Tem Observance and Analysis of the (000l), l=2n+l, Forbidden Reflections in Synthetic and Biological Hydroxyapatites

Abstract

AbstractThe systematic appearance of (000l), l=2n+1, forbidden reflections in the electron diffraction patterns of hydroxyapatite, both synthetic and natural (human tooth enamel), is discussed. Structural disorder, double diffraction, and modulated structures and are discussed as possible causes. Structural disorder and modulated structure could be responsible for the rupture of the reported symmetry, in which oxygen and hydrogen perform an important role.