Conductivity in human tooth enamel

被引:12
|
作者
Reyes-Gasga, J
García, R
Alvarez-Fregoso, O
Chávez-Carvayar, JA
Vargas-Ulloa, LE
机构
[1] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
[2] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
[3] Univ Nacl Autonoma Mexico, Fac Odontol, Div Estudios Posgrado, Mexico City 04510, DF, Mexico
关键词
D O I
10.1023/A:1004540617013
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
When human tooth enamel is heated either in vacuum or air it presents drastic changes in electrical susceptibility, conductivity and structural properties. In this paper we report an insulator-conductive transition which is observed in air around 350 degrees C where enamel conductivity changes drastically and its electrical resistance decreases from 10(15) to 10(5) Omega; that is, it goes from an insulator to a super-ionic ceramic behavior. This transition, first evidenced in vacuum by electron microscopy observations, is now completely determined by a.c. impedance spectroscopy technique and its characterization was carried out as a function of the frequency and temperature. X-ray in situ heating diffraction experiments show that there is no structural phase transition during a wide range of temperature including the one where the conductivity transition occurs. (C) 1999 Kluwer Academic Publishers.
引用
收藏
页码:2183 / 2188
页数:6
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