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The diamond and its chemical stability
Release time:2013-11-07 Source:admin Reads:
The diamond relative products are very popular among young girls; it signals the sincerity and eternity. Many people choose it as the wedding gift or birthday presents. The conditions for diamond formation to happen in the mantle occur at considerable depth corresponding to the requirements of the jewelry cards. These depths are estimated between 140 and 190 kilometers though occasionally diamonds have crystallized at depths about 300 kilometers. The rate at which temperature changes with increasing depth into the Earth varies greatly in different parts of the Earth. The correct combination of temperature and pressure is only found in the thick, ancient, and stable parts of continental plates where regions of lithosphere known as cartons exist. Long residence in the cationic lithosphere allows diamond jewelry cards to grow larger. Diamond is the hardest known natural material on the scale of mineral hardness, where hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest). Diamond has a hardness of 10 (hardest) on this scale. Diamond's hardness has been known since antiquity, and is the source of its name. In particular, under oceanic plates the temperature rises more quickly with depth, beyond the range required for diamond formation at the depth required. Diamond hardness depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the direction. Therefore, whereas it might be possible to scratch some diamonds with other materials, such as boron nitride, the hardest diamonds can only be scratched by other diamonds and diamond aggregates jewelry cards. Other specialized applications also exist or are being developed, including use as semiconductors: some blue diamonds are natural semiconductors, in contrast to most diamonds, which are excellent electrical insulators. The conductivity and blue color originate from boron impurity. Boron substitutes for carbon atoms in the diamond lattice, donating a hole into the valence band.

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