title: Two new arsenides, Eu7Cu44As23 and Sr7Cu44As23, with a new filled variety of the BaHg11 structure.
abstract: Two new ternary arsenides, namely, Eu7Cu44As23 and Sr7Cu44As23, were synthesized from elements at 800 °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 × 2 × 2 superstructure of the aristotype: space group Fm3̅m, a = 16.6707(2) Å and 16.7467(2) Å, 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.
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University , Moscow, Russia.
authors.forename: Dmitri O
authors.initials: DO
authors.lastname: Charkin
authors.forename: Roman
authors.initials: R
authors.lastname: Demchyna
authors.forename: Yurii
authors.initials: Y
authors.lastname: Prots
authors.forename: Horst
authors.initials: H
authors.lastname: Borrmann
authors.forename: Ulrich
authors.initials: U
authors.lastname: Burkhardt
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schwarz
authors.forename: Walter
authors.initials: W
authors.lastname: Schnelle
authors.forename: Igor V
authors.initials: IV
authors.lastname: Plokhikh
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Kazakov
authors.forename: Artem M
authors.initials: AM
authors.lastname: Abakumov
authors.forename: Dmitry
authors.initials: D
authors.lastname: Batuk
authors.forename: Valery Yu
authors.initials: VY
authors.lastname: Verchenko
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Tsirlin
authors.forename: Caroline
authors.initials: C
authors.lastname: Curfs
authors.forename: Yuri
authors.initials: Y
authors.lastname: Grin
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Shevelkov