Mesocrystalline structure and mechanical properties of biogenic calcite from sea urchin spine

Author:

Cölfen HelmutORCID,Bürgi Hans-BeatORCID,Chernyshov DmitryORCID,Stekiel MichalORCID,Chumakova Aleksandra,Bosak AlexeiORCID,Wehinger BjörnORCID,Winkler Bjoern

Abstract

Using X-ray scattering, we measured detailed maps of the diffuse scattering intensity distribution and a number of phonon dispersion branches for a single crystal of inorganically formed natural calcite and for high-quality mesocrystals of biogenic calcite from a Mediterranean sea urchin spine. A comparison shows that the known differences in the mechanical properties between the `strong' biogenic and `brittle' abiotic material should be attributed to the mesoscopic architecture of the crystal rather than to a modification of the calcite crystal structure. The data are rationalized by comparing them to the results of ab initio model calculations of lattice dynamics. For the mesocrystal, they are augmented by the evaluation of the faceting of the constituent nanocrystals.

Funder

Deutsche Forschungsgemeinschaft

Publisher

International Union of Crystallography (IUCr)

Subject

Materials Chemistry,Metals and Alloys,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

Reference12 articles.

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