A diamond anvil cell with resistive heating for high pressure and high temperature x-ray diffraction and absorption studies (original) (raw)
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A diamond gasket for the laser-heated diamond anvil cell
Review of Scientific Instruments, 2001
Advances in laser heating techniques with diamond anvil cells have enabled direct investigations of materials under extreme pressure-temperature conditions. The success of uniform heating to the maximum temperatures at megabar pressures relies critically on maximizing the gasket thickness which in turn depends upon the shear strength of the gasket. We have used diamond powder, the strongest possible material, to formulate a gasket for in situ x-ray diffraction with double-sided laser heating. The increase in gasket thickness allows increases in sample and insulator thickness, thereby improving the quality and pressure-temperature range of the measurement. We did not observe any pressure difference within 40 m of the center of the sample chamber and the temperature distribution across the sample itself is within Ϯ47 K. These improvements as well as the fact that the diamond gasket can allow the sample to remain in good condition after high P-T processing make it an extremely useful technique in diamond cell laser-heating experiments. As an example of the technique, we present in situ x-ray diffraction results for FeO to above 86 GPa and 3500 K.
Review of Scientific Instruments, 2020
A resistively-heated dynamic diamond anvil cell (RHdDAC) setup is presented. The setup enables the dynamic compression of samples at high temperatures by employing a piezoelectric actuator for pressure control and internal heaters for high temperature. The RHdDAC facilitates the precise control of compression rates and was tested in compression experiments at temperatures up to 1400 K and pressures of ∼130 GPa. The mechanical stability of metallic glass gaskets composed of a FeSiB alloy was examined under simultaneous high-pressure/high-temperature conditions. High-temperature dynamic compression experiments on H2O ice and (Mg, Fe)O ferropericlase were performed in combination with time-resolved x-ray diffraction measurements to characterize crystal structures and compression behaviors. The employment of high brilliance synchrotron radiation combined with two fast GaAs LAMBDA detectors available at the Extreme Conditions Beamline (P02.2) at PETRA III (DESY) facilitates the collectio...
Laser-heated diamond anvil cell at the advanced light source beamline 12.2. 2
2007
The laser heating system for the diamond anvil cell at endstation 2 of beamline 12.2.2 of the Advanced Light Source in Berkeley, CA has been constructed and is available for in-situ high-pressure hightemperature x-ray experiments. The endstation couples a high-brilliance synchrotron x-ray source with an industrial strength laser to heat and probe samples at high pressure in the diamond anvil cell. The system incorporates an 80 watt Nd:YLF (cw) laser operated in TEM01* mode. Double-sided heating is achieved by splitting the laser beam into 2 paths that are directed through the opposing diamond anvils. X-ray transparent mirrors steer the laser beams coaxial with the x-ray beam from the superconducting bending magnet (energy range 6-35 KeV) and direct the emitted light from the heated sample into two separate spectrometers for temperature measurement by spectroradiometry. Objective lenses focus the laser beam to a size of 25 micron diameter (FWHM) in the sample region. An x-ray spot size of 10 micron diameter (FWHM) has been achieved with the installation of a pair of focusing Kirkpatrick-Baez mirrors. A unique aperture configuration has produced an x-ray beam profile that has very low intensity in the tails. The main thrust of the program is aimed at producing in-situ high-pressure high-temperature x-ray diffraction data, but other modes of operation, such as x-ray imaging have been accomplished. Technical details of the experimental setup will be presented along with initial results.
BX90: A new diamond anvil cell design for X-ray diffraction and optical measurements
Review of Scientific Instruments, 2012
Oxy-acetylene driven laboratory scale shock tubes for studying blast wave effects Rev. Sci. Instrum. 83, 045111 (2012) Pressure distribution in a quasi-hydrostatic pressure medium: A finite element analysis J. Appl. Phys. 110, 113523 (2011) Multipurpose high-pressure high-temperature diamond-anvil cell with a novel high-precision guiding system and a dual-mode pressurization device Rev. Sci. Instrum. 82, 095108 A high temperature high pressure cell for quasielastic neutron scattering Rev. Sci. Instrum. 82, 083903 Accurate measurement of sample conductivity in a diamond anvil cell with axis symmetrical electrodes and finite difference calculation AIP Advances 1, 032116 Additional information on Rev. Sci. Instrum.
