Journal
DALTON TRANSACTIONS
Volume 45, Issue 13, Pages 5775-5782Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt00193a
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Funding
- National Natural Science Foundation of China [21225104, 21233009, 21301175, 21571020, 91422303]
- Natural Science Foundation of Fujian Province [2015J01071]
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Five new quaternary rare-earth selenides, Cs[RE9Cd4Se18] (RE = Tb-Tm), which are the first examples with closed cavities in the quaternary A/RE/Cd/Q (A = alkali metal; RE = rare earth metal; Q = chalcogenide) system, have been synthesized by high-temperature solid state reactions with a modified reactive CsCl flux. Single crystal X-ray diffraction analyses show that these isostructural materials adopted a known BaV13O18-structure type in the trigonal space group R (3) over bar (no. 148) with cell parameters of a = 17.773(2)-17.489(6)angstrom, c = 9.918(2)-9.765(5)angstrom and Z = 3. The structure is composed of MSe6 (centered by disordered RE and Cd) and RESe6 octahedra that share edges to form a 3D framework, inside which the cuboctahedral Se-12 closed cavities accommodate Cs cations. It is interesting to note that these compounds exhibit atomic distributions different from the recently reported Mn-compounds Cs[RE9Mn4Se18]. In Cd-compounds, Cd and RE atoms are statistically mixed only at one of the 18f sites; the rest of the RE atoms are fully occupied at the two framework sites: 18f and 3a. Moreover, the theoretical studies have greatly aided the understanding of the site-preference about a Cd atom in the 3D framework. The synthesis, structural characterization, electronic band structure as well as physical properties of the title compounds are also discussed.
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