Electrical conduction and polarization of calcite single crystals
Electrical conduction and polarization of calcite single crystals
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DOI：
10.1007/s00269-012-0530-z
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发表时间：
2012-07
影响因子：
1.4
通讯作者：
N. Wada;N. Horiuchi;Wen Wang;T. Hiyama;Miho Nakamura;A. Nagai;K. Yamashita
中科院分区：
文献类型：
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作者：
N. Wada;N. Horiuchi;Wen Wang;T. Hiyama;Miho Nakamura;A. Nagai;K. Yamashita
用复阻抗和热激去极化电流(TSDC)研究了方解石单晶垂直于晶胞的(00.1)晶面和平行于晶胞的(10.0)晶面和(10.4)解理晶面的电导和极化特性。(0.1)、(10.0)和(10.4)取向的方解石单晶在4 0 0~6 0 0℃的电导率分别为1.16M×10−7~1.05M−5、7.40M×10−8~4.2 7M−6和4.2 7M×10−7~2.86×10−5Ω−1M−1，电导激活能分别为112、103和101kJ−1。TSDC谱证实了方解石晶体的电极化率。(0.1)-、(10.0)-和(10.4)取向方解石的去极化活化能分别为112、119和114kJ·−-1。考虑到方解石的导电和极化过程之间的相关性，我们在氧离子输运的假设下提出了方解石的导电和极化机制。
The electrical conductivity and polarization properties of calcite single crystals with three orientations, namely, a (00.1) plane perpendicular to the crystallographiccaxis (10.0) plane parallel to the crystallographiccaxis, and a (10.4) cleavage plane, were studied by both complex impedance and thermally stimulated depolarization current (TSDC) measurements. Conductivities for (00.1)-, (10.0)-, and (10.4)-oriented single calcite crystals at 400–600 °C were 1.16 × 10−7– 1.05 × 10−5, 7.40 × 10−8– 4.27 × 10−6, and 4.27 × 10−7– 2.86 × 10−5Ω−1m−1, respectively, and the activation energies for conduction were 112, 103, and 101 kJ mol−1, respectively. The TSDC spectra verified the electrical polarizability of calcite crystals. The activation energy for depolarization, estimated from TSDC spectra, of the (00.1)-, (10.0)-, and (10.4)-oriented calcite substrates were 112, 119, and 114 kJ mol−1, respectively. Considering the correlation between the processes of conduction and electric polarization, we proposed the mechanisms of conduction and polarization in calcite on the assumption of oxide ion transport.