Abstract
We have designed a portable pressure controller module to tune compression rates and maximum pressures attainable in a standard gas-membrane diamond anvil cell (DAC). During preliminary experiments, performed on zirconium (Zr) metal sample, pressure jumps of up to 80 GPa were systematically obtained in less than 0.2s (resulting in compression rate of few GPa/s up to more than 400 GPa/s). In-situ x-ray diffraction and electrical resistance measurements were performed simultaneously during this rapid pressure increase to provide the first time resolved data on α → ω → β structural evolution in Zr at high pressures. Direct control of compression rates and peak pressures, which can be held for prolonged time, allows for investigation of structural evolution and kinetics of structural phase transitions of materials under previously unexplored compression rate-pressure conditions that bridge traditional static and shock/dynamic experimental platforms.
Highlights
Over the last ~50 years, the advancement of diamond anvil cell (DAC) high pressure devices and associated techniques have occurred almost in parallel with evolution of new synchrotron radiation facilities
We will discuss some of our recent efforts in developing simultaneous high-pressure and variable-compression rate DAC capability, and subsequent work done in coupling this new capability with simultaneous in situ x-ray diffraction (XRD) and electrical resistance measurements for investigating structural stability of transition metal zirconium (Zr)
Our experiments evolved in the following manner: initial test measurements were performed to confirm the versatility of the response of gas-membrane, we made improvement to achieve higher compression rates, and coupling/synchronization of pressure control-XRD-electrical resistance measurements was achieved
Summary
Over the last ~50 years, the advancement of diamond anvil cell (DAC) high pressure devices and associated techniques have occurred almost in parallel with evolution of new synchrotron radiation facilities. The most advanced 3rd and 4th generation x-ray facilities continue to offer further increases in x-ray beam brightness, higher flux, improved on-sample beam focus, etc. These advancements offer new opportunities for high pressure (P) and temperature (T) DAC experiments, such as the ability to conduct time-resolved monochromatic x-ray diffraction (XRD) experiments [1]. We will discuss some of our recent efforts in developing simultaneous high-pressure and variable-compression rate DAC capability, and subsequent work done in coupling this new capability with simultaneous in situ XRD and electrical resistance measurements for investigating structural stability of transition metal zirconium (Zr).
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