Title: Enhanced dielectric constant and structural transformation in Fe-doped hydroxyapatite synthesized by wet chemical method Author:Singh, Brajendra; Tandon, Aditya; Pandey, Anand; Singh, Priyanka Subject:Hydroxyapatites – Methods ; Hydroxyapatites – Electric Properties ; Magnetic Fields – Methods ; Magnetic Fields – Electric Properties; Description:
We report the synthesis of single-phase Fe-doped hydroxyapatite (HAp) [Ca 10− x Fe x (PO 4 ) 6 (OH) 2 (0.0 ≤ x ≤ 0.3)] and enhanced dielectric constant of HAp with Fe doping. Rietveld analysis shows the change in x -axis-oriented lattice constant a in Fe-doped x = 0.1 and 0.3 compositions in comparison with parent HAp, while z -axis-oriented lattice constant c does not show any considerable change. Analysis of absorbance data shows two new symmetric stretching peaks for Fe-doped x = 0.1 and x = 0.3 compositions, which are not present in parent HAp. Magnetic measurements show paramagnetic behaviour of all Fe-doped samples at 300 K. Fe-doped Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 composition shows increase in impedance in the presence of 500 Oersted (Oe) applied magnetic field in comparison with impedance in the absence of magnetic field. Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 composition shows increase in dielectric constant in comparison with parent HAp in frequency range 5–35 MHz. Fe-doped Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 composition shows ~ 970% colossal magnetoimpedance at 100 Hz and ~ 200% at 20 MHz frequency.
Is part of:
Journal of Materials Science, 2018, Vol.53(12), pp.8807-8816
0022-2461 (ISSN); 1573-4803 (E-ISSN); 10.1007/s10853-018-2225-4 (DOI)
Aquaporin-4 Inhibition Mediates Piroxicam-Induced Neuroprotection against Focal Cerebral Ischemia/Reperfusion Injury in Rodents