High-pressure (GPa) impedance measurements based on an indentation-induced local stress field
Résumé
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 (Delta 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 Delta V for O2- ion conduction in 10 mol\% Y2O3-doped zirconia at 500 degrees C was estimated to be 3.0 cm(3) mol(-1). Delta V increased with increasing temperatures from 500 to 600 degrees 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. (C) 2013 Elsevier B.V. All rights reserved.
Mots clés
No. 23686095)
Journal-ISO = Solid State Ion
Indentation
Activation volume
Fuel cell
YSZ
Hertzian theory
Keywords-Plus = YTTRIA-STABILIZED ZIRCONIA
MECHANICAL-PROPERTIES
IONIC-CONDUCTIVITY
INSTRUMENTED INDENTATION
ELECTRICAL-CONDUCTIVITY
DIELECTRIC-PROPERTIES
HYDROSTATIC-PRESSURE
ACTIVATION VOLUMES
ELASTIC-MODULUS
DEPENDENCE
Research-Areas = Chemistry
Physics
Web-of-Science-Categories = Chemistry
Physical
Condensed Matter
Author-Email = daiko.yusuke@nitech.ac.jp
Funding-Acknowledgement = Ministry of Education
Culture
Sports
Science and Technology (Japan) [23686095]
Funding-Text = This work was financially supported by the Ministry of Education
Science and Technology (Japan) (Grant-in-Aid for Young Scientists
Young A
No. 23686095).
Number-of-Cited-References = 51
Times-Cited = 0
Journal-ISO = Solid State Ion.
Doc-Delivery-Number = AA3VL
Unique-ID = ISI:000331022900002