The Dielectric Study of Calcium Hydroxylapatite Doped by Magnesium Ions

Abstract

H YDROXYAPATITE is considered as one of the most effective biomaterials with general formula Ca 10 [ PO 4 [ 6 [0H , 2 [many substances have been used for doping hydroxypatite like F, Mg, CO 3 ,Zn, Bi and Na ,to improve the properties of the HA crystal. In this paper, we discuss the influence of magnesium ions on the electrical properties of the HA crystal. Pure HA (S1) and Mg loaded hydroxy apatite (S2 ,S3 and S4) of different magnesium concentrations have been prepared by wet precipitation method .The dielectric parameters) ε ('and) ε (''measured at different temperature ,relaxation time of relaxation process was calculated from the cole cole plot. The advantages of modulus studies were to recognize the conduction process and study the effect on the frequency and estimate the relaxation frequency. Conduction mechanism has been studied using alternating current measurements, analyzing their dependence on temperature and frequency .The exponent (S) was estimated to recognize the type of conduction .The activation energy studied also to confirm the conductivity measurements. The electrical measurements confirmed that as the addition of Mg increased , the conductivity of the substance would increase and this will improve the bioactivity of HA.

Impact of Mg2+ and Zn2+ Addition on the Structural, Morphological, Physicochemical, Dielectric and Biological Properties of Hydroxyapatite

“…Kanasan and his group observed that the increase in Mg content in HA P elevates the microhardness [11]. Salam and his group noticed that the increase in Mg content in HA P increases the electrical conduction and hence bioactivity of HA P increases [12]. Even though some of the researchers have studied the Zinc and Magnesium doped HA P they used a bulk amount of dopant.…”

Influence of doping chromium ions on the electrical properties of hydroxyapatite

“…Although it has a significant role in bone replacement and substitution, as it forms about 60-70% of human bones [4], its application is limited due to its low brittleness [5,6]. Therefore, several efforts were carried out in order to obtain similar biomaterials which can be used in such a role with a comparably higher order of stiffness with biocompatibility and biodegradability [3,7]. HA was doped and prepared artificially with several substances such as aluminum, iron, magnesium, zinc, strontium and sodium in order to improve its mechanical and electrical properties.…”