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Abstract:
Two new ternary arsenides, namely, Eu7Cu44As23 and Sr7Cu44As23, were
synthesized from elements at 800 degrees C. Their crystal structure
represents a new filled version of the BaHg11 motif with cubic voids
alternately occupied by Eu(Sr) and As atoms, resulting in a 2 x 2 x 2
superstructure of the aristotype: space group Fm (3) over barm, a =
16.6707(2) angstrom and 16.7467(2) angstrom, respectively. The Eu
derivative exhibits ferromagnetic ordering below 17.5 K. In agreement
with band structure calculations both compounds are metals, exhibiting
relatively low thermopower, but high electrical and low thermal
conductivity.