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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2006     Display Documents

ID: 306265.0, MPI für Festkörperforschung / FKF Publikationen 2006
KCaEr2CuS5: A new pentanary rare-earth layered chalcogenide without substitutional disorder
Authors:Zeng, H. Y.; Mattausch, Hj.; Simon, A.; Zheng, F. K.; Dong, Z. C.; Guo, G. C.; Huang, J. S.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Inorganic Chemistry
Issue / Number:19
Start Page:7943
End Page:7946
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:A new pentanary rare-earth chalcogenide without substitutional
disorder, KCaEr2CuS5, was obtained from reaction of the Er-Ca-Cu-S
precursor with KBr flux by either a two-step flux method or a direct
reaction of the mixture of the binary components (1Cu(2)S: 2Er(2)S(3):
3CaS) with excess KBr as flux. KCaEr2CuS5 crystallizes in the
orthorhombic space group Cmcm(No. 63) with a = 3.9327(5) angstrom, b =
13.410(2)angstrom, c = 17.042(2) angstrom, V = 898.8(3) angstrom(3), Z
= 4, R = 0.0632, and R-w = 0.0627. The KCaEr2CuS5 structure consists of
four different building units: ErS6 octahedra, CaS6 octahedra, CuS4
tetrahedra, and KS6 trigonal prisms; it is characterized by
(2)(infinity)[Er2CuS5](3-) layers that are formed by the
interconnection of double ErS6 octahedral chains with CuS4 tetrahedral
chains in the a-c plane. K+ and Ca2+ cations are located in the
cavities defined by S2- anions between the (2)(infinity)[Er2CuS5](3-)
layers. KCaEr2CuS5 is a semiconductor with an estimated band gap of 2.4
eV and shows a Curie-Weiss paramagnetic behavior in the 5-300 K range.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Festkörperforschung
External Affiliations:Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fujian 350002, Peoples R China.
; Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.
; Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.
Identifiers:ISI:000240403500054 [ID No:1]
ISSN:0020-1669 [ID No:2]
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