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Evidence of the surface layer in tungstated zirconia

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Abstract

We characterized the structure of tungstated zirconia (WOx–ZrO2) by combining X-ray diffraction, Raman spectroscopy and High Resolution Electron Microscopy (HREM) together with molecular simulations. Our results indicate that the structure of this material consists of metastable tetragonal ZrO2 nanoparticles (<20 nm in diameter) covered by a few-nanometers thick low-crystallinity surface layer formed by tungsten oxospecies (WOx). Although the X-ray diffraction pattern matched the spectra of the tetragonal ZrO2 bulk phase the lattice fringes of the ZrO2 nanoparticles observed by HREM were locally distorted, presumably as a result of the interaction with the surface WOx layer. The local interplanar distances of the surface layer were close to those present in different bulk tungsten oxocompounds, and its variability was also an indication of the WOx–ZrO2 interaction. Molecular simulations corroborated our structural assignment. The results presented here are a direct evidence for the presence of a surface WOx layer in the case of WOx–ZrO2.

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Authors and Affiliations

  1. Instituto Mexicano del Petróleo, Eje Lázaro Cárdenas 152, San Bartolo Atepehuacan, 07730, México, D.F., Mexico

    E. Torres-García, J.A. Ascencio & R. Pérez

  2. Instituto de Investigaciones Metalúrgicas, UMSNH, Santiago Tapia 403, 58000, Morelia, Mich., Mexico

    G. Rosas

  3. Depto. de Física, Universidad A. Metropolitana, Iztapalapa, A.P. 55-534, 09340, México, D.F., Mexico

    E. Haro-Poniatowski

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  1. E. Torres-García
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  2. G. Rosas
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  3. J.A. Ascencio
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  4. E. Haro-Poniatowski
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  5. R. Pérez
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Correspondence to E. Torres-García.

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PACS

68.35.Bs; 81.05.Ys; 82.65.Dp

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Torres-García, E., Rosas, G., Ascencio, J. et al. Evidence of the surface layer in tungstated zirconia. Appl. Phys. A 79, 401–406 (2004). https://doi.org/10.1007/s00339-004-2643-9

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  • DOI: https://doi.org/10.1007/s00339-004-2643-9

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