Review of Scientific Instruments, 2019
We present a new diamond anvil cell design, hereafter called mBX110, that combines both the advantages of a membrane and screws to generate high pressure. It enables studies at large-scale facilities for many synchrotron X-ray techniques and has the possibility to remotely control the pressure with the membrane as well as the use of the screws in the laboratory. It is fully compatible with various gas-loading systems as well as high/low temperature environments in the lab or at large scale facilities. The mBX110 possesses an opening angle of 85 ○ suitable for single-crystal diffraction or Brillouin spectroscopy and a large side opening of 110 ○ which can be used for X-ray inelastic techniques, such as X-ray Raman scattering spectroscopy, but also for X-ray emission, X-ray fluorescence, or X-ray absorption. An even larger opening of 150 ○ can be manufactured enabling X-ray imaging tomography. We report data obtained with the mBX110 on different beamlines with singlecrystal diffraction of stishovite up to 55 GPa, X-ray powder diffraction of rutile-GeO 2 and tungsten to 25 GPa and 280 GPa, respectively, X-Ray Raman spectra of the Si Ledge in silica to 95 GPa, and Fe Kβ X-ray emission spectra on a basalt glass to 17 GPa.
We describe a laser heated diamond anvil cell system at the GeoSoilEnviroCARS sector at the Advanced Photon Source. The system can be used for in situ x-ray measurements at simultaneously ultrahigh pressures ͑to Ͼ150 GPa͒ and ultrahigh temperatures ͑to Ͼ4000 K͒. Design goals of the laser heating system include generation of a large heating volume compared to the x-ray beam size, minimization of the sample temperature gradients both radially and axially in the diamond anvil cell, and maximization of heating stability. The system is based on double-sided laser heating technique and consists of two Nd:YLF lasers with one operating in TEM 00 mode and the other in TEM 01 * mode, optics to heat the sample from both sides, and two spectroradiometric systems for temperature measurements on both sides. When combined with an x-ray microbeam ͑3-10 m͒ technique, a temperature variation of less than 50 K can be achieved within an x-ray sampled region for longer than 10 min. The system has been used to obtain in situ structural data and high temperature equations of state on metals, oxides, and silicates to 3500 K and 160 GPa.
Efficient graphite ring heater suitable for diamond-anvil cells to 1300 K
The Review of scientific instruments, 2013
In order to generate homogeneous high temperatures at high pressures, a ring-shaped graphite heater has been developed to resistively heat diamond-anvil cell (DAC) samples up to 1300 K. By putting the heater in direct contact with the diamond anvils, this graphite heater design features the following advantages: (1) efficient heating: sample can be heated to 1300 K while the DAC body temperature remains less than 800 K, eliminating the requirement of a special alloy for the DAC; (2) compact design: the sample can be analyzed with in situ measurements, e.g., x-ray, optical, and electrical probes are possible. In particular, the side access of the heater allows for radial x-ray diffraction (XRD) measurements in addition to traditional axial XRD.
Portable laser-heating system for diamond anvil cells
Journal of Synchrotron Radiation, 2009
The diamond anvil cell (DAC) technique coupled with laser heating has become the most successful method for studying materials in the multimegabar pressure range at high temperatures. However, so far all DAC laser-heating systems have been stationary: they are linked either to certain equipment or to a beamline. Here, a portable laser-heating system for DACs has been developed which can be moved between various analytical facilities, including transfer from in-house to a synchrotron or between synchrotron beamlines. Application of the system is demonstrated in an example of nuclear inelastic scattering measurements of ferropericlase (Mg 0.88 Fe 0.12 )O and h.c.p.-Fe 0.9 Ni 0.1 alloy, and X-ray absorption near-edge spectroscopy of (Mg 0.85 Fe 0.15 )SiO 3 majorite at high pressures and temperatures. Our results indicate that sound velocities of h.c.p.-Fe 0.9 Ni 0.1 at pressures up to 50 GPa and high temperatures do not follow a linear relation with density.
Indian Journal of Physics, 2018
Laser-heated diamond anvil cell (LHDAC) technique is a unique and powerful experimental tool for studying the phase behaviour of materials at thermodynamic conditions comparable to the Earth's deep interior. Fine tuning of the two thermodynamic variables viz., pressure and temperature enables one to manipulate matter on an atomic scale leading to the synthesis of novel compounds or transformation of the properties of existing materials. In this article the details of an ytterbium doped fibre laser based LHDAC facility are presented. The advantages and excellent performance of the off-axis angular heating geometry is demonstrated through results of high pressure melting experiments on KBr up to 24 GPa and high temperature high pressure synthesis of c-Mo 2 N carried out by laser heating molybdenum metal and molecular nitrogen at 7 GPa and 2000 K in a Mao-Bell type diamond anvil cell.