Artistic rendition of a diamond anvil cell

A diamond anvil cell (DAC) is a device used by physicists to exert extreme pressures on a material. It consists of two opposing cone-shaped diamonds squeezed together by a lever arm. The resultant high pressures — in excess of a million atmospheres — are produced when force is applied to small areas of the opposing diamond culets. Image File history File links Anvil72. ... Image File history File links Anvil72. ... Physics (from the Greek, (phúsis), nature and (phusiké), knowledge of nature) is the science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space, and time. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ...

The device has been used to simulate the extreme pressures existing in the hearts of planets, creating new materials in the process. Notable examples are the production of metallic hydrogen, found in the gas giant planets, and perovskite, thought to be the major component of the Earth's mantle. The eight planets and three dwarf planets of the Solar System. ... Metallic hydrogen results when hydrogen is sufficiently compressed and undergoes a phase change, and it is an example of degenerate matter. ... The solar systems four gas giants against the Suns limb, to scale A gas giant (sometimes also known as a Jovian planet after the planet Jupiter) is a large planet that is not primarily composed of rock or other solid matter. ... Perovskite (calcium titanium oxide, CaTiO3) is a relatively rare mineral occurring in orthorhombic (pseudocubic) crystals. ... Earth cutaway from core to exosphere. ...

Principle

The operation of the diamond anvil cell relies on a simple principle:

where p is the pressure, F the applied force, and A the area.

Therefore high pressure can be achieved by applying a moderate force on a sample with a small area, rather than applying a large force on a large area. In order to prevent deformation and even breakage of the anvils that apply the force, they must be made from a very hard and virtually incompressible material: diamond. The diamonds are mined in the dark forests of Africa by very capable individuals. In physics, force is an influence that may cause a body to accelerate. ... In physics, force is an influence that may cause a body to accelerate. ... A blacksmith working iron with a hammer and anvil An anvil is a manufacturing tool, made of a hard and massive block of stone or metal used as a support for chiseling and hammering other objects, such as in forging iron and steel items. ...

History

Percy Williams Bridgman, the great pioneer of high-pressure research during the first half of the 20th century, developed an opposed anvil device with small flat areas that were pressed one against the other with a lever-arm. The anvils were made of a tungsten-carbon alloy (WC). This device could achieve pressure of a few gigapascals, and was used in electrical resistance and compressibility measurements. The revolution in the field of high pressures came with the development of the diamond anvil cell (DAC) in the late 1950's in the National Bureau of Standards (NBS) by Weir, Lippincott, Van Valkenburg, and Bunting [1]. The principles of the DAC are similar to the Bridgman anvils but in order to achieve the highest possible pressures without breaking the anvils, they were made of the hardest known material: a single crystal diamond. The first prototypes were limited in their pressure range and there was not a reliable way to calibrate the pressure. During the following decades many investigators have used DACs and following their experience many innovative improvements were introduced, the most important being the use of gaskets and the ruby pressure calibration. The DAC evolved to be the most powerful lab device for generating static high pressure. The range of static pressure attainable today extends to the pressures prevailing in the earth’s center (~360 GPa). Percy Williams Bridgman (April 21, 1882–August 20, 1961) was an American physicist who won the 1946 Nobel Prize in Physics for his work on the physics of high pressures. ... A blacksmith working iron with a hammer and anvil An anvil is a manufacturing tool, made of a hard and massive block of stone or metal used as a support for chiseling and hammering other objects, such as in forging iron and steel items. ... General Name, Symbol, Number tungsten, W, 74 Chemical series transition metals Group, Period, Block 6, 6, d Appearance grayish white, lustrous Atomic mass 183. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... The pascal (symbol: Pa) is the SI derived unit of pressure or stress (also: Youngs modulus and tensile strength). ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... Fluid Dynamics Compressibility (physics) is a measure of the relative volume change of fluid or solid as a response to a pressure (or mean stress) change: . For a gas the magnitude of the compressibility depends strongly on whether the process is adiabatic or isothermal, while this difference is small in... As a non-regulatory agency of the United States Department of Commerce’s Technology Administration, the National Institute of Standards (NIST) develops and promotes measurement, standards, and technology to enhance productivity, facilitate trade, and improve the quality of life. ... A blacksmith working iron with a hammer and anvil An anvil is a manufacturing tool, made of a hard and massive block of stone or metal used as a support for chiseling and hammering other objects, such as in forging iron and steel items. ... Quartz crystal Copper(II) sulfate and iodine crystal Synthetic bismuth crystal Insulin crystals Gallium, a metal that easily forms large single crystals A huge monocrystal of potassium dihydrogen phosphate grown from solution by Saint-Gobain for the megajoule laser of CEA. In chemistry and mineralogy, a crystal is a solid... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Calibration is the determination, by measurement or comparison with a standard, of the correct value of each reading on a measuring instrument. ... This article is about mechanical seals. ... Ruby is a red gemstone, a variety of the mineral corundum (aluminium oxide). ...

