Intelligent Anvils - advantages and limits
Abstract
Understanding the geological processes of the Earth and determining their related physical and chemical parameters is one of the fundamental tasks of experimental research in Earth Sciences. Such investigations are possible using for example diamond anvil cells (DAC)-based techniques which allow in situ measurements. However, depending of the parameters studied and depths investigated, it may be rather difficult or even impossible to accurately measure or determine parameters like pressure, temperature, electrical conductivity during DAC experiments. Zaitsev et al. (Phys. Stat. Sol., 185, 59-674, 2001) have shown the possibility to integrate conducting microstructures into the crystalline structure of the diamond anvils, offering the possibility to create active and passive electrical devices at any place below the sensor surface. These microstructures are produced by high temperature / high energy implantation at depths of 0-3 μm below the surface of the anvils. This technique offers the possibility to create heaters, temperature sensors, pressure sensors and maybe other types of sensor. Recent usability tests show that the integration of sensors and heaters on one and the same diamond anvil is useless because both types of devices interfere with each other. This is caused by extremely different operating voltages of both devices and the temperature driven surface conductivity of diamonds. We therefore present a new kind of the Burchard-Zaitsev-cell type (Burchard et al., Rev. Sci. Instr., 74, 1263-1266, 2003), modified for external heating but still able to operate implanted, intelligent diamond anvils. The electrical separation of heating devices and sensor devices opens the possibility to operate cells using intelligent anvils up to higher temperatures and therefore to measure parameters like temperature and pressure during a DAC experiment in situ. Calibration curves will be presented. The possibilities and limits of this technology will be discussed, more especially the combination of DACs equipped with modified anvils together with micro-analytical techniques.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2005
- Bibcode:
- 2005AGUFMMR13B..04B
- Keywords:
-
- 3924 High-pressure behavior;
- 3934 Optical;
- infrared;
- and Raman spectroscopy;
- 3954 X-ray;
- neutron;
- and electron spectroscopy and diffraction;
- 8412 Reactions and phase equilibria (1012;
- 3612);
- 8494 Instruments and techniques