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Atomic‐Scale {101¯0} Interfacial Structure in Hydroxyapatite Determined by High‐Resolution Transmission Electron Microscopy
Author(s) -
Sato Kimiyasu,
Kogure Toshihiro,
Iwai Hayato,
Tanaka Junzo
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00578.x
Subject(s) - high resolution transmission electron microscopy , amorphous solid , transmission electron microscopy , materials science , crystallography , atomic units , grain boundary , crystal structure , zone axis , electron microscope , phase (matter) , electron diffraction , microstructure , nanotechnology , optics , chemistry , composite material , diffraction , physics , organic chemistry , quantum mechanics
The atomic structure of {101¯0} interfaces in sintered hydroxyapatite (HAp) was characterized using high‐resolution electron microscopy (HRTEM). When subjected to electron beam radiation parallel to the [0001] zone axis, a characteristic damage of HAp occurred. The damage was identified by hexagonally shaped regions surrounded with {101¯0} planes, in which the crystalline phase was thinned and amorphized. HRTEM study at the crystalline‐amorphous interfaces revealed that the HAp crystal structure was terminated by a plane crossing the hydroxyl columns on which Ca (Ca2 site) and PO 4 tetrahedra were placed. The grain boundaries parallel to the {101¯0} planes were also examined and the structure was identical to that observed in the crystalline‐amorphous interface. The interface structure observed in the crystalline‐amorphous interfaces and grain boundaries is probably a stable atomic arrangement of HAp {101¯0} surfaces with a low surface energy.