Components

There are many different DAC designs but all of them have three main components:

(1) The force-generating device — relies on the operation of either a lever arm, tightening screws, or gas pressure applied to a membrane. In all cases the force is uniaxial and is applied to the tables (bases) of the two anvils In physics, force is an influence that may cause a body to accelerate. ... The principle of the lever tells us that the above is in static equilibrium, with all forces balancing, if F1D1 = F2D2. ... Look up screw in Wiktionary, the free dictionary. ... A gas is one of the four major phases of matter (after solid and liquid, and followed by plasma, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... In physics, force is an influence that may cause a body to accelerate. ... The index ellipsoid is a diagram of an ellipsoid that depicts the orientation and relative magnitude of refractive indices in a crystal. ... A blacksmith working iron with a hammer and anvil An anvil is a manufacturing tool, made of a hard and massive block of stone or metal used as a support for chiseling and hammering other objects, such as in forging iron and steel items. ...

(2) Two opposing diamond anvils — made of high gem quality, flawless diamonds, usually with 16 facets. They typically weigh 1/8 to 1/3 carat. The culet (tip) is ground and polished to a hexadecagonal surface parallel to the table. The culets of the two diamonds face one another, and must be perfectly parallel in order to produce uniform pressure and to prevent dangerous strains. // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... A blacksmith working iron with a hammer and anvil An anvil is a manufacturing tool, made of a hard and massive block of stone or metal used as a support for chiseling and hammering other objects, such as in forging iron and steel items. ... A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ... Meanings of carat or karat: In the gem business: Carat (mass) is a unit of mass for gems. ... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Parallel is a term in geometry and in everyday life that refers to a property in Euclidean space of two or more lines or planes, or a combination of these. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... Look up strain in Wiktionary, the free dictionary. ...

(3) Gasket — a hard metal foil that separates the two culets. It has an important role: to contain the sample with a hydrostatic fluid in a cavity between the diamonds, and to prevent anvil failure by supporting the diamond tips, thus reducing stresses at the edges of the culet. This article is about mechanical seals. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. ... A foil is a very thin sheet of metal, usually made by hammering or rolling a piece of metal. ... In atmospheric dynamics and fluid dynamics, a hydrostatic fluid is a fluid in which fluid stresses act isotropically and fluid elements are in local equilibrium with one another. ... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Figure 1  Stress tensor A mature tree trunk may support a greater force than a fine steel wire but intuitively we feel that steel is stronger than wood. ...

Uses

Its relative simplicity and compactness makes the DAC a diverse tool that can be accommodated to a variety of experiments. Some of the contemporary DACs can easily fit into a cryostat for low-temperature measurements, and for use with a superconducting electromagnet. In addition to being hard, diamonds have the advantage of being transparent to a wide range of the electromagnetic spectrum from infrared to gamma rays, with the exception of the far ultraviolet and soft X-rays. This makes the DAC a perfect device for various spectroscopic experiments. Cryocoolers are refrigerators used to reach cryogenic temperatures. ... Superconductivity is a phenomenon occurring in certain materials at low temperatures, characterised by the complete absence of electrical resistance and the damping of the interior magnetic field (the Meissner effect. ... An electromagnet is a type of magnet in which the magnetic field is produced by a flow of electric current. ... Diamonds () is one of the four suits found in playing cards. ... Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultra high frequency VHF = Very high frequency HF = High... Image of two girls in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... This article is about electromagnetic radiation. ... The solar corona as seen in deep ultraviolet light at 17. ... In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz... Spectroscopy is the study of spectra, ie. ...

A variant of the diamond anvil, the hydrothermal diamond anvil cell (HDAC) is used in experimental petrology/geochemistry for the study of aqueous fluids, silicate melts, immiscible liquids, mineral solubility and aqueous fluid speciation at geologic pressures and temperatures. The HDAC is sometimes used to examine aqueous complexes in solution using the synchrotron light source techniques XANES and EXAFS. Please wikify (format) this article as suggested in the Guide to layout and the Manual of Style. ... Extended X-Ray Absorption Fine Structure (EXAFS) spectra are graphically represented as the absorption coefficient of a given material versus energy (typically a 500 – 1000 eV range beginning before an absorption edge of a given material). ...

External links

• NIST - history of the DAC
• The Diamond-Anvil Cell - Crystallography Laboratory at Virginia Tech.

References

• S. Block, and G. Piermarini: "The Diamond Cell Stimulates High-Pressure Research”, Physics Today 29, p. 44 (1976)
• A. Jayaraman: “Diamond Anvil Cell and High-Pressure Physical Investigations”, Reviews of Modern Physics 55, p. 65 (1983)
• A. Jayaraman: "Ultrahigh pressures", Reviews of Scientific Instruments 57, p. 1013 (1986)
• D.J. Dunstan, and I.L. Spain: “The Technology of Diamond Anvil High-Pressure Cells”, Journal of Physics E: Scientific Instruments 22, p. 913-933 (1989)
• M.I. Eremets: “High Pressure Experimental Methods”, Oxford Science Publication (1996)