HRTEM study of individual bone apatite nanocrystals reveals symmetry reduction with respect to P63/m apatite

Viktória Kovács Kis, Zsolt Czigány, Zsolt Dallos, Dávid Nagy, I. Dódony

Research output: Contribution to journalArticle

Abstract

In this study we present the first crystal structure model for bone apatite based on the analysis of individual nanocrystals by high resolution transmission electron microscopy (HRTEM). Crystallographic image processing of the obtained HRTEM images from different projections indicates symmetry reduction with respect to P63/m stoichiometric apatites and the presence of threefold symmetry along the c axis. Based on HRTEM observations and the measured Ca/P = 2 ratio we propose a structural model with phosphate-to-carbonate substitution and O vacancies localized along c axis, which explains the observed loss of 63 screw axis parallel, and the shift of mirror plane perpendicular to the c axis. Also, the presence of non-equivalent (010) surfaces has been proven. These results on the atomic structure of bone apatite nanocrystals contribute to the understanding of their biochemically controlled nucleation processes.

Original languageEnglish
Article number109966
JournalMaterials Science and Engineering C
Volume104
DOIs
Publication statusPublished - Nov 1 2019

Fingerprint

Apatites
Apatite
Crystal symmetry
apatites
High resolution transmission electron microscopy
Nanocrystals
bones
nanocrystals
Bone
transmission electron microscopy
high resolution
symmetry
Crystal atomic structure
Carbonates
Vacancies
Mirrors
Phosphates
Image processing
screws
Nucleation

Keywords

  • Atomic structure
  • Biomineralization
  • Bone apatite
  • HRTEM
  • Nanocrystals

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

HRTEM study of individual bone apatite nanocrystals reveals symmetry reduction with respect to P63/m apatite. / Kis, Viktória Kovács; Czigány, Zsolt; Dallos, Zsolt; Nagy, Dávid; Dódony, I.

In: Materials Science and Engineering C, Vol. 104, 109966, 01.11.2019.

Research output: Contribution to journalArticle

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