The ability of hydroxyapatite (HA) to convert readily into an electret under low polarizing fields (⩽1 kV cm −1 ) makes it as an excellent substitute for electro-active prosthetic implants. In the present study, compacts of electrovector HA and ferroelectric Na 0.5 K 0.5 NbO 3 (NKN) were developed via the spark plasma sintering route. The compacts were then polarized at various polarizing fields of 30, 50, and 90 kV cm −1 , respectively, at 150 °C, for 1 h. Thereafter, samples were depolarized at heating rates of 1, 5, and 10 °C min −1 , respectively. The thermally stimulated depolarization current (TSDC) measurement reveals that the charge density in HA increases from ∼0.2 nC cm −2 to ∼2 µ C cm −2 with an increase in the polarizing field from 30 to 90 kV cm −1 . The dielectric ( ϵ ), as well as the ac conductivity behaviour of unpolarized and polarized (90 kV cm −1 ) HA, are ...

中文翻译：

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电矢量羟基磷灰石和铁电铌酸钾钠陶瓷的极化诱导介电和电响应

羟基磷灰石（HA）在低极化场（⩽1kV cm -1）下容易转化为驻极体的能力使其成为电活性假体植入物的极佳替代品。在本研究中，通过火花等离子体烧结途径开发了电载体HA和铁电Na 0.5 K 0.5 NbO 3（NKN）的压坯。然后将压块分别在30，50和90 kV cm -1的各种极化场上于150℃极化1 h。之后，分别以1、5和10℃min -1的加热速率使样品去极化。热激去极化电流（TSDC）测量表明，随着极化场从30 kV cm -1增加，HA中的电荷密度从〜0.2 nC cm -2增加到〜2 µC cm -2。电介质（ϵ），