Electrical polarization and ionic conduction properties of β-tricalcium phosphate bioceramics with controlled vacancies by sodium ion substitution
Electrical polarization and ionic conduction properties of β-tricalcium phosphate bioceramics with controlled vacancies by sodium ion substitution
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钠离子取代控制空位β-磷酸三钙生物陶瓷的电极化和离子传导性能
DOI：
10.1016/j.ceramint.2022.02.117
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发表时间：
2022
影响因子：
5.2
通讯作者：
Yamashita Kimihiro
中科院分区：
文献类型：
--
作者：
Nozaki Kosuke;Nagai Akiko;Endo Takayuki;Hashimoto Kazuaki;Yamashita Kimihiro
为了了解β-磷酸三钙作为一种先进的生物材料的极化机理，合成了具有可控晶格空位的Na离子取代的β-Ca3(PO4)2(Na-β-TCPs)陶瓷，并用Rietveld方法进行了结构细化。Rietveld分析表明，随着Na取代度的增加，β-TCP结构中的Ca(4)位的空位和Ca(4)位的空位减少。用复阻抗法测得的电导率和由Cole-Cole图计算的活化能随着Na取代量的增加和空位的减少而迅速下降到一个恒定值。电极化的Na-β-TcP的热激去极化电流曲线在530-610℃出现一个大的峰，但累积电荷随着Na离子的增加和空位的减少而减少，最高可达2.37nmol%，之后趋于恒定。这些结果与在高温下沿外极化场方向排列的Ca~(2+)离子与它们的空位之间形成偶极矩的假设是一致的。我们的结论是，电场极化导致β-TcP中的大量存储电荷是由于β-Tcp结构中钙离子和Ca(4)位空位的低占位所致，而不是像以前报道的那样。
With the aim to understand electric polarization mechanisms of β-tricalcium phosphate as an advanced biomaterial, Na ion-substituted β-Ca3(PO4)2(Na-β-TCPs) ceramics with controlled lattice vacancies were synthesized and structural refinement was performed by the Rietveld method. The Rietveld analysis revealed that Ca and vacancies at Ca(4) sites in the β-TCP structure decreased with an increase in Na substitution. Electrical measurements by the complex impedance method revealed that the conductivity and the activation energy calculated from Cole-Cole plots rapidly decreased to a constant value with an increase in Na substitution and decrease in vacancies. The thermally stimulated depolarization current (TSDC) curve of the electrically polarized Na-β-TCP showed one large peak at 530–610 °C. However, the accumulated charge decreased with an increase in Na ions and decrease in vacancies up to 2.37 mol%, after which it became constant. These results are consistent with the presumed formation of a dipole moment between aligned Ca2+ions and their vacancies along the direction of the external polarization field applied at high temperature. We conclude that the large amount of stored charge in β-TCP caused by electrical polarization is due to the low site occupancy of calcium ions and vacancies at Ca(4) sites in the β-TCP structure, which is not the case for hydroxyapatite (HAp), as previously reported.
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