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Twin density of aragonite in molluscan shells characterized using X-ray diffraction and transmission electron microscopy
Kogure, T.; Suzuki, M.; Kim, H.; Mukai, H.; Checa, A.G.; Sasaki, T.; Nagasawa, H. (2014). Twin density of aragonite in molluscan shells characterized using X-ray diffraction and transmission electron microscopy. Journal of Crystal Growth 397: 39-46. http://dx.doi.org/10.1016/j.jcrysgro.2014.03.029
In: Journal of Crystal Growth. ELSEVIER SCIENCE BV: Amsterdam. ISSN 0022-0248; e-ISSN 1873-5002
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoord
    Marien/Kust
Author keywords
    A1. Biocrystallization; A1. Defects; A1. {110} twin; A1. X-ray diffraction; B1. Aragonite; B1. Calcium compounds
Auteurs  Top 
  • Kogure, T.
  • Suzuki, M.
  • Kim, H.
  • Mukai, H.
  • Checa, A.G.
  • Sasaki, T.
  • Nagasawa, H.
Abstract
    {110} twin density in aragonites constituting various microstructures of molluscan shells has been characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM), to find the factors that determine the density in the shells. Several aragonite crystals of geological origin were also investigated for comparison. The twin density is strongly dependent on the microstructures and species of the shells. The nacreous structure has a very low twin density regardless of the shell classes. On the other hand, the twin density in the crossed-lamellar (CL) structure has large variation among classes or subclasses, which is mainly related to the crystallographic direction of the constituting aragonite fibers. TEM observation suggests two types of twin structures in aragonite crystals with dense {110} twins: rather regulated polysynthetic twins with parallel twin planes, and unregulated polycyclic ones with two or three directions for the twin planes. The former is probably characteristic in the CL structures of specific subclasses of Gastropoda. The latter type is probably related to the crystal boundaries dominated by (hk0) interfaces in the microstructures with preferred orientation of the c-axis, and the twin density is mainly correlated to the crystal size in the microstructures.
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