Reorientable electric dipoles and cooperative phenomena in human tooth enamel.
Reorientable electric dipoles and cooperative phenomena in human tooth enamel.
复制标题
人类牙釉质中的可重新定向电偶极子和合作现象。
DOI：
10.1007/bf02556603
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发表时间：
1986
影响因子：
4.2
通讯作者：
Young,RA
中科院分区：
文献类型：
--
作者：
Hitmi,N;Lamure-Plaino,E;Lamure,A;LaCabanne,C;Young,RA
用热刺激电流的分数极化形式(TSC)初步研究了人牙釉质(TE)和羟基磷灰石(OHAp)的电偶极子重定向性。可重定向的偶极子是结构上的OH−离子。OHAp在211.5℃和356C时表现出补偿现象，这与六方晶型相对于单斜晶型分别变为准静态稳定和动态稳定有关。TE试件在不同温度下进行了预处理。所有这些都显示出合作运动的开始，这些运动可以在相同的温度下准静态地稳定六角形，大约212°C，OHAp也是如此，即使TE已经静态地稳定在六角形中。部分不符合212℃补偿的TSC光谱随前处理温度的升高而逐渐变化。结合水的损失被认为是大多数这些变化的最可能的原因。这项工作显示了TSC作为进一步定量研究TE的工具的相当大的前景。
A preliminary investigation of electric dipole reorientability in human tooth enamel (TE) in comparison to that in hydroxyapatite (OHAp) has been made with the fractional-polarization form of the thermally stimulated currents (TSC) method. The reorientable dipoles are the structural OH−ions. The OHAp exhibited compensation phenomena at 211.5°C and at 356°C which are associated here with the hexagonal form becoming quasi-statically stabilized and dynamically stabilized, respectively, against the monoclinic form. TE specimens were pretreated at various temperatures. All showed the onset of cooperative motions that could quasi-statically stabilize the hexagonal form at the same temperature, approximately 212°C, as did OHAp, even though the TE was already statically stabilized in the hexagonal form. Parts of the TSC spectra that did not conform to the 212°C compensation changed progressively with pretreatment temperature. Loss of incorporated H2O is identified as the most probable cause of most of these changes. This work shows considerable promise for TSC as a tool for further quantitative investigation of TE.