INTERACTION BETWEENLiANDNaINTERCALATED INTO1T-TaSe2LAYER COMPOUNDS

M. Kamaratos, C. A. Papageorgopoulos, D. C. Papageorgopoulos, D. Tonti, C. Pettenkofer and W. Jaegermann
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M. Kamaratos: Department of Physics, University of Ioannina, P. O. Box 1186 451 10, Ioannina, Greece
C. A. Papageorgopoulos: Department of Physics, University of Ioannina, P. O. Box 1186 451 10, Ioannina, Greece
D. C. Papageorgopoulos: FOM Institute for Atomic and Molecular Physics, Kruislaan 407 1098, SJ Amsterdam, The Netherlands
D. Tonti: Hahn-Meitner Institut, Gleinicker Strasse 100 D-14109 Berlin, Germany
C. Pettenkofer: Hahn-Meitner Institut, Gleinicker Strasse 100 D-14109 Berlin, Germany
W. Jaegermann: Fachberaich 21, Material wissenschaften, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany

Surface Review and Letters (SRL), 1999, vol. 06, issue 02, 205-211

Abstract: In this work we study the adsorption of Li on a Na-intercalatedTaSe2(0001)and, reversibly, the deposition of Na on a Li-intercalatedTaSe2(0001)surface. The intercalation occurred by deposition of the alkali elements onto the basal plane of theTaSe2. The experiment was performed in UHV by soft X-ray photoelectron spectroscopy, using synchrotron radiation as excitation source. Lithium intercalation into1T-TaSe2leads to a phase transition of the substrate from 1T to 2H polytypism. Lithium and sodium appear to compete in the intercalation process. Sodium pushes the preintercalated Li deeper into the bulk of the substrate, whereas, in the case of Li on Na-intercalatedTaSe2, an exchange reaction takes place and part of the Na deintercalates.

Date: 1999
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DOI: 10.1142/S0218625X99000238

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