Alternating current impedance spectroscopy measurement under high pressure.
Chunyuan He1, Bingguo Liu, Ming Li
1College of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, China.
The Review of Scientific Instruments
|February 2, 2011
Summary
This study presents a novel microcircuit for high-pressure impedance spectroscopy using diamond anvil cells. The developed apparatus accurately measures the electrical properties of materials like cadmium sulfide under extreme conditions.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Electrochemistry
Background:
- High-pressure measurements are crucial for understanding material properties and phase transitions.
- Traditional impedance spectroscopy methods face challenges under extreme pressures.
- Developing specialized apparatus is necessary for accurate high-pressure electrical characterization.
Purpose of the Study:
- To design and fabricate a microcircuit for alternating current impedance spectroscopy under high pressure.
- To evaluate and correct for parasitic effects in the measurement system.
- To investigate the pressure-dependent electrical properties of cadmium sulfide (CdS).
Main Methods:
- Fabrication of a microcircuit on a diamond anvil cell using sputtered molybdenum electrodes.
- Alternating current impedance spectroscopy under varying high pressures.
- Empty cell and short circuit tests to characterize parasitic impedance and inductance.
- Measurement of the impedance of II-VI group cadmium sulfide (CdS).
Main Results:
- The microcircuit enabled stable electrode contact and reduced electrode effects.
- Parasitic capacitive impedance and wire inductance were quantified and methods for their correction were established.
- The pressure dependence of grain interior conductance in CdS was successfully obtained.
- Observed phase transitions in CdS under high pressure matched single crystal results.
Conclusions:
- The developed diamond anvil cell microcircuit is effective for high-pressure impedance spectroscopy.
- The apparatus allows for accurate characterization of material electrical properties under pressure.
- The findings confirm the consistency of CdS phase transitions under pressure across different measurement techniques.
Related Concept Videos
01:19Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
01:19Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then passed on to...