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Synthesis, Structural Characterization, Electronic Structure, and Magnetic Properties of the Zintl Phase Eu 10 Cd 6 Bi 12
Author(s) -
Xia Shengqing,
Bobev Svilen
Publication year - 2007
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200700016
Subject(s) - zintl phase , orthorhombic crystal system , crystallography , antiferromagnetism , stacking , crystal structure , materials science , europium , chemistry , condensed matter physics , ion , physics , organic chemistry
A new transition‐metal‐containing Zintl phase, Eu 10 Cd 6 Bi 12 , was synthesized by combining the elements in excess molten Cd. Single‐crystal X‐ray diffraction studies indicated that this compound crystallizes in the orthorhombic space group Cmmm (No. 65) with a =7.840(2), b =24.060(7), and c =4.7809(14) Å. The crystal structure of Eu 10 Cd 6 Bi 12 can be viewed as a stacking of a series of [Cd 6 Bi 12 ] double layers, which are arranged alternately along the b axial direction. The layers are composed of corner‐ and edge‐shared CdBi 4 tetrahedra, a common feature in the crystal chemistry of many transition‐metal Zintl phases. Electronic‐band‐structure calculations confirm the closed‐shell configuration of all constituent elements and corroborate the electron count inferred by the Zintl formalism, that is, [Eu 2+ ] 10 [Cd 2+ ] 6 [Bi 3− ] 8 [Bi 2− ] 4 . Magnetic‐susceptibility measurements confirm the divalency of europium and show the existence of a long‐range antiferromagnetic order of the Eu spins below 12.3 K.