Nanostructure of Biogenic Calcite and Its Modification under Annealing: Study by High-Resolution X-ray Diffraction and Nanoindentation

Autor:	T. H. Metzger, Peter Fratzl, Igor Zlotnikov, Emil Zolotoyabko, Gerardina Carbone, Yael Politi, Bernd Bayerlein
Rok vydání:	2014
Předmět:	Diffraction Calcite Nanostructure Annealing (metallurgy) High resolution Mineralogy General Chemistry Nanoindentation Condensed Matter Physics Synchrotron law.invention chemistry.chemical_compound chemistry Chemical engineering law X-ray crystallography General Materials Science
Zdroj:	Crystal Growth & Design. 14:5275-5282
ISSN:	1528-7505 1528-7483
DOI:	10.1021/cg501068e
Popis:	We apply advanced X-ray diffraction techniques at synchrotron microfocus beamlines in order to study the local ultrastructure of biogenic calcite with high spatial and angular resolution. Specifically, we investigate individual calcitic prisms extracted from Pinna nobilis mollusk shells with an aim to shed additional light on the structural aspects of organic/inorganic interfaces. We use annealing at elevated temperatures to destroy intracrystalline organics and measure the same prisms before and after annealing to achieve deeper understanding of the internal organization of these nanobiocomposites. Complementary nanoindentation measurements (also performed before and after annealing) allow us to elucidate the role of intracrystalline organics in increased hardness in pristine prisms and hardness reduction after annealing. We found that removal of intracrystalline organics during annealing facilitates generation of well-oriented lattice defects, which reduce the (006) diffraction intensity and are respons...
Databáze:	OpenAIRE
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