = 937.8(1) pm, wR2 = 0.1193, 459 F 2 values and 20 variables. The structure contains two europium and one silicon site. 151 Eu Mössbauer spectroscopic data show a single signal at an isomer shift of −9.63(3) mm/s, compatible with divalent europium. Within the Zintl concept electron counting can be written as (2Eu 2+ ) 4+ Si 4− , in agreement with the absence of Si‐Si bonding. Each silicon atom has nine europium neighbors in the form of a tri‐capped trigonal prism. The silicon coordinations of the Zintl phases Eu 2 Si, Eu 5 Si 3 , EuSi, and EuSi 2 are compared.