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Observation of Li-atomic array in spinel-LiMn2O4 films spin-coated on Si substrates using an atomic force microscopy

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2 Author(s)
Kushida, K. ; College of Engineering and Research Center of Ion Beam Technology, Hosei University, Koganei, Tokyo 184-8584, Japan ; Kuriyama, K.

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The thin films of spinel-LiMn2O4 were synthesized on (100) Si substrates by a sol-gel method and subsequent furnace annealing at various temperatures (300–800 °C) for 30 min. Li and Mn acetates (the atomic ratio Li/Mn of 1:2) were used as a coating solution, and dissolved in methanol with a small amount of a chelating agent. The films were confirmed to be a single phase of LiMn2O4 (space group: Fd3m) by x-ray diffraction studies. The surface morphologies of the films were examined by an atomic force microscopy, showing that the films consisted of bar-shaped crystalline parts. The area of these parts extended with increasing the annealing temperature. In the films annealed at 300 °C, the Li atomic array with slight distortions was observed in an atomically flat surface, which was associated with an unit cell with a lattice spacing of 8.195±0.005 Å on the (100) surface in spinel-LiMn2O4. © 2000 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:76 ,  Issue: 16 )