Diamond meteorite9/19/2023 ![]() ![]() However, the phases have a wide region about this line where they can coexist. The equilibrium pressure varies linearly with temperature, between 1.7 GPa at 0 K and 12 GPa at 5000 K (the diamond/graphite/liquid triple point). The equilibrium pressure and temperature conditions for a transition between graphite and diamond are well established theoretically and experimentally. Theoretically predicted phase diagram of carbon It is chemically inert, not reacting with most corrosive substances, and has excellent biological compatibility. Its optical transparency extends from the far infrared to the deep ultraviolet and it has high optical dispersion. It has low adhesion and friction, and its coefficient of thermal expansion is extremely low. It has the highest thermal conductivity and the highest sound velocity. ĭiamonds have been adopted for many uses because of the material's exceptional physical characteristics. However, the stronger bonds make graphite less flammable. Thus, graphite is much softer than diamond. In graphite, the bonds between nearest neighbors are even stronger, but the bonds between parallel adjacent planes are weak, so the planes easily slip past each other. It also has a high density, ranging from 3150 to 3530 kilograms per cubic metre (over three times the density of water) in natural diamonds and 3520 kg/m 3 in pure diamond. Tetrahedra are rigid, the bonds are strong, and of all known substances diamond has the greatest number of atoms per unit volume, which is why it is both the hardest and the least compressible. In diamond they are sp 3 and the atoms form tetrahedra with each bound to four nearest neighbors. In graphite the bonds are sp 2 orbital hybrids and the atoms form in planes, with each bound to three nearest neighbors 120 degrees apart. The two most common allotropes of pure carbon are diamond and graphite. Solid carbon comes in different forms known as allotropes depending on the type of chemical bond. Main article: Material properties of diamondĭiamond is a solid form of pure carbon with its atoms arranged in a crystal. Natural, synthetic and imitation diamonds are most commonly distinguished using optical techniques or thermal conductivity measurements. Imitation diamonds can also be made out of materials such as cubic zirconia and silicon carbide. Synthetic diamonds can be grown from high-purity carbon under high pressures and temperatures or from hydrocarbon gases by chemical vapor deposition (CVD). Much more recently (hundreds to tens of million years ago), they were carried to the surface in volcanic eruptions and deposited in igneous rocks known as kimberlites and lamproites. Under high pressure and temperature, carbon-containing fluids dissolved various minerals and replaced them with diamonds. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle, although a few have come from as deep as 800 kilometres (500 mi). Most natural diamonds have ages between 1 billion and 3.5 billion years. Diamond also has a very high refractive index and a relatively high optical dispersion. Small numbers of defects or impurities (about one per million of lattice atoms) color diamond blue (boron), yellow (nitrogen), brown (defects), green (radiation exposure), purple, pink, orange, or red. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth.īecause the arrangement of atoms in diamond is extremely rigid, few types of impurity can contaminate it (two exceptions are boron and nitrogen). Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions. Transparent to subtransparent to translucentĭiamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Less often blue, green, black, translucent white, pink, violet, orange, purple, and red. Typically yellow, brown, or gray to colorless. Its lustrous faces also indicate that this crystal is from a primary deposit. The slightly misshapen octahedral shape of this rough diamond crystal in matrix is typical of the mineral. ![]()
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