The superstructure of semiconducting SmTe{sub 2{minus}x}

Journal Article · Sun Nov 01 04:00:00 EST 1998 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.7891· OSTI ID:305375

Park, S M; Park, S J; Kim, S J ^[1]

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1. Ewha Womans Univ., Seoul (Korea, Republic of). Dept. of Chemistry

SmTe{sub 1.84} was synthesized and the crystal structure was studied by the single-crystal technique. The substructure was isostructural with LaTe{sub 2{minus}x}, where corrugated rock salt LaTe slabs alternate with planar tellurium square lattices. The substructure of SmTe{sub 1.84} is tetragonal anti-Cu{sub 2}Sb type and the superstructure is {radical}5x{radical}5 of the tetragonal subcell. The superstructure is tetragonal, with P4{sub 2}/n symmetry, a = 9.709(1) {angstrom} and c = 18.007(7) {angstrom}. There are both ordered and disordered defects in the Te sheet. The superstructure obtained consists of the three possible stable solutions suggested by Lee and Foran, and all three solutions were found in a single crystal. The resistivity dependence on temperature indicates that SmTe{sub 1.84} is semiconducting, which seems due to structural modulation. The structural stability of the other phases of SmTe{sub n} (n = 1--2) is discussed in terms of temperature and ionic radius ratio.

• OSTI ID: 305375
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 140; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
LATTICE PARAMETERS
MONOCRYSTALS
SAMARIUM TELLURIDES
X-RAY DIFFRACTION