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Characterization and identification of berlinite crystals by acoustic microscopy

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Abstract

Berlinite crystals grown in H3PO4, HCl, H3PO4/HCl, H2SO4/HCl, or H3PO4/HCl/H2SO4 solvents are characterized by acoustic microscopy techniques. Surface and subsurface defects can be visualized via acoustical images, whereas elastic parameters of the crystal can be measured on a microscopic scale. They prove to be of great importance in the identification of not only crystal orientations but of preparation methods as well. We show, for example, that a growth in sulfuric and phosphoric mediums improves mechanical behavior of berlinite crystals. Moreover, it seems that anisotropy plays a fundamental role in this characterization technique with an appearance or a disappearance of specific modes.

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Author notes

  1. J. Durand

    Present address: Current address: Laboratoire De Physicochimie des Materiaux, ENSCM, 8 rue de l’Ecole Normale, Montpellier cedex, 34053, France

  2. Z. Hadjoub & A. Doghmane

    Present address: Current address: Laboratoire des Semiconducteurs, Institut de Physique BP 12, Universite de Annaba, Algeria

Authors and Affiliations

  1. Institut de ciencia de materiales de Barcelona, C/MARTI I FRANQUES S/N, Barcelona, 08018, Spain

    J. Gomez Morales, R. Rodriguez & J. Durand

  2. Laboratoire de microacoustique, Universite des sciences et technique du Languedoc, Place E. Bataillon, Montpellier cedex, 34095, France

    H. Ferdj-Allah, Z. Hadjoub, J. Attal & A. Doghmane

Authors
  1. J. Gomez Morales
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  2. R. Rodriguez
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  3. J. Durand
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  4. H. Ferdj-Allah
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  5. Z. Hadjoub
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  6. J. Attal
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  7. A. Doghmane
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Additional information

This work was carried out in order to establish an “Accord Program Franco-Espagnol” in connection with the CERMATGEP.

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Morales, J.G., Rodriguez, R., Durand, J. et al. Characterization and identification of berlinite crystals by acoustic microscopy. Journal of Materials Research 6, 2484–2489 (1991). https://doi.org/10.1557/JMR.1991.2484

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  • DOI: https://doi.org/10.1557/JMR.1991.2484

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