High-pressure (GPa) impedance measurements based on an indentation-induced local stress field

详细信息    查看全文

• 作者：Yusuke Daiko ; Eri Takahashi ; Norio Hakiri ; Hiroyuki Muto ; Atsunori Matsuda ; Tanguy Rouxel ; Jean-Christophe Sangleboeuf ; Atsushi Mineshige ; Tetsuo Yazawa
• 关键词：Indentation ; Activation volume ; Fuel cell ; YSZ ; Hertzian theory
• 刊名：Solid State Ionics
• 出版年：January, 2014
• 年：2014
• 卷：254
• 期：Complete
• 页码：6-10
• 全文大小：743 K

文摘

Electrical measurements of conducting and dielectric materials under high pressures (in the order of GPa) reveal important information regarding orbital overlaps, electronic states, changes in transition temperatures, and activation volumes (螖V). In this study, we demonstrate a new method for high-pressure impedance measurements, up to 4 GPa, utilizing an indentation-induced local stress field. The current system does not require any pressure mediums or pressure calibrations. The 螖V for O^{2 鈭?/sup> ion conduction in 10 mol% Y₂O₃-doped zirconia at 500 掳C was estimated to be 3.0 cm3 mol鈭?#xA0;1. 螖V increased with increasing temperatures from 500 to 600 掳C. The technique also allows the concurrent determination of the effective elastic modulus by fitting the experimental data obtained from the indentation load-depth profile curve with the Hertzian elastic model. The experimental values were consistent with the theoretical values.}