Impedance Spectroscopy at Super High Pressures

Application of the AC Impedance Spectroscopy at High Pressures: Electrophysical Properties of Sulfur

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.208-209.295 ◽

2002 ◽

Vol 208-209 ◽

pp. 295-298 ◽

Cited By ~ 7

Author(s):

Yu.A. Kandrina ◽

Alexey N. Babushkin ◽

S.N. Shkerin ◽

Yana Volkova

Keyword(s):

Impedance Spectroscopy ◽

High Pressures ◽

Ac Impedance ◽

Electrophysical Properties ◽

Ac Impedance Spectroscopy

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Crack Propagation and Detection in PZT-Multilayer Ceramics

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/cicmt-2011-tp21 ◽

2011 ◽

Vol 2011 (CICMT) ◽

pp. 000091-000098

Author(s):

Tobias Kühnlein ◽

Silvan Poller ◽

Martin Rauscher ◽

Alexander Klonczynski

Keyword(s):

Impedance Spectroscopy ◽

Crack Propagation ◽

Fracture Strength ◽

High Pressures ◽

Mechanical Load ◽

Matrix Cracking ◽

Extreme Condition ◽

Measurement Tool ◽

Electrode Potentials ◽

Resonance Frequencies

Piezo multilayer ceramics are increasingly used under extreme condition such as high pressures in engine injection systems. The mechanical stability and reliability of the ceramic multilayer is of major importance for proper operation. Critical functional defects are caused by material fracture and flaw extension in the device. The flaw propagation in PZT-multilayer ceramics under mechanical load was examined using impedance spectroscopy and three-point-bending studies. Initial flaws were generated by applying a sinus ac-field on the specimens. The cracks were successively promoted and after the release of the external mechanical load the impedance spectroscopy was conducted. As a measure for flaw extension, the shift in the resonance frequencies and the sub-resonance height of the impedance spectroscopy was used. A functional dependence of the resonance frequency and the phase shift on the crack length was found. The crack propagation was studied on flaws starting at the positive and negative electrode, respectively. The maximum fracture strength as well as the crack path depends on the electrode potentials. The variation in the fracture strength was caused by the different observed fracture mode: interface cracking, matrix-cracking and a combination of both. The morphology of the fracture faces was ascribed to an anisotropic behaviour, which is created by the sample processing, e.g. the poling process. A modified poling procedure with a lower poling temperature was analysed, which yielded a reduction of the anisotropy of the electrode strength. Impedance spectroscopy was found as a reliable measurement tool for automated flaw detection in PZT-multilayer ceramics.

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Study on the High-Pressure Behavior of Goethite up to 32 GPa Using X-Ray Diffraction, Raman, and Electrical Impedance Spectroscopy

Minerals ◽

10.3390/min10020099 ◽

2020 ◽

Vol 10 (2) ◽

pp. 99 ◽

Cited By ~ 1

Author(s):

Ruilian Tang ◽

Jiuhua Chen ◽

Qiaoshi Zeng ◽

Yan Li ◽

Xue Liang ◽

...

Keyword(s):

Phase Transition ◽

High Pressure ◽

Impedance Spectroscopy ◽

Electrical Impedance ◽

High Pressures ◽

Structural Phase ◽

Second Order ◽

Electrical Impedance Spectroscopy ◽

X Ray Diffraction ◽

X Ray

Goethite is a major iron-bearing sedimentary mineral on Earth. In this study, we conducted in situ high-pressure x-ray diffraction, Raman, and electrical impedance spectroscopy measurements of goethite using a diamond anvil cell (DAC) at room temperature and high pressures up to 32 GPa. We observed feature changes in both the Raman spectra and electrical resistance at about 5 and 11 GPa. However, the x-ray diffraction patterns show no structural phase transition in the entire pressure range of the study. The derived pressure-volume (P-V) data show a smooth compression curve with no clear evidence of any second-order phase transition. Fitting the volumetric data to the second-order Birch–Murnaghan equation of state yields V0 = 138.9 ± 0.5 Å3 and K0 = 126 ± 5 GPa.

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Electrical conductivity of Alm82Py15Grs3 almandine-rich garnet determined by impedance spectroscopy at high temperatures and high pressures

Tectonophysics ◽

10.1016/j.tecto.2013.07.004 ◽

2013 ◽

Vol 608 ◽

pp. 1086-1093 ◽

Cited By ~ 16

Author(s):

Lidong Dai ◽

Heping Li ◽

Haiying Hu ◽

Jianjun Jiang ◽

Keshi Hui ◽

...

Keyword(s):

Electrical Conductivity ◽

Impedance Spectroscopy ◽

High Temperatures ◽

High Pressures

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Impedance spectroscopy for in situ and real-time observations of the effects of hydrogen on nitrile butadiene rubber polymer under high pressure

Scientific Reports ◽

10.1038/s41598-019-49692-y ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 1

Author(s):

Jae Kap Jung ◽

Sang Koo Jeon ◽

Kyu-Tae Kim ◽

Chang Hoon Lee ◽

Un Bong Baek ◽

...

Keyword(s):

High Pressure ◽

Impedance Spectroscopy ◽

Real Time ◽

High Pressures ◽

Hydrogen Gas ◽

Physicochemical Interaction ◽

Butadiene Rubber ◽

Current Conservation ◽

Nitrile Butadiene Rubber

Abstract Nondestructive impedance spectroscopy (IS) was developed and demonstrated to detect the effects of hydrogen on nitrile butadiene rubber exposed to hydrogen gas (H2) at high pressures up to 10 MPa. IS was applied to obtain an in situ and real-time quantification of H2 penetration into and its desorption out of rubber under high pressure. The diffusion coefficients of H2 were also obtained from the time evolution of the capacitance, which were compared with those obtained by thermal desorption gas analysis. The in situ measurements of the capacitance and the dissipation factor under various pressures during cyclic stepwise pressurization and decompression demonstrated the diffusion behaviour of H2, the phase of the rubber under high pressure, the transport properties of H2 gas, and the physicochemical interaction between H2 and the rubber. These phenomena were supported by a COMSOL simulation based on the electric current conservation equation and scanning electron microscopy (SEM) observations.

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