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7LiNMR STUDY ON SURFACE IONIC DIFFUSION IN NANOCRYSTALLINELiNbO3

Author

Listed:
  • YAO YU

    (National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China)

  • MIN GU

    (National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China)

  • LILI ZHANG

    (National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China)

  • TONG B. TANG

    (Department of Physics, Hong Kong Baptist University, Kowloon, Hong Kong SAR, P. R. China)

  • ZHAOSHENG LI

    (Ecomaterials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China)

  • TAO YU

    (Ecomaterials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P. R. China)

Abstract

By a wet chemical method we have prepared nano-LiNbO3with different crystallite sizes. Their7LiNMR spectra each show, on top of a broad band accompanied by two satellites, a sharp central peak whose strength decreases with growing grain size. On the other hand, for a given sample and as temperature rises, the separation between the two satellites gets wider, but the sharp peak gets narrower. From the satellite splitting we may estimate the molar ratio[Li]/[Nb]inside the nanocrystals, and this ratio is seen to be nearer to unity in a sample of smaller grain size. The sharp peak, indiscernible in bulk (mono- or microcrystalline)LiNbO3, is attributed toLiions in the disproportionally large surface regions of our samples. The narrowness of its linewidth arises from the fast diffusion of these ions caused by high oxygen deficiency on the surface.

Suggested Citation

  • Yao Yu & Min Gu & Lili Zhang & Tong B. Tang & Zhaosheng Li & Tao Yu, 2007. "7LiNMR STUDY ON SURFACE IONIC DIFFUSION IN NANOCRYSTALLINELiNbO3," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 14(04), pages 583-586.
    • Handle: RePEc:wsi:srlxxx:v:14:y:2007:i:04:n:s0218625x07009888
    DOI: 10.1142/S0218625X07009888
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