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Tags
HERO ID
1015666
Reference Type
Journal Article
Title
Na(2)EuAs(2)S(5), NaEuAsS(4), and Na(4)Eu(AsS(4))(2): Controlling the Valency of Arsenic in Polysulfide Fluxes
Author(s)
Bera, TK; Kanatzidis, MG
Year
2012
Is Peer Reviewed?
Yes
Journal
Inorganic Chemistry
ISSN:
0020-1669
EISSN:
1520-510X
Volume
51
Issue
7
Page Numbers
4293-4299
Language
English
PMID
22414216
DOI
10.1021/ic202781c
Web of Science Id
WOS:000302186600050
Abstract
The reactivity of europium with As species in Lewis basic alkali-metal polysulfide fluxes was investigated along with compound formation and the As(3+)/As(5+) interplay vis-à-vis changes in the flux basicity. The compound Na(2)EuAs(2)S(5) containing trivalent As(3+) is stabilized from an arsenic-rich polysulfide flux. It crystallizes in the monoclinic centrosymmetric space group P2(1)/c. Na(2)EuAs(2)S(5) has [As(2)S(5)](4-) units, built of corner sharing AsS(3) pyramids, which are coordinated to Eu(2+) ions to give a two-dimensional (2D) layered structure. A sodium polysulfide flux with comparatively less arsenic led to the As(5+) containing compounds NaEuAsS(4) (orthorhombic, Ama2) and Na(4)Eu(AsS(4))(2) (triclinic, P1) depending on Na(2)S/S ratio. The NaEuAsS(4) and Na(4)Eu(AsS(4))(2) have a three-dimensional (3D) structure built of [AsS(4)](3-) tetrahedra coordinated to Eu(2+) ions. All compounds are semiconductors with optical energy gaps of ∼2 eV.
Tags
•
Arsenic Hazard ID
1. Initial Lit Search
PubMed
4. Considered through Oct 2015
6. Cluster Filter through Oct 2015
•
Arsenic (Inorganic)
1. Literature
PubMed
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