Dielectric Spectroscopic Studies of Pure and Ionic Substituted Calcium Pyrophosphate Dihydrate Nano-particles

Abstract

Calcium pyrophosphate – a kind of calcium phosphate are the non-viable bio-materials, generally, possessing osteo-conductivity, non-toxicity, non- inflammatory and non-immunogenicity. These bio-materials find important clinical applications such as bone substitution materials and in dentistry.   Ionic  substitutions have been used as a tool to improve the biological performance of such bio materials, particularly; zinc improves the activity of osteo-blasts and promotes bone regeneration. Electric field can accelerate the healing of the fractures and enhances rate of bone growth, the impedance spectroscopic study is an  important tool investigate the electrical behavior of these biomaterials. Pure and Zn doped Calcium Pyrophosphate Dihydrate (CPPD) nano-particles with [Zn]/[Ca] molar ratio as 0 % (Pure CPP), 2 %,5% and,10% were synthesized by surfactant mediated approach. The nano structured nature of the samples was confirmed by applying Scherrer’s formula to Powder XRD patterns and by TEM study. The synthesized samples were characterized by dielectric spectroscopic studies as a function of frequency at different temperatures. The variations in various dielectric parameters like real and imaginary part of dielectric constant, a.c. conductivity and dielectric loss with the frequency of applied field in 3.2 kHz to 32 MHz range and within a temperature range from 30 0C to 120 0C were studied. Activation energy was calculated using a.c. conductivity data. The results are discussed.