TY - JOUR
T1 - Scanning tunneling and atomic force microscopy study of the misfit layer compounds (LaS)1.14(NbS2)n (n = 1, 2) and [(Pb,Sb)S]1.14NbS2
AU - Bengel, H.
AU - Jobic, S.
AU - Deudon, C.
AU - Rouxel, J.
AU - Seo, D. K.
AU - Whangbo, M. H.
N1 - Funding Information:
The authors thank A. Lafond for providing them with the X-ray crystal structure of [(Pb,Sb)S] 1.14 NbS 2 , and Y. Moëlo for fruitful discussions. The work at North Carolina State University was supported by the Office of Basic Energy Sciences, Division of Materials Sciences, US Department of Energy, under Grant DE-FG05-86ER45259. H.B. thanks la Région des Pays de la Loire for financial support (Grant 185757F).
PY - 1998/3/12
Y1 - 1998/3/12
N2 - The misfit layer compounds (LaS)1.14(NbS2)n (n = 1, 2) and [(Pb,Sb)S]1.14NbS2 were examined by scanning tunneling microscopy (STM) and atomic force microscopy (AFM). In these compounds the NaCl-type double MS (M = La, Pb, Sb) layers (Q layers) alternate with the NbS2 layers (H layers) made up of NbS6 trigonal prisms. It was possible to record AFM and STM images for only the H layers for (LaS)1.14(NbS2)n, but for both the H and Q layers for [(Pb,Sb)S]1.14NbS2. Partial and total electron density plots of the H and Q layers were calculated to interpret the observed STM and AFM images. The bright spots in the STM and AFM images of the H layer correspond to S atoms, and those of the Q layer to Pb and Sb atoms. The STM images for the Q layers of [(Pb,Sb)S]1.14NbS2 suggest that a short-range ordering of the Pb and Sb atoms occurs in the (Pb,Sb)S sheets of the Q layer.
AB - The misfit layer compounds (LaS)1.14(NbS2)n (n = 1, 2) and [(Pb,Sb)S]1.14NbS2 were examined by scanning tunneling microscopy (STM) and atomic force microscopy (AFM). In these compounds the NaCl-type double MS (M = La, Pb, Sb) layers (Q layers) alternate with the NbS2 layers (H layers) made up of NbS6 trigonal prisms. It was possible to record AFM and STM images for only the H layers for (LaS)1.14(NbS2)n, but for both the H and Q layers for [(Pb,Sb)S]1.14NbS2. Partial and total electron density plots of the H and Q layers were calculated to interpret the observed STM and AFM images. The bright spots in the STM and AFM images of the H layer correspond to S atoms, and those of the Q layer to Pb and Sb atoms. The STM images for the Q layers of [(Pb,Sb)S]1.14NbS2 suggest that a short-range ordering of the Pb and Sb atoms occurs in the (Pb,Sb)S sheets of the Q layer.
KW - Atomic force microscopy
KW - Image simulations
KW - Misfit layered compounds
KW - Scanning tunneling microscopy
KW - Sulphides
KW - Surface defects
KW - Surface structure, morphology, roughness, and topography
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U2 - 10.1016/S0039-6028(97)00882-0
DO - 10.1016/S0039-6028(97)00882-0
M3 - Article
AN - SCOPUS:0032022551
SN - 0039-6028
VL - 400
SP - 266
EP - 276
JO - Surface Science
JF - Surface Science
IS - 1-3
ER -