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

Autor:	Helmut Cölfen, Hans-Beat Bürgi, Dmitry Chernyshov, Michal Stekiel, Aleksandra Chumakova, Alexei Bosak, Björn Wehinger, Bjoern Winkler
Rok vydání:	2022
Předmět:	Sea Urchins ddc:540 Materials Chemistry Metals and Alloys Animals Nanoparticles biogenic calcite X-ray diffuse scattering inelastic X-ray scattering mechanical properties Atomic and Molecular Physics and Optics Calcium Carbonate Electronic Optical and Magnetic Materials
Zdroj:	Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 78:356-358
ISSN:	2052-5206
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3901d364a60aed39c69e0a1516feafc https://doi.org/10.1107/s2052520622000634 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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