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Eu M¨ossbauer Spectroscopic Characterization of EuRu4

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151

Eu M¨ossbauer Spectroscopic Characterization of EuRu

4

B

4

and the New Boride EuRuB

4

Thomas Harmening and Rainer P¨ottgen

Institut f¨ur Anorganische und Analytische Chemie and NRW Graduate School of Chemistry,Westf¨alische Wilhelms-Universit¨at M¨unster,Corrensstraße 30, 48149 M¨unster,Germany

Reprint requests to R. P¨ottgen.

E-mail: pottgen@uni-muenster.de Z. Naturforsch.2010,65b,90 – 94;

received September 17,2009

Samples of EuRu4B4 and of the new boride EuRuB4 were prepared from europium,RuB,and RuB4 precur- sor alloys,respectively,in sealed tantalum tubes in an in- duction furnace. EuRu4B4 crystallizes with the LuRu4B4

structure, a = 748.1(1), c = 1502.3(4) pm. The structure of EuRuB4 was refined on the basis of X-ray diffrac- tometer data: Pbam, a = 599.7(1), b = 1160.7(3), c = 358.06(7) pm, wR2 = 0.0691,474 F2 values,and 38 variables. The four crystallographically independent boron sites build up layers which consist of almost regular pen- tagons and heptagons which sandwich the ruthenium and europium atoms,respectively. Within the two-dimensional [B4] networks each boron atom has a slightly distorted trigonal-planar boron coordination with B–B distances in the range 172 – 186 pm. Temperature-dependent 151Eu M¨oss- bauer spectra show stable trivalent europium for EuRu4B4 and EuRuB4.

Key words:Europium,Borides,M¨ossbauer Spectroscopy

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