The Superstructure of Semiconducting SmTe2-x

Seon Mi Park; So Jeong Park; Sung Jin Kim

doi:10.1006/jssc.1998.7891

The Superstructure of Semiconducting SmTe_2-x

Seon Mi Park, So Jeong Park, Sung Jin Kim

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

SmTe_1.84was synthesized and the crystal structure was studied by the single-crystal technique. The substructure was isostructural with LaTe_2-x, where corrugated rock salt LaTe slabs alternate with planar tellurium square lattices. The substructure of SmTe_1.84is tetragonal anti-Cu₂Sb type and the superstructure is √5×√5 of the tetragonal subcell. The superstructure is tetragonal, withP4₂/nsymmetry,a=9.709(1) Å andc=18.007(7) Å. 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_1.84is semiconducting, which seems due to structural modulation. The structural stability of the other phases of SmTe_n(n=1-2) is discussed in terms of temperature and ionic radius ratio.

Original language	English
Pages (from-to)	300-306
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	140
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1998.7891
State	Published - 1 Nov 1998

Bibliographical note

Funding Information:
This work was supported by the fund BSRI-96-3413 and partly by Advanced Material 1996 from the Korean Ministry of Education.

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10.1006/jssc.1998.7891

Cite this

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title = "The Superstructure of Semiconducting SmTe2-x",

abstract = "SmTe1.84was synthesized and the crystal structure was studied by the single-crystal technique. The substructure was isostructural with LaTe2-x, where corrugated rock salt LaTe slabs alternate with planar tellurium square lattices. The substructure of SmTe1.84is tetragonal anti-Cu2Sb type and the superstructure is √5×√5 of the tetragonal subcell. The superstructure is tetragonal, withP42/nsymmetry,a=9.709(1) {\AA} andc=18.007(7) {\AA}. 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 SmTe1.84is semiconducting, which seems due to structural modulation. The structural stability of the other phases of SmTen(n=1-2) is discussed in terms of temperature and ionic radius ratio.",

author = "Park, {Seon Mi} and Park, {So Jeong} and Kim, {Sung Jin}",

note = "Funding Information: This work was supported by the fund BSRI-96-3413 and partly by Advanced Material 1996 from the Korean Ministry of Education.",

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AU - Park, Seon Mi

AU - Park, So Jeong

AU - Kim, Sung Jin

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PY - 1998/11/1

Y1 - 1998/11/1

N2 - SmTe1.84was synthesized and the crystal structure was studied by the single-crystal technique. The substructure was isostructural with LaTe2-x, where corrugated rock salt LaTe slabs alternate with planar tellurium square lattices. The substructure of SmTe1.84is tetragonal anti-Cu2Sb type and the superstructure is √5×√5 of the tetragonal subcell. The superstructure is tetragonal, withP42/nsymmetry,a=9.709(1) Å andc=18.007(7) Å. 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 SmTe1.84is semiconducting, which seems due to structural modulation. The structural stability of the other phases of SmTen(n=1-2) is discussed in terms of temperature and ionic radius ratio.

AB - SmTe1.84was synthesized and the crystal structure was studied by the single-crystal technique. The substructure was isostructural with LaTe2-x, where corrugated rock salt LaTe slabs alternate with planar tellurium square lattices. The substructure of SmTe1.84is tetragonal anti-Cu2Sb type and the superstructure is √5×√5 of the tetragonal subcell. The superstructure is tetragonal, withP42/nsymmetry,a=9.709(1) Å andc=18.007(7) Å. 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 SmTe1.84is semiconducting, which seems due to structural modulation. The structural stability of the other phases of SmTen(n=1-2) is discussed in terms of temperature and ionic radius ratio.

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