Influence of defects on dipolar reorientations of bioelectrets: hydroxyapatites

Author

Bennis, A. ; Hitmi, N. ; Vignoles, M. ; Heughebaert, M. ; Lamure, A. ; Lacabanne, C.

Author_Institution

Mohammed V Univ., Rabat, Morocco

fYear

1991

fDate

25-27 Sep 1991

Firstpage

732

Lastpage

737

Abstract

The natural filler of calcified tissues is nonstoichiometric apatites. These apatites are characterized by a Ca/P ratio larger or lower than 1.66 (stoichiometric ratio). Defects responsible for modification of the crystalline structure can be eliminated by annealing apatites at various temperatures. Hence, pretreated samples of nonstoichiometric apatites have been studied by thermally stimulated current (TSC) spectroscopy. Analysis of polarization phenomena shows the existence of either monophasic or biphasic structure. Information on localization and interaction of defects with structural ions is also provided

Keywords

annealing; bioelectric phenomena; crystal defects; dielectric polarisation; electrets; molecular reorientation; stoichiometry; thermally stimulated currents; Ca/P ratio; TSC; annealing; bioelectrets; biphasic structure; calcified tissues; crystalline structure; defect localisation; defects; dipolar reorientations; filler; hydroxyapatites; monophasic structure; nonstoichiometric apatites; polarization phenomena; pretreated samples; thermally stimulated current; Annealing; Calcium; Crystallization; Crystallography; Fasteners; Humans; Polarization; Spectroscopy; Teeth; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)

Conference_Location

Berlin

Print_ISBN

0-7803-0112-9

Type

conf

DOI

10.1109/ISE.1991.167303

Filename

167303