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Characterization and identification of berlinite crystals by acoustic microscopy*

Published online by Cambridge University Press:  31 January 2011

J. Gomez Morales ,
R. Rodriguez ,
J. Durand ,
H. Ferdj-Allah ,
Z. Hadjoub ,
J. Attal  and
A. Doghmane
J. Gomez Morales
Affiliation:
Institut de ciencia de materiales de Barcelona, C/MARTI I FRANQUES S/N, 08018 Barcelona, Spain
R. Rodriguez
Affiliation:
Institut de ciencia de materiales de Barcelona, C/MARTI I FRANQUES S/N, 08018 Barcelona, Spain
J. Durand
Affiliation:
Institut de ciencia de materiales de Barcelona, C/MARTI I FRANQUES S/N, 08018 Barcelona, Spain
H. Ferdj-Allah
Affiliation:
Laboratoire de microacoustique, Universite des sciences et technique du Languedoc, Place E. Bataillon, 34095 Montpellier cedex, France
Z. Hadjoub
Affiliation:
Laboratoire de microacoustique, Universite des sciences et technique du Languedoc, Place E. Bataillon, 34095 Montpellier cedex, France
J. Attal*
Affiliation:
Laboratoire de microacoustique, Universite des sciences et technique du Languedoc, Place E. Bataillon, 34095 Montpellier cedex, France
A. Doghmane
Affiliation:
Laboratoire de microacoustique, Universite des sciences et technique du Languedoc, Place E. Bataillon, 34095 Montpellier cedex, France
*
c)Address correspondence to this author.
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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.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2484 - 2489
Copyright
Copyright © Materials Research Society 1991

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Footnotes

*

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

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