TSDC and impedance spectroscopy measurements on hydroxyapatite, β-tricalcium phosphate and hydroxyapatite/β-tricalcium phosphate biphasic bioceramics

Synthesis and Characterization of Sintered Sr/Fe-Modified Hydroxyapatite Bioceramics for Bone Tissue Engineering Applications

“…This phenomenon followed the fact that in the low-frequency range, the polarization obeyed the modification of the applied field without any lag, whereas at the larger frequency domain, the dipole moment of the hydroxyl (OH – ) ions could not stand with the field modification that resulted in lower polarization. As a result, the dielectric constant decreased with increasing frequency, which is in accordance with the previous reports. , Generally, low porosity and low defects could imply higher density, eventually leading to an optimum electrical response of the prepared samples. In this study, the dielectric constant value of pure-phase HAp was sandwich those of single Sr- or Fe-substituted HAp groups.…”

“…In the accessible literature, the Sr- or Fe-doped HAp structure has shown increased dielectric constant than pristine HAp, , while the dielectric constant behavior of the βTCP is yet to be explored. Recently, Prezas et al have reported that biphasic HAp/βTCP bioceramic exhibited larger dielectric constant values as a function of temperature at a fixed 1 × 10 3 Hz frequency, relative to the solo phase nature of HAp and βTCP . In this viewpoint, further efforts are required for better clarification of the dielectric properties of Sr/Fe co-substituted HAp bioceramics.…”

“…As a result, the dielectric constant decreased with increasing frequency, which is in accordance with the previous reports. 45,46 Generally, low porosity and low defects could imply higher density, eventually leading to an optimum electrical response of the prepared samples. In this study, the dielectric constant value of pure-phase HAp was sandwich those of single Sr-or Fe-substituted HAp groups.…”

“…Recently, Prezas et al have reported that biphasic HAp/βTCP bioceramic exhibited larger dielectric constant values as a function of temperature at a fixed 1 × 10 3 Hz frequency, relative to the solo phase nature of HAp and βTCP. 46 In this viewpoint, further efforts are required for better clarification of the dielectric properties of Sr/Fe co-substituted HAp bioceramics. The variation in the imaginary part of the dielectric constant, often called as dielectric loss, obeys a similar pattern to dielectric constant (Figure 5).…”

Synthesis and Characterization of Thermally Stable Hydroxyapatite

“…The most promising replacement biomaterials are those with bioactive properties such as calcium phosphate-based bioceramics groups (hydroxyapatite HA (Ca10(PO4)6(OH2) and tricalcium phosphate TCP), owing to their good properties such as biocompatibility, osteoconductivity, bioactivity, non-toxicity and noninflammatory [1,2]. Therefore, its synthesis has received a great deal of interest both in academic and industrial areas [3][4][5][6][7]. In general, HA is prepared by two main approaches.…”