Characterization and identification of berlinite crystals by acoustic microscopy
- 1 November 1991
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 6 (11) , 2484-2489
- https://doi.org/10.1557/jmr.1991.2484
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.Keywords
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