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Correlation of the orientation of stacked aragonite platelets in nacre and their connection via mineral bridges

: Gries, K.; Kröger, R.; Kübel, C.; Schowalter, M.; Fritz, M.; Rosenauer, A.


Ultramicroscopy 109 (2009), No.3, pp.230-236
ISSN: 0304-3991
Journal Article
Fraunhofer IFAM ()

In this work, we studied the correlation of the orientation of stacked aragonite platelets of Hatiotis laevigata nacre, using selected area diffraction (SAD) in transmission electron microscopy (TEM). From the position of the center of Laue circle (COLQ within the diffraction patterns the tilt angles of the investigated platelets relatively to a reference platelet (oriented in zone axis) are determined. The strong correlation of the platelets supports the existence of mineral bridges, which connect the stacked platelets and enable a transfer of the platelet orientation during growth. Electron tomography and subsequent reconstruction of the obtained data yield information about the shape of the mineral bridges. The crystalline structure of the material within the mineral bridges was investigated by high resolution TEM (HRTEM).