High-pressure dielectric detecting in diamond anvil cell based on in situ impedance measurement

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• 作者：Gang Peng ; Qinglin Wang ; Cailong Liu ; Yonghao Han ; Chunxiao Gao
• 刊名：Chemical Physics Letters
• 出版年：2013
• 出版时间：4 September, 2013
• 年：2013
• 卷：582
• 期：Complete
• 页码：163-166
• 全文大小：1310 K

文摘

Two-electrode configuration was developed for high-pressure dielectric detecting based on in situ impedance measurement in a diamond anvil cell. The electrodes were accurately integrated on diamond anvils with regular shape. The configuration was evaluated and proved to be effective by detecting the dielectric properties of KNbO₃ under high pressure. The first-principles calculations performed on the cubic phase revealed that the pressure decreases the conductivity by increasing the electronic band gap. The dE_g/dP obtained from theoretical method fits quite well with the experimental result dlnR/dP. The pressure-induced enhancement in electron localization causes the decrease of relative permittivity in the cubic phase.