The mixed lanthanum dichalcogenide β-LaS1.86(1)Se0.14(1). Synthesis, crystal structure, Raman spectrum and optical band gap

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Abstract

The ternary lanthanum sulfide selenide β-LaS1.86(1)Se 0.14(1) was obtained by reaction of the elements in an NaCl flux. The new compound adopts the β-LnS2 structure type and crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters of a = 814.77(1), b = 1638.46(1) and c = 413.88(1) pm. Raman lines indicate the presence of mixed (S1-ySey)2- dianions with y ≈ 0.14, besides the well known S22- dianions. The band gap of β-LaS1.86(1)Se0.14(1) is 2.5 eV as determined by optical spectroscopy.

Details

Original languageEnglish
Pages (from-to)873-876
Number of pages4
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume66
Issue number9
Publication statusPublished - 2011
Peer-reviewedYes

External IDs

Scopus 80052772472
ORCID /0000-0001-7523-9313/work/142238629

Keywords